| Subject | Date Asked |
|
| Carnot Engine | 11/18/2009 |
Q: Kovalcin, I am a student at Laurentian University studying Geology. I am in first year and in ...
A: If 30% of the heat is dumped into the cold reservoir the efficiency of the process is 70% rather ...
|
| radioactivity | 11/17/2009 |
Q: In the process of beta decay a proton transforms into a neutron according to p-----> n + ...
A: The energy of the incoming proton is converted into the mass of the resulting products. Mass is NOT ...
|
| Circular Motion and Gravitational Forces | 11/16/2009 |
Q: Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people ...
A: Question 1 is a relative velocity question. Just add the velocity of you to the velocity of the bus! ...
|
| Physics | 11/15/2009 |
Q: Sorry if this question has been asked before but i can't find it on the sheet. Someone jumps a hole ...
A: All 2 dimensional kinematics problems can be solved in the same way. There are 6 kinematics ...
|
| Circular Motion and Gravitational Forces | 11/14/2009 |
Q: Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people ...
A: a) To determine the velocity of someone at the equator use the definition of velocity: v=dD/dT ...
|
| physics | 11/14/2009 |
Q: please give me ideas for making working model on any topic of physics like light, electricity, ...
A: One of the most fun projects is to make a "Rube Goldberg" machine. [Do a Google search on this ...
|
| specific heat capacity | 11/13/2009 |
Q: if you wish to warm 100 kg of water by 18 degrees celsius for your bath, how much heat is required? ...
A: The heat needed to change the temperature of a substance is given by: dQ=m*c*dt where dQ is the ...
|
| observation | 11/12/2009 |
Q: I've been reading about the quantum and I know if you observe (interact) with what you are ...
A: A full discussion would be rather lengthy but the fact is that experiments have been run where the ...
|
| electricity | 11/11/2009 |
Q: explain why a battery of ten dry lechlanche cells each of emf 1.5volts cannot be used in place of a ...
A: Electric power requires BOTH current and voltage. The current is the carrier of energy while the ...
|
| What's the principle that correlates diameter of a tube and its inner liquid pressure value? | 11/10/2009 |
Q: What is the name of the Principle that states that for a fixed flux of liquid through a tube, the ...
A: What you are looking for it the "Law of Continuity". Since a typical fluid is matter, and since ...
|
| Speed, time and and distance | 11/7/2009 |
Q: can you please give me all the formulas for the 9th grade? and it should be about speed, time and ...
A: First of all there is no such thing as "all the formulas for the 9th grade"! However, if you a ...
|
| Speed | 11/6/2009 |
Q: The passengers in a roller coaster car feel 40% heavier than their true weight as the car goes ...
A: Because this roller coaster is moving in a circular path Newton's 2nd Law applies: SF=m*a where SF ...
|
| Tension and angular velocity | 11/5/2009 |
Q: A conical pendulum is formed by attaching a 420 g ball to a 1.0 m long string, then allowing the ...
A: Because the mass of this pendulum is moving in a circular path it is accelerating and therefore its ...
|
| Pulleys | 11/5/2009 |
Q: This is a question I have often wondered as I do a lot of sailing. When sailing we use block and ...
A: In principle it is only the number of pulleys that matters. However, that completely ignores the ...
|
| Momentum | 11/4/2009 |
Q: If two particles have equal kinetic energies, are their momenta necessarily equal? Sir Please ...
A: Not at all! Kinetic energy is given by: KE=1/2*m*v^2 while momentum is given by: p=m*v Suppose that ...
|
| physics | 11/2/2009 |
Q: A figure skater during her finale can increase her rotation rate from an initial rate of 1.0 rev ...
A: This is a problem of angular momentum conservation where: I1*w1=I2*w2 where I is the moment of ...
|
| physics | 11/2/2009 |
Q: A 6.0 m diameter merry-go-round is rotating freely with an angular velocity of 0.80 rad/s. Its total ...
A: In an isolated system angular momentum will be conserved: I1*w1=I2*w2 where I is the moment of ...
|
| Optics | 11/1/2009 |
Q: Respected Sir I am Mukul Of grade 12 Why does the wavelength of light change but the frequency ...
A: When two mediums meet they form an interface. When a wave traveling in one medium encounters a ...
|
| theory | 11/1/2009 |
Q: I just finished reading about Multiverse theory (altervative universes) and I don't understand if a ...
A: Many experimental physicists would agree with your analysis. There doesn't seem to be any way, at ...
|
| emf of a solenoid | 10/31/2009 |
Q: Imagine that you want to wind a solenoid that would be able to keep a 10-ohm light bulb lighted for ...
A: The EMF generated by a changing magnetic flux is given according to Faraday's Law: EMF=-N*dF/dt ...
|
| physics | 10/31/2009 |
Q: A 2.4 kg block slides down a 25° inclined plane with constant acceleration. The block starts from ...
A: This is a straightforward kinematics problem with 6 unknowns and 2 equations. Any time you can ...
|
| physics | 10/30/2009 |
Q: upper layers of water in a deep well are cool but those in a pond are warm and the lower layers of ...
A: First of all, the assumptions made in this question are not universal. As for the well, if it is ...
|
| Physics | 10/29/2009 |
Q: Sir, I want to know the procedure of how I can convert a Galvanometer into volmeter.
A: To convert a Galvanometer into a Voltmeter you will have to place an appropriately valued resistor ...
|
| physics | 10/28/2009 |
Q: A mallet consists of a uniform cylindrical head of mass 3.00 kg and a diameter 0.0800 m mounted on a ...
A: What you are looking for here is the center of mass of the mallet. To find the center of mass let's ...
|
| can you please help me?? physics is my main struggle! | 10/28/2009 |
Q: 1.Identify a sport and changing weather conditions that probably would cause an athlete to want to ...
A: 1. Soccer? Think about it. It is not that hard. 2. Skiing? Try looking it up online [or maybe look ...
|
| Mouse trap car | 10/27/2009 |
Q: I have to build a mouse trap car for physics. I've seen simple structures on the internet, but I ...
A: Making the car go faster isn't the answer! Since the energy contained within the mouse trap is ...
|
| Physics:Conservation of energy | 10/26/2009 |
Q: 1) AN older 925kg car without anti-lock brakes shows skid marks 15.3m long on wet pavement. the skid ...
A: 1. Assuming that the coefficient of sliding friction between the tires of the car and a wet road is ...
|
| How does sound travel | 10/26/2009 |
Q: My question is how does sound travel through the air? Is it like a radio wave? And is sound inside a ...
A: Sound and light are entirely different. Light can travel through a vacuum while sound REQUIRES a ...
|
| Tension | 10/23/2009 |
Q: A 20 kg loudspeaker is suspended 1.4 m below the ceiling by two 3.0 m long cables that angle outward ...
A: This system is clearly at equilibrium since it is not accelerating. Therefore, opposite forces must ...
|
| physics | 10/22/2009 |
Q: The blades in a blender rotate at a rate of 7000 rpm. When the motor is turned off during operation, ...
A: The key to solving a rotational problem like this is just to pretend that the problem is linear! In ...
|
| physics | 10/22/2009 |
Q: A grinding wheel 0.54 m in diameter rotates at 2300 rpm. (a) Calculate its angular velocity in ...
A: To answer the first question use dimensional analysis [also called unit cancellation]: w=2300 ...
|
| physics | 10/21/2009 |
Q: A spring (80 ) has an equilibrium length of 1.00 . The spring is compressed to a length of 0.50 ...
A: All of these problems can be solved using the idea of energy conservation. 1. In this first problem ...
|
| physics | 10/20/2009 |
Q: A skier coasts down a very smooth, 10-m-high slope. If the speed of the skier on the top of the ...
A: These problems are all energy conservation problems! #1. The kinetic energy and gravitational energy ...
|
| physics | 10/20/2009 |
Q: 1.) A ditch 2.5 m wide crosses a trail bike path. An upward incline of 15o has been built up on the ...
A: If you looked at the previous 2 question I answered you would see: "Almost all two dimensional ...
|
| Physics motion | 10/19/2009 |
Q: Divers in Acapulco dive from a cliff that is 64 m high. If the rocks below the cliff extend ...
A: Almost all two dimensional kinematics can be done in the same way! Uniform acceleration involves six ...
|
| Physics motion | 10/19/2009 |
Q: An airplane traveling 1010 m above the ocean at 120 km/h is going to drop a box of supplies to ...
A: This is very much like the last question you asked! "Almost all two dimensional kinematics can be ...
|
| physics | 10/18/2009 |
Q: Explain the difference between the everyday use of each term below and the way it is used in ...
A: A) In everyday vernacular the word "acceleration" has come to mean "speed up". In physics, however, ...
|
| First year University Physics | 10/17/2009 |
Q: Mr. Kovalcin, I'm doing review for a test I have soon and one of the questions I have is pretty ...
A: Unfortunately you are on the wrong path! Your attempted solution implies that energy will be ...
|
| Physics - Calorimetry Lab | 10/16/2009 |
Q: Mr. Kovalcin, I have a Physics lab in a little while and one of the introduction questions asks what ...
A: Your answer seems to be on the right track. The point of the calorimeter is that in an isolated ...
|
| Torque and Rotational Dynamics | 10/16/2009 |
Q: A 1.8 kg, 40 cm diameter disk is spinning at 340 rpm. How much friction force must the brake apply ...
A: There are two different ways to approach this problem: energy conservation or kinematics. In either ...
|
| Sliding-Rolling Friction | 10/15/2009 |
Q: If a ball is exhibiting non-pure rolling motion (i.e. sliding and spinning at the same time) in a ...
A: Suppose that you have a bowling ball spinning clockwise when you gently release in onto a horizontal ...
|
| Physics | 10/13/2009 |
Q: Starting from rest, a 92-kg firefighter slides down a fire pole. The average frictional force ...
A: This problem is a combination of Newton's 2nd Law problem and a kinematics problem. First applying ...
|
| Physics | 10/12/2009 |
Q: Kovalcin, I have a question that I am having a hard time figuring out. ---- An elevator whose mass ...
A: In general there are only two equations needed to solve almost any one dimensional kinematics ...
|
| Physics | 10/11/2009 |
Q: Kovalcin, I have a question that I am having a hard time figuring out. ---- An elevator whose mass ...
A: Your are correct in that Power = Force x Velocity, but your answer is much too low! You must have ...
|
| PHYSICS | 10/11/2009 |
Q: A HORIZONTAL FORCE=35NIS REQUIRED TO SLIDE A SWORD WEIGHING280KGF OVER A FLAT SURFACE CALCULATE ...
A: Since the coefficient of friction mu is equal to the ratio if the force needed to overcome that ...
|
| AP Physics | 10/10/2009 |
Q: two forces are applied to a car in an effort to move it. f1=450N@10degrees f2=400N@30degrees. ...
A: The most reliable way to add two vector quantities is to use the i & j component method. In this ...
|
| Physics Question | 10/9/2009 |
Q: A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal ...
A: The coefficient of friction is defined to be the ratio of the frictional force to the normal force ...
|
| velocity and gravity | 10/9/2009 |
Q: My son is in freshman physics in high school. I didn't take physics "way back" when I was in ...
A: The easy way to look at this is to use energy conservation! Since the ball is thrown with the same ...
|
| Earth's poles | 10/8/2009 |
Q: I read in a magazine that the Earth's Magnetic poles "swtiches" polarities and have done so several ...
A: As far as we know the Earth's magnetic field is caused by the fact that the Earth has an Iron-Nickel ...
|
| circular motion | 10/8/2009 |
Q: The centers of a 9.0 lead ball and a 60 lead ball are separated by 11 . What gravitational force ...
A: Assume that the m1=21kg sphere is at the origin, the m2=12 kg sphere is on the x axis at L=19.0cm ...
|
| heat flow through skin | 10/6/2009 |
Q: I saw your answer to the problem of how much heat flows through the skin of a human with ...
A: This is assuming that you have no hair covering, no clothes, minimal fat coverage, no surrounding ...
|
| Physics | 10/6/2009 |
Q: A Cessna 150 aircraft has a lift-off speed of approximately 125 km/h What minimum constant ...
A: All kinematics problems involve 6 variables [do, df, Vo, Vf, a and t] and two equations: ...
|
| conservation of energy | 10/5/2009 |
Q: This may or may not be your type of question, but I don't know any other field to submit it to. ...
A: The amount of energy needed to evaporate the water content of the clothes is the same in either ...
|
| Phsyics | 10/4/2009 |
Q: In the high jump, the kinetic energy of an athlete is transformed into gravitational potential ...
A: As in the previous question energy must be conserved. In this case the initial kinetic energy must ...
|
| Phsyics | 10/4/2009 |
Q: Suppose the roller coaster in Fig. 6-41 (h1 = 34 m, h2 = 13 m, h3 = 20) passes point 1 with a speed ...
A: Assuming that this roller coaster is heading downhill [since there is no diagram] the total kinetic ...
|
| Block and ramp variables | 10/3/2009 |
Q: A spring pushes a block up a ramp with a frictional surface. How high can the block go before it ...
A: The total energy stored in the system at the beginning must all be accounted for so that the total ...
|
| Physics | 10/2/2009 |
Q: 3.) A 40kg mass is held on an inclined plane of 30 degrees above the horizontal. If the surface is ...
A: If there is no friction, the force needed to hold the 40 kg mass in place will be the gravitational ...
|
| physics | 10/1/2009 |
Q: Suppose the rope is 50 meters long, and that a sideways force of 300 N is required to displace the ...
A: Since force is a vector quantity the force components must be directly proportional to the distances ...
|
| please help | 9/30/2009 |
Q: ,i was wondering if u could help me with this, i need the general equation of motion. a robot is ...
A: Assuming that the wall is vertical, the downward gravitational force Fg on the robot needs to be ...
|
| rate of acceleration | 9/29/2009 |
Q: Question on rate of acceration concerning an combustion engine. displacement of 10 cm Piston moves ...
A: Assuming that this piston's motion is simple harmonic: a=A*w^2 The maximum acceleration a will be ...
|
| physics stumper i need help | 9/28/2009 |
Q: Two billiard balls having the same mass and speed roll toward each other. What is their combined ...
A: Their combined momentum after will be exactly the same as their combined momentum before [if you ...
|
| physics | 9/24/2009 |
Q: A commuter train was traveling into the train station. It failed to stop on time and crashed into ...
A: The passengers would NOT fly backwards! Remember that the train is moving forward and so are the ...
|
| physics | 9/23/2009 |
Q: my question is: If two snowcats tow a housing unit to a new location, the sum of the forces FA and ...
A: The components of the two forces perpendicular to L must be equal: Fa*sin(50)=Fb*sin(30) solve for ...
|
| physics | 9/23/2009 |
Q: what's the connection between speed, friction, and radius of the curve when turning?
A: Assuming that the curve is flat [that is, the road bed is horizontal]. The force needed keep ...
|
| Physics | 9/22/2009 |
Q: A ball is dropped into a lake 5 meters above water. It enters the water and sinks to the bottom with ...
A: Aside from the fact that this would never happen! First calculate the velocity of the ball after it ...
|
| Pumping with Compressed Air | 9/21/2009 |
Q: James, I am trying to work out why an air displacement pump delivering to a 50 metre head through 2 ...
A: Several things! First, the inertia of the water down not matter unless you are accelerating the ...
|
| General Physics | 9/21/2009 |
Q: Respected sir I am a student of grade 12 Capacitive reactance is inversely proportional to the ...
A: As charge flows onto the plates of a capacitor the potential difference across the capacitor builds ...
|
| Electromagnetics | 9/20/2009 |
Q: Respected Sir I am student of class 12, Is there any condition or an example in which emf is induced ...
A: Sure! Just because an EMF exists no way implies that a current exists. Current will only flow if it ...
|
| Questions related to diodes, relativity and radiation | 9/19/2009 |
Q: Given below are some questions which I have attempted and all I want to know now is whether they are ...
A: 8. The red light will have to have more photons since each photon of red contains less energy. E=h*f ...
|
| Relative Motion Problem | 9/19/2009 |
Q: The bad guys come roaring onto a highway at 150 km/h headed for the Mexican border 395 km away. The ...
A: This is a kinematics question with two objects and, therefore, two data sets. The key to the problem ...
|
| Projectile Motion | 9/18/2009 |
Q: In a flat region, a projectile is fired in such a way that it's horizontal range is equal to three ...
A: To solve a 2 dimensional projectile problem you need to break the problem into two parts; one ...
|
| physics | 9/18/2009 |
Q: A skier is gliding along at 4.5 m/s on horizontal, frictionless snow. He suddenly starts down a 10° ...
A: There are actually two distinctly different ways to solve this problem: through kinematics and ...
|
| Physics-experiment | 9/17/2009 |
Q: Describes the steps you would take in an idealized experiment to determine the unknown mass (m) of a ...
A: I don't want to give you all the answers - you will have to fill in the blanks. The general idea ...
|
| physics | 9/15/2009 |
Q: The potential difference between the plates of a capacitor is 185 V. Midway between the plates, a ...
A: Tough problem! Realize that both the electron and the proton are going to fall through the same ...
|
| physics | 9/14/2009 |
Q: A 4kg block stretches a spring by 16cm form its unstretched position the block is removed and a 5kg ...
A: According to Hooke's Law the amount a spring stretches is proportional to the magnitude of the force ...
|
| quantum | 9/12/2009 |
Q: First I want to apologize for the length of this question bu I'm confused! I'm reading a book, it ...
A: If I could answer that question I would be up for a Nobel Prize! I am not kidding. All work done in ...
|
| multimeter | 9/12/2009 |
Q: I bought a multimeter that measures either voltage or current. I have never seen this. I have only ...
A: My first concern when you talk about household wiring is that you MUST not do anything until you ...
|
| Pumping with Compressed Air | 9/11/2009 |
Q: James, I am trying to work out why an air displacement pump delivering to a 50 metre head through 2 ...
A: I did the calculation and got that you need 55psi to lift the water to 40 meters. ...
|
| quantum | 9/10/2009 |
Q: First I want to apologize for the length of this question bu I'm confused! I'm reading a book, it ...
A: You are correct: it would be more correct to say that there is an equal probability that the ...
|
| physics | 9/10/2009 |
Q: what voltage is required to store 6.45x10^-5 C of charge on the plates of a 5.60-uF capacitor?
A: The capacitance of a capacitor is defined to be equal to the ratio of the charge stored on the ...
|
| physics | 9/8/2009 |
Q: Could you help me how to give a mathematical explanation on the basis of the Conservation of Angular ...
A: If you multiply the moment of inertia of a rotating object by its angular velocity the resulting ...
|
| dualityof light | 9/8/2009 |
Q: why cant light behave like a wave and a particle atthe same time?
A: That is not really the point. It is not that light CAN'T behave as a wave and as a particle at the ...
|
| Electricity | 9/2/2009 |
Q: Is neutral wire becoming hot,during the positive alternation?or is hot wire return path in this ...
A: The fact that current reverses direction in an AC circuit does not matter. Current going either way ...
|
| velocity/ acceleration | 9/2/2009 |
Q: A stone is dropped from the top of a building 20m hight. A second stone is dropped from 15m of the ...
A: To answer this question you need to find the time for each stone to drop to the ground and then ...
|
| atoms | 9/1/2009 |
Q: I was wondering, if atoms have electromagnetic energy does this mean that they all have ...
A: When one says that atoms have "electromagnetic energy" what is really meant is that the system ...
|
| windmills | 8/31/2009 |
Q: I am trying to make a windmill. Please look at my sketch. Can you think of an answer to my two ...
A: You would need something that permitted air to pass one direction but not the opposite. If you go to ...
|
| archimedes principle and principle of floatation | 8/29/2009 |
Q: how can i differentiate between Archemedes principle and principle of floatation? why the buoyant ...
A: Both situations make use of Newton's 1st Law! For a floating object the gravitational force downward ...
|
| physics | 8/26/2009 |
Q: How can I design an experiment to measure the center of gravity of doughnut, if I know its center is ...
A: To find the center of mass suspend the donut from any pivot point with a weighted string hanging ...
|
| atoms | 8/26/2009 |
Q: I hope this isn't a question that will prove too general or complicated to answer to a person who ...
A: The atom, i a sense, doesn't look like much. Effectively the nucleus is surrounded by very rapidly ...
|
| microwave damage to water | 8/25/2009 |
Q: <my health food friends tell me that you should not eat microwave food because it destroys all of ...
A: Sorry, but it is just nonsense! Any damage to the nutrients in the food will be due to the fact that ...
|
| time | 8/25/2009 |
Q: I saw a special on the science channel that indicated that it was possible to go back in time either ...
A: Since all fundamental particles of a particular type are indistinguishable from one another [all ...
|
| Quantum physics | 8/24/2009 |
Q: My Question is this:- When matter is created as I understand it, its anti particle is also created ...
A: When energy is used to generate particles, the resulting particles occur in pairs. The vast majority ...
|
| time | 8/24/2009 |
Q: I saw a special on the science channel that indicated that it was possible to go back in time either ...
A: There are many things to comment on here! First of all, don't confuse speculation with reality. ...
|
| gravity? kenetic energy? | 8/20/2009 |
Q: Playing the piano (keyboard): A fast arpeggio on keyboard, high notes to low ( e.g. with right ...
A: I can only surmise that there must be a component of the gravitational force acting in the direction ...
|
| Angular momentum & Earth's axial tilt. | 8/20/2009 |
Q: I'm having trouble establishing the veracity of the claim that the moon somehow stabilizes the angle ...
A: I think the best answer to this question can be illustrated from a high wire act where the person ...
|
| Buoyancy | 8/19/2009 |
Q: I'm trying to understand the relative effect of buoyancy, volume, and depth. If I tied a balloon ...
A: Your first statement is correct assuming that the balloon is completely submerged and that the ...
|
| thermal Physics | 8/18/2009 |
Q: I have spent time trying to understand and answer the following question. Would you be so kind to ...
A: Given a solar insolation of 342W/m^2 and an area of 50 m^2 this lake is receiving: ...
|
| Newton's Cradle | 8/18/2009 |
Q: James, thanks for taking the time to read my question. I'm not a student, just fascinated in the ...
A: Theoretically it should not matter, but in practice the difference would be significant. The problem ...
|
| physics | 8/17/2009 |
Q: sir can you please tell me what is gravitational acceleration all about
A: The gravitational effect of mass is to warp the shape of space in the vicinity of the mass causing ...
|
| Breaking light speed | 8/14/2009 |
Q: James, thanks for taking the time to read my question. I'm not a student, just fascinated in the ...
A: You cam come up with ant situation you can imagine but that will not change the fact that NO ONE has ...
|
| Galvanometer to Voltmeter | 8/13/2009 |
Q: for the experiment of using a galvanometer as a voltmeter what kind of graphs can i make? and what ...
A: To make a galvanometer into a voltmeter you need to connect a relatively high ersistane in series ...
|
| transverse waves | 8/11/2009 |
Q: in transverse waves is the speed of a particle different from speed of the wave propagation, or how ...
A: The speed of a wave through a medium [the propagation velocity] and the speed of the particles are ...
|
| optics | 8/9/2009 |
Q: what is the difference between a convex lens and concave lens?
A: A convex lens will be thicker at the center than at the edges and it will be able to form and ...
|
| impact of an object on a 3/4" of plywood | 8/8/2009 |
Q: Given an object falling from a height of 190' (57.912 m) with a weight of 10 pounds (4.54kg) what ...
A: The kinetic energy KE of the falling mass as it reaches the plywood will be equal to the ...
|
| restitution | 8/6/2009 |
Q: how can we calculate height of a ball it it bounces two or three times
A: Two factors need to be taken into account here: energy conservation and coefficient of restitution. ...
|
| electrostatics | 8/2/2009 |
Q: what do you mean by electric potential of a rod is 5v? what is potential difference?
A: Potential difference is a measure of how much work must be done per unit charge to move that charge ...
|
| ..please help me and my group.. | 8/1/2009 |
Q: ..hello i just wanted to ask if you have some idea for a fourth year high school investigatory ...
A: There are many projects that you could do! Let me list a few! 1. Build a "Rube Goldberg" machine. ...
|
| MECHANICS | 8/1/2009 |
Q: A UNIFORM ROD,AB OF LENGTH 4a IS ELEVATED AT THE 'A' END. THE 'B' END IS 30DEGREES TO THE ...
A: I am making the assumption that point A is on the left and is the center of rotation of the system. ...
|
| engineering and technology | 7/31/2009 |
Q: What is meant by engineering and technology?
A: From a practical point of view "Engineering & Technology" refers to the carefully planned use of ...
|
| physics | 7/26/2009 |
Q: Two pellets, each with a charge of 1microcoulomb are located 3cm apart. Show that the electric force ...
A: The electrostatic force between two charged bodies is given by: Fe=k*q1*q2/r^2 where k=9.0 x 10^9 ...
|
| Law of Conservation of Momentum | 7/25/2009 |
Q: Today we had a practical lesson involving two gliders moving on an airtrack. The first glider was ...
A: Depending upon how you measured the velocities, there is a lot of error in the typical apparatus ...
|
| Law of Conservation of Momentum | 7/24/2009 |
Q: Today we had a practical lesson involving two gliders moving on an airtrack. The first glider was ...
A: The fact is that this experiment is relatively difficult to perform successfully because of friction ...
|
| physics | 7/24/2009 |
Q: what is the energy of an electron accelerated through a potential difference of 100 volts
A: Accelerating an electron through a potential difference of 100 volts produces an energy of 100 ...
|
| theory of relavity | 7/23/2009 |
Q: This qustion is regarding relativity of time. suppose i have 2 bodies: A and B. Body A is earth.? ...
A: Sorry, there is no way to determine the mass of object B based on the given information. However, ...
|
| Physics | 7/22/2009 |
Q: Where should the birthday candle of height 5 cm be placed in front of a convex lens of focal length ...
A: The position of the object do, the position of the image di and the focal length of a mirror or lens ...
|
| Gravity and the Coriolis effect | 7/20/2009 |
Q: I was wondering if gravity could be created by spinning a ring around a large diameter round ...
A: Spinning space stations do not really create "gravity"! What they actually do is to generate an ...
|
| inclined plane friction | 7/19/2009 |
Q: I am doing an EEI. My experiment was to roll golf balls down an inclined plane in order to test ...
A: This problem is, fundamentally, a Newton's 2nd Law problem. As such, the first step is to make a ...
|
| Derivation Bimettalic Strip | 7/19/2009 |
Q: How did Dr. Lewin derive the value d= 4 mm in the video: http://www.youtube.com/watch?v=sr0yMWdWie0 ...
A: Assume that the bimetallic strip curves into a uniform circular section subtending and angle Q. The ...
|
| Einstein's photoelectric equation | 7/17/2009 |
Q: Explain why the graph of photoelectric effect experiment always has the same gradient whatever metal ...
A: According to the photo-electric equation the kinetic energy of the released electrons is given by: ...
|
| physics | 6/23/2009 |
Q: Starting from rest, a ball of mass 2 kg experiences a constant force of 2 N. What is the final ...
A: One way top solve this problem would be! 1. Use Newton's 2nd Law to solve for the acceleration: ...
|
| Prism | 6/23/2009 |
Q: Could you please tell me what is the name of the starting point from where beam is converted into ...
A: A beam of light isn't "converted" into different colors, rather, the prism takes the various colors ...
|
| Electricity | 6/20/2009 |
Q: Is neutral wire becoming hot,during the positive alternation?or is hot wire return path in this ...
A: That is not really the issue. Current always flow in the neutral wire. What is special about the ...
|
| Physics | 6/19/2009 |
Q: An electric furnace runs nine hours a day to heat a house during January (31 days). The heating ...
A: A kilowatt hour is a measure of energy and is equal to the product of the rate of energy use in ...
|
| physics | 6/19/2009 |
Q: Block 1 (2 kg) rests on the surface of a table as shown in the figure. The coefficient of kinetic ...
A: The block weighs Fw=2*9.8=19.6N. Since the coefficient of friction is 0.5, the frictional force will ...
|
| physcs | 6/18/2009 |
Q: Block 1 (m1 = 1.5 kg) is on the surface of a table as shown in the figure. The rope attached to the ...
A: First break the applied force Fa into horizontal and vertical components. I this case the components ...
|
| physics | 6/17/2009 |
Q: The force F = (80, 40) N acts on a mass of 10 kg. At time t = 0 s, the mass has a velocity v0 = ...
A: 1) To find the direction of the initial velocity calculate the direction using the tangent function: ...
|
| Physics | 6/16/2009 |
Q: A woman finds the front windshield of her car covered with ice at -12.0°C. The ice has a thickness ...
A: The heat of fusion for ice is 334 joules per gram while the specific heat of ice is 1.87 joules per ...
|
| Physics | 6/15/2009 |
Q: A person who is 1.5 m tall throws a ball with a speed of 9.8 m/s at an angle of 70 degrees above the ...
A: All two dimensional kinematics problems can be solved in the same way! There are 6 possible ...
|
| Projectile Movement | 6/14/2009 |
Q: A stone is thrown downward with a speed of 1 m/s from a height of 14 m. (acceleration due to ...
A: All one dimensional kinematics problems can be solved in the same way! There are 6 possible ...
|
| Electricity-Capacitance | 6/13/2009 |
Q: Explain why it is that some items of electronic equipment have the warning message 'Danger: Even ...
A: Unless the capacitors within the electronic device have been purposely discharged, they can store ...
|
| Electrical Fields/Electric Charges | 6/13/2009 |
Q: Given:There is an atom with a charge of +1 micro coulomb placed 1 centimeter from an atom with a ...
A: First of all, these CANNOT be atoms! A 1 microCoulomb charge contains ...
|
| Physics Problem | 6/12/2009 |
Q: A 1200 kg racing car accelerates from rest at a constant rate and covers a distance of 450 m in 10 ...
A: All one dimensional kinematics problems can be solved in the same way! First identify as many of the ...
|
| inductance | 6/11/2009 |
Q: Could you explain the following sentance. The inductance can be minimized by winding the insulated ...
A: The inductance of a coil is determined by the rate of change of magnetic flux within the coil. When ...
|
| gravity vs. drag | 6/10/2009 |
Q: If you drop two balls of I dentical size and shape, but A is made of wood (light) and one is made of ...
A: Newton's 2nd Law: SF=m*a where SF is the sum of the forces, m is the mass and a is the acceleration. ...
|
| atomic | 6/10/2009 |
Q: Are the electron neutron and proton breakable ? what remains if any of them is broken ?
A: Protons and neutrons are composite particles! Each particle contains 3 quarks. Each proton is made ...
|
| gravity vs. drag | 6/9/2009 |
Q: If you drop two balls of I dentical size and shape, but A is made of wood (light) and one is made of ...
A: No! The rate of acceleration of each ball is determined by the NET force acting on the ball. Since ...
|
| Physics | 6/5/2009 |
Q: Light reflected from the surface of a liquid is found to be completely polarised when the angle of ...
A: 1. According to Brewster's Law, maximum polarization occurs when the tangent angle of incidence is ...
|
| how does a convex mirror work? | 6/4/2009 |
Q: when a convex mirror is installed to be a security mirror or such, i know that they're better than ...
A: A convex mirror works by redirecting light that strikes it such that light coming from a wide ...
|
| Law of Conservation of Energy | 6/3/2009 |
Q: We did an experiment in class today involving rolling a ball down a slope. I calculated the change ...
A: The ball didn't gain any extra energy. It is just that the initial gravitational energy will be ...
|
| Wheatstone Bridges | 6/2/2009 |
Q: How do Wheaststone Bridges work, and how can they be used to calculate the resistance of unknown ...
A: In a Wheatstone Bridge circuit, the resistor in the bridge is replaces by a galvanometer. Why, you ...
|
| alpha | 6/1/2009 |
Q: Alpha particles perpendicular undeflected through magnetic and electric fields that are ...
A: If the alpha particle moves through crossed electric and magnetic fields and passes through the ...
|
| About electric field | 5/31/2009 |
Q: What are the differences between electric and magnetic fields? thanks a lot
A: They are VERY different. An electric field E is an area of space where any particle with a charge q ...
|
| a falling object | 5/30/2009 |
Q: James well when an object is falling vertically downward having 'g' as an acceleration, and then ...
A: When you lift an object upward you have to do work on it. This work increases the gravitational ...
|
| radius of an arc | 5/29/2009 |
Q: X^+2 and Y^+ ions, whoes masses are 8.35 x 10^-27 kg and 3.34 x 10^-27 kg respectively, traveling at ...
A: For a particle moving in a circular path in a uniform magnetic field Newton's 2nd Law predicts: ...
|
| Ionization | 5/29/2009 |
Q: if a hydrogen atom is in level 2 and is hit by a 332 nm photon how do you show that the electron ...
A: Solve this problem by using energy conservation! The energy of the incoming photon of light E=h*c/l ...
|
| a question of time dilation in special relativity from a (currently) layperson's perspective | 5/28/2009 |
Q: On a purely logical level, ideally with only any basic math that may be necessary, not having ...
A: The problem here, is that both the observer on the Earth and the observer on board the rocket will ...
|
| throw | 5/27/2009 |
Q: When rain (with constant velocity), if you want walk from one place to another place how can you go ...
A: This is an answer that I just did yesterday! I propose breaking this up into two parts: one ...
|
| Running in the Rain? | 5/26/2009 |
Q: When rain (with constant velocity), if you want walk from one place to another place how can you go ...
A: I propose breaking this up into two parts: one horizontal and one vertical. I made the following ...
|
| Millikan | 5/24/2009 |
Q: In 1912, Robert Millikan noticed that charged plates would clear condensed water vapour (fog) from a ...
A: This problem is essentially a Newton's 1st Law problem, the electrostatic force upward caused by the ...
|
| Millikans oil drop | 5/24/2009 |
Q: A student performs Millikan oil drop experiment in which latex sphere with a mass of 5.00 x 10 to ...
A: This problem is essentially a Newton's 1st Law problem, the electrostatic force upward caused by the ...
|
| radius | 5/22/2009 |
Q: A proton enters a magnetic field at a right angle to the field. An alpha particle enters the same ...
A: For a charged particle moving perpendicularly to the magnetic field the resulting magnetic force ...
|
| Physics | 5/21/2009 |
Q: I just got this questions and I don't even know how to start it It will be awesome and really ...
A: Use energy and momentum conservation! The initial kinetic and gravitational energy of the S10 pickup ...
|
| Balmer Series | 5/21/2009 |
Q: The regions of the electromagnetic spectrum into which the lines of Balmer Series of hydrogen are ...
A: The Balmer spectrum of Hydrogen corresponds to electrons moving from n=3,4,5 and 6 down to level n=2 ...
|
| How a PN-junction diode works? | 5/18/2009 |
Q: It would be most helpful if you could explain to me how a PN junction diode really works. I already ...
A: The key to this question is the degree of doping done to the semiconductors. Actually, the number of ...
|
| minimum angular velocity | 5/17/2009 |
Q: if a 6 sided mirror and a fixed mirror are 45.0km apart. What minimum angular velocity in (RPS) that ...
A: If the fixed mirror is 45km away, the round trip for lint would be 90km. Since the speed of light is ...
|
| question about anti-matter and the movies | 5/17/2009 |
Q: In the new Tom Hanks movie they "created" anti-matter into glass vials, suspended between two ...
A: First of all, antimatter is NOT negative. Most antimatter just has a charge opposite that of the ...
|
| movement | 5/15/2009 |
Q: A motor car is 500kg and it accelerates from a velocity of 18m/s to 50m/s in 5 seconds. How do I ...
A: All problems of this type can be solved in the same way. There are six kinematics variables and two ...
|
| mass of balloon | 5/14/2009 |
Q: What is the average mass of a standard water balloon?
A: I don't think that there is a "standard" water balloon. However, water weighs about 8 pounds per ...
|
| Terminal velocity | 5/14/2009 |
Q: I have a student who argues that the impact from a person falling from a three story building would ...
A: The force acting on the falling person when they strike the ground would be given by Newton's 2nd ...
|
| Inductance of wire | 5/13/2009 |
Q: I believe for a straight piece of wire the inductance is roughly 1nH a millimetre (I guess it ...
A: I think that you will find the information you require regarding a long straight wire at ...
|
| Newton's 3rd Law | 5/13/2009 |
Q: Say a mosquito hits a bullet train. The law states that for every action there is an equal and ...
A: Just because the force on the mosquito is equal to the force on the train does NOT mean that the ...
|
| When do two objects officially touch? | 5/12/2009 |
Q: This was probably asked a million times before, but I'd like to know the following: When is ...
A: This question is virtually impossible to answer. But there are limits to how small of a length we ...
|
| Motion and conservation of energy | 5/12/2009 |
Q: Mr. Kovalcin, This is the data for a roller coaster. Instead of a cart though, it is a ball of mass ...
A: In the first case energy seems to be conserved within experimental error in all cases. In the second ...
|
| Maximum frequency | 5/11/2009 |
Q: cathode rays strike a metal target travelling at 8.50 x 10^6 m/s. what is the maximum frequency of ...
A: This is called the "inverse photoelectric effect". The kinetic energy of the incoming electrons ...
|
| Musical Acoustics | 5/11/2009 |
Q: If the velocity of transverse waves on a certain string of length L=0.3 m is v(subscript t)=240 m/s, ...
A: If a string is attached at each end, the smallest part of a standing wave that can resonate on that ...
|
| Photons | 5/10/2009 |
Q: The power in a laser beam is equal to the energy of each photon times the number of photons per ...
A: The energy of a light wave is given by: U=h*f=h*c/L where U is the the energy content of the wave, f ...
|
| voltage, electron | 5/10/2009 |
Q: An electron is accelerated from rest through a potential difference. If this electron has a ...
A: According to the deBroglie relationship: h/L=p where h is Planck's constant, L is the wavelength ...
|
| radius | 5/9/2009 |
Q: Given the wavelenght of an electron 2.08 x 10^-9 m, calculate the radius of the deflection arc that ...
A: If you know the wavelength of the electron, you can determine the speed of the electron using the ...
|
| Einstein Nobel Prize | 5/7/2009 |
Q: I know Albert Einstein received the Nobel Prize for his work on the photoelectric effect. Why did he ...
A: The tradition of the Nobel Prize is that a person can only receive the prize once in a particular ...
|
| Electromagnetic theory | 5/5/2009 |
Q: Two parallel rails are connected together at one end by a resistanceof R = 20.0 W as shown in the ...
A: According to Faraday's Law the EMF generated in the closed conducting path is given by: EMF=-Df/Dt ...
|
| mass | 5/4/2009 |
Q: i wanna ask how we can calculate mass of objects in space which no gravity exists!!? would u please ...
A: One way to do this is to use an "inertial" balance, which consists of a container vibrating on the ...
|
| release velocity | 5/2/2009 |
Q: This is a question from my uil calculator contest. I could not figure out the steps to the ...
A: This is a typical 2 dimensional kinematics problem. There are 6 possible variables: Do - the initial ...
|
| physics | 5/1/2009 |
Q: i am not extremely that good in physics so i deemed it useful to keep practicing. i came across a ...
A: Making the following assumptions! Distance to water from bridge - h Length of unstretched bungee ...
|
| natural frequency | 5/1/2009 |
Q: How does the sound of a string vibrating at its natural frequency compare to its sound at other ...
A: A string vibrating at a particular fundamental frequency will also resonate at any integer multiple ...
|
| WAVE-PARTICLE DUALITY | 4/30/2009 |
Q: Q:The DeBroglie wavelength of a particle is given by lambda=h/mv. Two properties of the particle ...
A: The group action explanation doesn't sound right to me. On the other hand, the wavelength of a ...
|
| tire speed | 4/30/2009 |
Q: My friends and I were arguing the other day if the center of a car tire going 50 mph, the same as ...
A: Actually, no! If the car is moving down the highway at 50mph, the top edge of the tire will be ...
|
| capacitance | 4/29/2009 |
Q: I need help with the following: A parallel capacitor has a capacitance of 10mF and is charged with a ...
A: The capacitance of a parallel plate capacitor is given by: C=eo*K*A/d where eo=8.85 x 10^-12 ...
|
| Physics | 4/29/2009 |
Q: Does an electron always experience a force in an electric field but not always in a magnetic field?
A: The electric force on a charged particle in an electric field is given by: Fe=E*q. The magnetic ...
|
| Light Bulb that never burns out | 4/27/2009 |
Q: Looking at this webpage: http://www.newton.dep.anl.gov/askasci/gen99/gen99654.htm It seems to say ...
A: An ordinary light bulb filament "burns out" not because of oxygen but because of the gradual ...
|
| physics | 4/25/2009 |
Q: 1. While riding the merry-go-round at the playground, Monique, who has a mass of 45 kg, is traveling ...
A: The real key to rotational motion is that the physics is the same as in linear motion while the ...
|
| energy | 4/24/2009 |
Q: Your help is very much appreciated. 1- A novice skier, starting from rest, slides down a ...
A: 1. Using energy conservation the skier begins with gravitational energy and ends with kinetic: ...
|
| Heat flow through skin | 4/23/2009 |
Q: A person has a core (inner) body temperature of 36degrees C, and the air temperature is 20degrees ...
A: That rate at which heat flows through a surface DQ/Dt is given by: DQ/Dt=sigma*A*DT/d where sigma ...
|
| Baseball hits a person in dugout? | 4/21/2009 |
Q: If a person in the dugout is hit in the face or head area, by a foul ball (hard hit line drive), ...
A: Of course! Here are the results of a recent 2007 study: "BASEBALL - HIGH SCHOOL A 14 year-old high ...
|
| Equation for baseball height and distance | 4/18/2009 |
Q: A boy hits a baseball and it travels for 440 feet before it lands. When he hits the ball it is ...
A: All 2 dimensional freefall problems can be solved in the same way! Because this is a two dimensional ...
|
| optics | 4/17/2009 |
Q: why are convex mirrors used as driving mirrors?
A: A convex mirror gives a greater range of view than a plane mirror. There is one problem, however. ...
|
| Speed of Light | 4/17/2009 |
Q: If a car is traveling 20 miles per hour and turns on its headlights, will the light be traveling the ...
A: I know this may not make much sense, but the speed of the light emitted by the moving car will be ...
|
| trouble with simple harmonic motion | 4/15/2009 |
Q: I have this right or wrong question that i know the answer to but not the way to solve it can you ...
A: You are assuming that the spring CONSTANT is changing! In general, the spring constant is determined ...
|
| Light bulb efficiency vs filament temperature | 4/14/2009 |
Q: Could you tell me why a hotter filament is more efficient than a cooler one? (why you get more ...
A: The rate at which light is radiated from a hot object is given by: DQ/DT=sigma*emissivity*A*T^4 ...
|
| Physics: Ideal Gases | 4/14/2009 |
Q: Kovalcin, My lab TA suggested that we try to answer the following multiple step question as ...
A: All of these questions use the ideal gas law: P*V=n*R*T 1. If you add heat to a gas the temperature ...
|
| trouble with simple harmonic motion | 4/13/2009 |
Q: I have this right or wrong question that i know the answer to but not the way to solve it can you ...
A: I think that you already have the answer! The period of a mass oscillating on the end of a spring is ...
|
| An ascending air bubble | 4/13/2009 |
Q: An air bubble ascends from the bottom of a lake 12.3m deep. The temperature at the bottom of the ...
A: To solve all problems of this type use the universal gas law: P*V=n*R*T where P is the absolute ...
|
| Magnitude | 4/12/2009 |
Q: Two ropes are attached to a 40 kg object, which rests on a horizontal surface. The first rope ...
A: The resultant of two forces acting perpendicularly to one another can be found using the Pythagorean ...
|
| Work Engery Theorem | 4/12/2009 |
Q: Eric pulls a 15 kg box across a horizontal, frictionless floor by a rope starting from rest. The ...
A: According to the Work-Energy Theorem, the change in the energy of a system is equal to the net work ...
|
| Physics-Light | 4/11/2009 |
Q: When the outer electrons that buzz about the atomic nucleus encounter electromagnetic waves, what ...
A: Several different results can occur! 1. If the incoming EM wave has too little energy [more about ...
|
| Hydrogen gas baloon | 4/11/2009 |
Q: You place 87 moles of hydrogen gas in a balloon of volume 2.4m3, and find the pressure to be 1.5 ...
A: 1. Use the Universal gas law to determine the temperature of the gas. 2. Use the temperature of the ...
|
| friction | 4/7/2009 |
Q: A 182 g block is launched by compressing a spring of constant k=200 N/m a distance of 15 cm. The ...
A: This problem is, of course, an energy conservation problem. Initially, all of the energy in this ...
|
| Potential energy | 4/6/2009 |
Q: A 120g arrow is shot vertically from a bow whose effective spring constant is 400 N/m, if the bow is ...
A: Use energy conservation! The elastic energy EPE at the beginning will be equal to the gravitational ...
|
| Urgent. need help!! | 4/4/2009 |
Q: The electric field inside a hollow conductor is zero. I cant prove this statement. How can i prove ...
A: There are two different ways to approach this! 1. According to Gauss' Law, the strength of the ...
|
| Kinetic energy of a mass-on-a-spring oscillator | 4/3/2009 |
Q: The position of a mass-on-a-spring oscillator is given by y = A sin(23 t) where the value of t is ...
A: For any simple harmonic oscillator the displacement from equilibrium is given by A=Ao*sin(w*t) ...
|
| physics/power | 4/2/2009 |
Q: A given load is to be raised through a vertical distance of 10 meters in 30 seconds by using a force ...
A: Power is defined to be the work done divided by the time over which the work is done. Since work is ...
|
| magnetism | 4/2/2009 |
Q: A hollow copper cylender carrying current why B=0(magnetic density) inside? do u think that outside ...
A: I suspect that my answer will still not be satisfactory and for good reason! Magnetism is, in ...
|
| magnetism | 4/1/2009 |
Q: can you explain the answer to question 21 to me on this page ...
A: According to Faraday's Law any change in the magnetic flux within a closed conducting path will ...
|
| magnetism | 4/1/2009 |
Q: When two parallel conducting wires repel each other, the currents in the wires are A. in opposite ...
A: Assume that the two wires are running vertically from the top of the page towards the bottom of the ...
|
| Waves | 3/31/2009 |
Q: Sonar: Suppose you are fishing using your handy dandy new sonar. The sonar display tells you there ...
A: Since the speed of sound is significantly faster in water [~1435m/s] than in air [~346m/s], the time ...
|
| Waves | 3/31/2009 |
Q: If you are very far away from an object when it is hit, you often see the collision before you hear ...
A: The speed of light in air is about 186,000 MILES per second, while the speed of sound in air is ...
|
| Screw Jack Calculation | 3/30/2009 |
Q: I am 46 and have to figure this out. If a screw jack has a pitch of 3mm, a double start thread, a ...
A: I think that this question is missing an important piece of information, the diameter or radius of ...
|
| magnetism | 3/30/2009 |
Q: A hollow copper cylender carrying current why B=0(magnetic density) inside? do u think that outside ...
A: The magnetic field within the hollow tube will be zero, but outside the tube the magnetic field ...
|
| calculating speed ( magnetic field) | 3/27/2009 |
Q: The conducting rod in the diagram is 54 cm long, and is moved at a constant speed perpendicular to ...
A: According to Faraday's Law the EMF [the increase in potential difference] generated by a changing ...
|
| electroscope | 3/26/2009 |
Q: 27. A positively charged rod is held near the sphere of a neutral electroscope. a. What happens to ...
A: When you move the positive rod near to the sphere at the top of the electroscope, the rod will ...
|
| Magnetics question on calculating energy gained | 3/24/2009 |
Q: Can anyone help me with question 17 on this page http://www.studyphysics.ca/30/phys30_jan02_de.pdf ...
A: Potential difference V is equal to work done per charge: V=W/q Therefore, the work done on a charged ...
|
| Magnetic field help | 3/23/2009 |
Q: An electron particle is accelerated by a potential difference of 2.33 x 10^3 V as it travels ...
A: When a charged particle is accelerated by a potential difference V, the energy U gained by the ...
|
| physics | 3/23/2009 |
Q: Three blocks are pulled by a force of 16.5 newtons along a frictionless surface, the boxes are ...
A: According to Newton's 2nd Law, the sum of the forces acting on a system is equal to the product of ...
|
| centripetal force | 3/22/2009 |
Q: I have trouble to understand: the DEF of centripetal force?
A: Consider a car moving forward at a constant speed. If you apply a force in the direction of the ...
|
| Magnetics | 3/21/2009 |
Q: I having problems on questions 20 and 21 on this practice exam site: ...
A: 20) Assume for a moment that you have two wires, parallel to one another and pointing into the page. ...
|
| Conservation of Linear Momentum ... Please Help!! | 3/21/2009 |
Q: I really do need help with this question . I think my hardest part is identifying the different ...
A: Let me start be defining some variables! m1=55kg mass of the girl m2=80kg mass of the boy m3=0.050kg ...
|
| electric force | 3/20/2009 |
Q: Two charged objects of identical size and mass are brought together in brief contact. If the one ...
A: When you touch the identical balls together, the charges on the two balls interact and neutralize ...
|
| Coefficient of friction | 3/20/2009 |
Q: can you help. the question is, A child drags a 3kg(29.4N) boogie board across the sand by means of a ...
A: Since the sled is being pulled at a constant speed, the system is at equilibrium and opposite forces ...
|
| gravitational and gravitational fiels | 3/19/2009 |
Q: please PLEASE help me... a satellite is designed to orbit earth at an altitude above its surface ...
A: Do you mean 4.5m/s^2? Your question as stated has no real answer. If you do mean a gravitational ...
|
| electric potential | 3/16/2009 |
Q: A Coulomb explosion occurs when a high-energy complex ion is brought to rest in a collision with a ...
A: The energy of the Helium ion is: E=3.0Mev=3.0x10^6eV*1.6*10^-19J/eV=4.8x10^(-13)J Potential ...
|
| Coulomb explosion | 3/15/2009 |
Q: A Coulomb explosion occurs when a high-energy complex ion is brought to rest in a collision with a ...
A: 1. Electrostatic potential difference is equal to work done per charge: V=W/q. The work done on the ...
|
| Wind | 3/15/2009 |
Q: Modern Sail boats are able to "move" against the wind in a monouvere called tacking.This is only ...
A: Because of the Earth's rotation the prevailing winds are id different direction depending on the ...
|
| mechanics problems | 3/14/2009 |
Q: A box, initially at rest, is pulled up an incline by a force F = 50 N parallel to it. The incline ...
A: First make a freebody diagram labeling all of the forces acting on the cart as it is pulled up the ...
|
| Electricity | 3/14/2009 |
Q: Can you please help me with Numerical response 8 and multiply choice question 14-16 on this site: ...
A: 8) To find the number of excess electrons divide the charge of the oil drop by the charge of a ...
|
| light | 3/13/2009 |
Q: could you help me with this? when astronomers observe a supernova explosion in a distant galaxy, ...
A: Of course! If the different colors [frequencies] of light traveled at the different speeds they ...
|
| Algebra Physics | 3/13/2009 |
Q: A father pulls his 25-kg daughter on a 5-kg sled across a snowy field. If the father pulls on the ...
A: First make a freebody diagram. In this case there should be 3 forces: a normal force of the ground ...
|
| Magnetic Fields | 3/12/2009 |
Q: A particle undergoes uniform circular motion of radius 12.5 micronmeters in a uniform magnetic ...
A: Because this is a charged particle moving in a circular path this is a Newton's 2nd law problem ...
|
| Fan with louver | 3/11/2009 |
Q: I have a freezing unit with 4 fans. The fans are 35" in diameter. I believe the rotation of the ...
A: Depends on what you are trying to achieve! If you are looking for maximum air flow leave the louvers ...
|
| Physics | 3/10/2009 |
Q: My Question is attached. I tried to solved by finding tension force and then find the theata, but i ...
A: a. The angles will be the same! If you make a force diagram for either ball you will get a vertical ...
|
| Physics problem | 3/10/2009 |
Q: A tank that is 62 meters away is approaching you at a speed of 6 m/s. Your cannon currently is set ...
A: To solve this problem you will need to calculate the position of both the tank and the projectile ...
|
| physics | 3/8/2009 |
Q: A wheel's uniform angular acceleration is constant. Initially its angular velocity is zero. During ...
A: The thing to be aware of when doing rotational motion is that the relationships among the variables ...
|
| Thermodynamics | 3/6/2009 |
Q: I taught AP B Physics for 30 years and am now retired but still tutoring. This question was asked by ...
A: Seems pretty pathetic! Is it possible that the overall efficiency of electrical power delivery is ...
|
| help plz | 3/6/2009 |
Q: I’ve some questions Can u help me with them please? Q1. One car travels due east at 40Km/h, and ...
A: Q1. No! Since velocity is a vector both direction and magnitude matter. For example, suppose that ...
|
| Orbital Physics problems | 3/4/2009 |
Q: recently my physics class has been working on problems concerning the periods of planets and other ...
A: If an asteroid is orbiting the sun, it is moving in a circular path and is, therefore, following ...
|
| motion | 3/3/2009 |
Q: i've several Qs can u help me plz!! Q1. A horse canters away from its trainer in a straight line, ...
A: Q1. The issue here is the difference between "speed" and "velocity". Speed is "distance" divided by ...
|
| mechanics | 3/3/2009 |
Q: A beam AB 5m long is supported at A & B carries two point load W1 and W2 of 3N & 5N which are 1m ...
A: I am making the following assumptions: Force A is upwards at the left end Force B is upwards at the ...
|
| Oscillations | 3/2/2009 |
Q: A solid sphere of radius r is placed at the bottom of a spherical bowl of radius R.When pushed ...
A: Good point! If you apply this, the restoring force F becomes: F=m*g*x/R-Ff While the frictional ...
|
| physics problem | 3/2/2009 |
Q: A 1500 kg car can accelerate from rest to 72 km/hr in 8.0 sec. What is the net force acting on the ...
A: This problem can most easily solved by making use of the "impulse" equation - a variation on ...
|
| Physics | 3/1/2009 |
Q: As shown below, two blocks on an inclined plane are connected to each other by a light string ...
A: The freebody diagram for this system should include the following forces: m1: Fg1*sin(Q) [the ...
|
| Oscillations | 2/27/2009 |
Q: A solid sphere of radius r is placed at the bottom of a spherical bowl of radius R.When pushed ...
A: Tough question that I have never come upon before! Here is my analysis. As the ball is displaced ...
|
| physics | 2/26/2009 |
Q: an object with a mass of 10kg slids upwards on a slippery vertical wall. a force of 60 N acts at an ...
A: I assume from the wording of the problem that the vertical surface is frictionless. I am likewise ...
|
| Momentum | 2/26/2009 |
Q: Two particles of mass m1 = 1.4 kg and m2 = 2.3 kg are traveling with velocities v1 = 4.7 m/s, and ...
A: Since momentum is a vector quantity you will need to find the momentum of each object separately and ...
|
| Physics homework help | 2/25/2009 |
Q: Please help to show me how to do this problem. Two blocks, one of mass 5.0 kg and the other of ...
A: This is a Newton's 2nd Law program where the sum of the external forces SF acting on the system will ...
|
| problem | 2/23/2009 |
Q: a hockey ball of mass 200g travelling at 10m/s is struck by a hockey stick so as to return it along ...
A: Momentum is equal to the product of mass and velocity and is a vector quantity. The incoming ...
|
| Conservative Energy forces | 2/21/2009 |
Q: 1) A woman carries a large bucket of water to the top of a 40m tower at a constant upward speed. The ...
A: 1) Seems to me that is this first problem you should be able to determine the work done by the ...
|
| physics | 2/20/2009 |
Q: A sailboat is moving at a constant velocity of 8 km/h eastward.Describe two opposing forces acting ...
A: In order for the boat to move forward at a constant speed the force of the wind acting on the boat ...
|
| Work Done | 2/20/2009 |
Q: A crate of mass 28 kg is pushed up a ramp by a person, at a 30 degree angle. Assume the coefficient ...
A: Work done is equal to the force required to move the object times the distance the object is moved. ...
|
| magnetism | 2/19/2009 |
Q: Why are nickle and iron magnetic?
A: All materials fall into three different categories with respect to magnetism: ferromagnetic, ...
|
| auto accident-How fast? | 2/19/2009 |
Q: How fast does a 1993 acura weighing approximately 2560 lbs have to be going to hit a back wheel on ...
A: I am sure that this is not a complete analysis, but here is at least a partial solution. First ...
|
| charges in particles | 2/17/2009 |
Q: what is actually the meaning of charges? a proton has positive charge and an electron has a negative ...
A: I can't really say WHY particles have charge, only that they do. NO ONE really knows why! Charge is ...
|
| Batteries | 2/16/2009 |
Q: I was just wondering, when 3 identical cells are connected in series across a filament, in which ...
A: If three identical cells are connected in series with a light bulb they should all discharge at the ...
|
| specific gravity | 2/15/2009 |
Q: I am studying for my Marine engine driver grade 2 (MED 2)certificate and I am stuck on a few ...
A: Specific gravity just refers to how the density of something compares with the density of water ...
|
| Weight vs Engery | 2/14/2009 |
Q: If you have a large box full of Canaries(birds) on their perch and place this on a scale and weight ...
A: The weight of the box will be the same whether the birds are flying or not! The only way that the ...
|
| Circular Motion | 2/13/2009 |
Q: A car is travelling with a constant speed of 27 m/s. The car is equipped with 205/65 R15 tires that ...
A: The interesting thing about this problem is that the centripetal acceleration of the stone lodged in ...
|
| Circular Motion | 2/12/2009 |
Q: In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital ...
A: This is a Newton's 2nd Law problem, the sum of the forces acting on an object is equal to the mass ...
|
| Inertia | 2/11/2009 |
Q: If a car travels in a circular path at constant speed, is the motion of the car Inertial Frame of ...
A: In order for a frame of reference to be "inertial" there can be NO accelerations! Since a car ...
|
| Hammer Rotation Puzzler.??? | 2/11/2009 |
Q: .. Below is a link that shows a blond Russian lady Hammer thrower (ther are about 4 other ...
A: I think, from looking at the video, that your observations are due primarily to the positioning of ...
|
| simple math | 2/10/2009 |
Q: I need to know the impact force of a 1 Kg dropped 1m please, I am struggling , would appreciate help ...
A: The impact force of the dropped mass depends on how long it takes to stop the mass when it contacts ...
|
| charged particles | 2/10/2009 |
Q: How do caheged particles lose their charge? Is it possible to place charged particles in a container ...
A: Innately charged particles do not lose their charge! Electrons and protons cannot lose there charges ...
|
| physics NYC - waves | 2/9/2009 |
Q: The pendulum of a pendulum clock consists of a 0.99m long rod with a bob of mass 0.40kg. the ...
A: The basic approach of this problem will be to use energy conservation. As the pendulum swings ...
|
| newton's2nd law | 2/8/2009 |
Q: Standing on an stationary elevetor,there is no net force as the normal reaction=my weight.The cables ...
A: Both you and the elevator are being accelerated separately by the same planet! When in freefall you ...
|
| Spaghetti | 2/6/2009 |
Q: today i decided to make myself some spaghetti i boiled some water in a pot with about 10 inch ...
A: Fluid convection! As the flame below the pot heats the water in the center of the pot, the water ...
|
| Newton's 2nd Law | 2/4/2009 |
Q: Recently I was tobogganing with my little brother. After racing to the bottom of the hill (which I ...
A: Forgetting about rolling for a moment, when you toboggan down the hill, the mass, in general, will ...
|
| Third Law | 2/2/2009 |
Q: I cannot lift myself up by pulling on my own hair but I can pull myself up a rope tied to the ...
A: When you pull up on your hair, your hair pulls down on your hand! When you pull down on a rope ...
|
| Harmonics | 2/2/2009 |
Q: A two end open pipe organ's 5th harmonic produces a frequency of 3 beats per second with a tuning ...
A: If there is a beat frequency of 3Hz, the resonant frequency of the organ pipe must either be 3Hz ...
|
| Correspondence Physics | 2/1/2009 |
Q: Sir, I am sure you are watching the Superbowl this afternoon, but this far away member of the ...
A: In my experience physics almost always needs a teacher - even for the best of students. Physics can ...
|
| physics | 1/29/2009 |
Q: A 1.60-m-tall girl throws a football at an angle of 41.0 degrees from the horizontal and at an ...
A: All two dimensional kinematics problems are solved in the same way! In kinematics there are six ...
|
| Banked Curves | 1/29/2009 |
Q: Is there still friction -static or kinetic- present even when the highway is banked at an angle at ...
A: If the curve is banked so that no friction is required, then there will be no friction! How could it ...
|
| Physics - Balanced Forces - Resolving Resultant Forces | 1/27/2009 |
Q: 1) A point object of weight 6.2N is acted on by a horizontal forced of 3.8N. Calculate the resultant ...
A: Since these two vectors are perpendicular you can find the resultant by using the Pythagorean ...
|
| physics | 1/26/2009 |
Q: A 1500 kg car traveling at 90 km/h east collides with a 1000 kg car traveling at 60 km/h south. The ...
A: The generic solution for any momentum conservation problem is given by: m1*v1+m2*v2=m1*v3+m2*v4. In ...
|
| Physics problem .. please step by step | 1/26/2009 |
Q: A toy rocket, of mass 0.12 g, achieves a velocity of 40 m/s after 3.0 s when fired straight up. What ...
A: First, let me say that I am assuming that the mass of the rocket is 0.12kg or 120 grams, not 0.12 ...
|
| physics/collisions | 1/25/2009 |
Q: two identical vehicles are zooming at each other at equal but opposite speeds and they crash head ...
A: Since these two vehicles have the same mass and opposite velocities, the final velocity of each ...
|
| should we spend time in the sun | 1/24/2009 |
Q: hi i am writing to see if you can should we spend time in the sun i am doing it at school and i am ...
A: There are two very different aspects to this question! On one hand the ultraviolet light given off ...
|
| Does surface area effect friction when mass stays the same? | 1/23/2009 |
Q: Does surface area effect friction when mass stays the same? Say for hard plastic wheels on hard wood ...
A: Contrary to your intuition, surface area does not directly affect the frictional force between two ...
|
| Pulley | 1/22/2009 |
Q: Consider two masses m1 and m2 connected by a thin string in opposite ends on a pulley. Assume the ...
A: This problem is a Newton's 2nd problem: SF=m*a where SF is the sum of the external forces acting on ...
|
| freeze point for water under pressure | 1/21/2009 |
Q: Is there a chart showing at what temperature water will freeze under pressure? For example, at zero ...
A: If you go to http://www.lsbu.ac.uk/water/phase.html you will find a graph plotting the melting point ...
|
| Thermodynamics | 1/20/2009 |
Q: How will you explain that the efficiency of a heat engine cannot be 100% in terms of heat absorbed ...
A: In order for a heat engine to work you need two reservoirs at different temperatures. Consider, for ...
|
| an improvised hot air ballon | 1/19/2009 |
Q: why does the hot air ballon flew when you just use candle and plastic? What area in physics does it ...
A: Hot air balloons work because the density of hot air is much less than the density of cooler air! ...
|
| for physics | 1/18/2009 |
Q: What was wrong with Newton's corpuscular theory of light?
A: Perhaps not as much as you might think! Throughout the 17th, 18th and 19th centuries a lot of effort ...
|
| Overall wieght calculation | 1/17/2009 |
Q: If a motorcycle is travelling at 40mph and weighs 214kgs and collides into an object without and ...
A: The answer to this question is determined by two factors: how long did the collision take and what ...
|
| Elasticity | 1/17/2009 |
Q: Why Rubber does not obey Hook's Law though it possesses elasticity?
A: Whether or not a substance/object obeys Hooke's Law depends on what the object is made from and its ...
|
| Electric field within wire | 1/16/2009 |
Q: If I have a wire and use a battery to apply a potential difference between the two ends, do I get an ...
A: Absolutely! Why would the electrons move through the wire in the absence of a force. After all, the ...
|
| global warming | 1/10/2009 |
Q: In your expert opinion, what effect does melting ice cover (in Greenland, Arctic,Antarctic, etc.) ...
A: I a not really an expert in this field, however, there are a number of things that a physicist can ...
|
| Physics | 1/7/2009 |
Q: A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a ...
A: This is a kinematics problem that requires you to set up two data tables: one for the first skater, ...
|
| A tough one (of 2) | 1/5/2009 |
Q: I see you "have a particular interest in modern physics topics." That's good, because another expert ...
A: I think the problem here is that you are assuming a mass density of the universe that is MUCH higher ...
|
| non-ferrous metal | 1/4/2009 |
Q: James, I have a twenty-five foot tall Aluminum light pole in my Pennsylvania yard. It was a former ...
A: Your flagpole is a "simple harmonic oscillator" with a relatively high "quality value"! What does ...
|
| Physics | 1/2/2009 |
Q: A 4.3 g bullet leaves the muzzle of a rifle with a speed of 338 m/s. What force (assumed constant) ...
A: First treat the problem as a kinematics problem to determine the acceleration of the bullet. There ...
|
| Creation of energy | 1/1/2009 |
Q: If energy cannot be created, why in a hot air generator prototype which uses a friction-adiabatic ...
A: I am not exactly familiar with what you are referring to, but when you compress a gas adiabatically ...
|
| magnetism | 12/30/2008 |
Q: I would like to convert the strength of magnets that are measured in pounds (the kind you buy in the ...
A: You cannot get from one to the other in any simple way. However, the magnetic field strength of such ...
|
| Water and Gravity | 12/30/2008 |
Q: I'm trying to figure out what the effect of higher gravity/lower gravity would be on water. For ...
A: If gravity was 2x Earth gravity: Surface temperature would remain the same, however, that surface ...
|
| how does terminal velocity vary with the shape of object | 12/29/2008 |
Q: I wanted to ask if terminal velocity will vary if I use objects of different sizes. Example-which ...
A: Shape matters a great deal and is not easy to model. However, if the shape remains the same but the ...
|
| internal resistance of battery | 12/28/2008 |
Q: What factors are affected inside a battery that leads to a change in internal resistance when the ...
A: I think that you and I are using the word "capacity" very differently. It is my understanding that ...
|
| Mechanics | 12/27/2008 |
Q: This question was on my final for mechanics. A 5 kg block rests on a frictionless hill angled at a ...
A: As I understand your question this is a system at equilibrium. If so, the force of gravity on the 15 ...
|
| internal resistance of battery | 12/26/2008 |
Q: What factors are affected inside a battery that leads to a change in internal resistance when the ...
A: As the temperature of a battery is increased the rate of the chemical reaction increases which in ...
|
| internal resistance of battery | 12/26/2008 |
Q: What factors are affected inside a battery that leads to a change in internal resistance when the ...
A: Batteries work because there is a chemical reaction within the battery that does work on charge ...
|
| Electricity | 12/25/2008 |
Q: Sir will you pls explain me how a resistance box works?
A: I can't speak for all resistance boxes, but the ones that I use in my classroom have carbon ...
|
| Blu-Ray laser | 12/24/2008 |
Q: Why are blu-ray lasers higher power than ordinary CD/DVD player lasers? Is this because the ...
A: It is not a matter of more energy! Rather it is a matter of wavelength! Blue light has a smaller ...
|
| electromagnetism | 12/21/2008 |
Q: Can you tell me please, why a neon tube traversed by an electric current doesn't attract ...
A: The current in a neon tube is AC rather than DC. This means that the average field near the neon ...
|
| ladder problem. | 12/19/2008 |
Q: I'm trying to calculate how high a 490N person can climb up a ladder before it starts to slide out ...
A: This problem requires the application of Newton's 1st Law with application of the two conditions ...
|
| Dark Matter | 12/18/2008 |
Q: What is dark matter and what has the most recent research into the subject revealed about its ...
A: Dark matter is matter that does not radiate detectable radiation and as a result is seemingly ...
|
| kinetic energy | 12/18/2008 |
Q: what is the diffrence between kinetic energy and work and how is that there is a kinetic energy for ...
A: Work occurs when a force is applied and as a result motion occurs - the force being applied must be ...
|
| electric potential | 12/17/2008 |
Q: what is meant by electric potential and what is the negative work
A: Electric potential is a lot like gravitational potential. If work is done to lift a box onto a ...
|
| how does color affect heating by absorption of light | 12/15/2008 |
Q: i am in the 8th grade and i am doing a science fair project on the above subject and didn't know if ...
A: Generally speaking, the darker the color, the more light energy that is absorbed and converted into ...
|
| Coulomb's Law | 12/14/2008 |
Q: "Hi, I'm having alot of trouble understanding the basics of Coulomb's law. For one thing I can't get ...
A: The electrostatic force between two charged particles is given by F=k*q1*q2/R^2. This means that the ...
|
| Force distance traveled in air question | 12/13/2008 |
Q: This is a 9/11 towers physics question. I am trying to remember my physics and was wondering if you ...
A: From an energy conservation point of view this is entirely possible. Let me give you an example! ...
|
| Torque Calculation | 12/11/2008 |
Q: How do I calculate the torque required to turn a shaft? I know torque = Force x radius but I do not ...
A: You will need to find out how much force is needed to rotate the drum first. The torque required ...
|
| physics investigatory project | 12/8/2008 |
Q: what is the easiest physics investigatory project to be done? our teacher have told us that we ...
A: Where can I begin? There is literally an infinite number of choices since physics is about ...
|
| motion | 12/7/2008 |
Q: Kovalcin,here is my physics problem: An airplane with a speed of 200 mi/h is heading 30.0 degrees ...
A: You are correct that the problem is a vector addition problem. Because the velocity of the airplane ...
|
| Paperweight/Fluids | 12/4/2008 |
Q: James, I have this problem that I really don't know how to do. I tried this 2 -3 times but I like ...
A: When immersed in a liquid the decrease in apparent weight is equal to the weight of the displaced ...
|
| area of flow of electron in a conductor | 12/3/2008 |
Q: From where the electrons flow in a conductor ?from conductor's suface or under its surface ?
A: The electrons flow throughout the interior of the conductor. That is why the resistance of a wire is ...
|
| PHYSICS 11 QUESTION | 12/2/2008 |
Q: what is the maximum acceleration a car can undergo on level ground if the static coefficient of ...
A: The only force available to accelerate a car on a horizontal surface is the force of friction. ...
|
| kinetic energy.. | 12/2/2008 |
Q: i was wondering if u can help me with these questions 1) In pool, when the cue ball hits another ...
A: When one pool ball strikes another energy is not eh only thing to consider. More importantly is the ...
|
| Electrolysis cleaning | 12/1/2008 |
Q: How/why does the electrolysis process clean corrosion off of things?
A: In electrolysis some of the metal is dissolved by the flow of current. As this metal is dissolved it ...
|
| conductors | 11/30/2008 |
Q: if there is a charge placed (not exactly in center), of a hollow spherical conductor, then how will ...
A: Any Gaussian surface surrounding the charge within the hollow spherical shell will predict an ...
|
| PHYSICS | 11/29/2008 |
Q: We know 2+2 is 4, but can physics present a working model as to how a cell upon cenception becomes ...
A: The most recent estimate is that the total mass-energy of the universe is very close to zero - and ...
|
| conductors | 11/28/2008 |
Q: if there is a charge placed (not exactly in center), of a hollow spherical conductor, then how will ...
A: No matter where the charge is placed within the conducting sphere the electric field lines outside ...
|
| PHYSICS | 11/26/2008 |
Q: We know 2+2 is 4, but can physics present a working model as to how a cell upon cenception becomes ...
A: There is no implication at all that when a cell divides that something comes from nothing. You are ...
|
| Egg drop- | 11/26/2008 |
Q: We have been asked to build a vehicle that would safely carry an egg from a height of fifty feet. ...
A: The goal in this kind of activity is to make the time of the actual collision take the longest ...
|
| buoyancy | 11/25/2008 |
Q: Does a sunken ship sitting on the ocean floor have a buoyant force on it? I'm certain this relates ...
A: The buoyant force on a submerged object is equal to the weight of the displaced liquid. For example ...
|
| Help on inclined planes | 11/23/2008 |
Q: I need some help in a physics lab report that I am writing. In our lab, we wanted to calculate the ...
A: The coefficient of friction mu would equal the tangent of the angle of the incline a ONLY if the ...
|
| Help on inclined planes | 11/22/2008 |
Q: I need some help in a physics lab report that I am writing. In our lab, we wanted to calculate the ...
A: You actually already seem to be on the right track. If a mass is to pushed up an inclined plane at a ...
|
| Flu | 11/21/2008 |
Q: Mr. James I have doubt on this question. Ive been trying this fro quite some time, but i dont know ...
A: The weight of an object is equal to the mass m of the object times the gravitational force constant ...
|
| Physics-Pressure etc. | 11/21/2008 |
Q: Hey Sir, Hope your doing alright. I have a question I need help on. I request you to please take a ...
A: Assuming that the flat side of the brick is facing down, first calculate the area of the brick in ...
|
| Magnet Powered rotation | 11/18/2008 |
Q: Referring to the previous question, you said "No such motor is possible" could you tell me what is ...
A: What is impossible is the construction of a motor [magnetic or otherwise] that is capable of ...
|
| Magnetic Motors | 11/17/2008 |
Q: I have a question - do magnetic motors - ie magnet powered motors or devices violate the laws of ...
A: I watched the video and am sorry to say that it is wishful thinking only! No such motor is possible. ...
|
| Magnetic Motors | 11/17/2008 |
Q: I have a question - do magnetic motors - ie magnet powered motors or devices violate the laws of ...
A: I am still a bit confused by your question because ALL electric motors are "magnet motors"! I ...
|
| Optics | 11/16/2008 |
Q: Sir, I'd like to know why objects light in colour radiate the light falling on them while dark ...
A: Whether or not a surface absorbs or reflects light depends on the nature of the electron orbitals in ...
|
| Magnetic Motors | 11/16/2008 |
Q: I have a question - do magnetic motors - ie magnet powered motors or devices violate the laws of ...
A: Of course not! If they did they wouldn't work. The "Laws of Physics" are NOT optional! What is it ...
|
| Water dipole | 11/15/2008 |
Q: Why is water a polar molecule / dipole with the hydrogen atoms in one end of the water molecule? I ...
A: What you are ignoring is that atoms are held together not by just an electrostatic force between the ...
|
| Physics | 11/14/2008 |
Q: A proton (m = 1.67 x 10-27 kg) traveling at 300 with respect to a 5.2 mT magnetic field lines ...
A: The magnetic force on a moving charged particle is given by: Fm=q*VxB where q is the charge of the ...
|
| force | 11/13/2008 |
Q: Where do forces come from? And can a body, in and of itself, possess a force as it possesses other ...
A: There are actually very few forces in nature: the electromagnetic [or electroweak] force - the force ...
|
| Effects of taking x-ray twice in a month or week | 11/12/2008 |
Q: What are the effects of taking x-ray twice in a month or week? What if after doing so, I experience ...
A: Unless this is a very special situation, the dose received from each xray is VERY low compared to ...
|
| Sound Phenomena and the Doppler Effect | 11/10/2008 |
Q: This is the last question for a couple of weeks, I promise =O] Bats emit sounds of frequencies ...
A: The frequency heard from a moving source and by a moving observer is given by: ...
|
| Linear Momentum and Collisions | 11/9/2008 |
Q: A projectile that is fired from a gun has an initial velocity of 90.0km/h at an angle of 60.0 ...
A: One of the alternative interpretations of momentum conservation is that in an isolated system the ...
|
| Momentum | 11/9/2008 |
Q: A pendulum consists of a mass M hanging at the bottom end of a massless rod of length l, which has a ...
A: This problem has 2 parts. In the first part momentum conservation is used to determine the velocity ...
|
| Angle of Third Class Lever | 11/8/2008 |
Q: A 1200 cm long third class lever is placed so that one end is on a flat surface (ie. the floor) and ...
A: I believe that you are ignoring the force exerted by the fulcrum acting on the lever arm. This will ...
|
| formula for lift | 11/7/2008 |
Q: I have done a hot air balloon experiment and now I'm trying to find it's lift. i have got: Lift = CL ...
A: I do not see that you actually have the lift! The lift of a balloon would be equal to the difference ...
|
| Angle of Third Class Lever | 11/5/2008 |
Q: A 1200 cm long third class lever is placed so that one end is on a flat surface (ie. the floor) and ...
A: This problem is a torque problem. From a practical point of view this means that for a system to be ...
|
| Physics - Energy/Momentum | 11/4/2008 |
Q: A 2 kg block is compressed by a spring of force constant 300 N/m by 4.5 cm. If the block-spring ...
A: The first part of this problem can be solved using the concept of energy conservation - the total ...
|
| Physics - Energy/Momentum | 11/4/2008 |
Q: A 600g basketball is moving 10m/s when it hits a blackboard at 90degrees. The ball bounces off at a ...
A: This problem uses the "impulse" equation, which is a form of Newton's 2nd Law written in terms of ...
|
| Physics | 11/2/2008 |
Q: A daredevil decides to jump a canyon of width 10 meters. To do so she drives a motorcycle up an ...
A: All two dimensional kinematics problems can be solved using the exact same procedure; identify the ...
|
| kinematic formulas | 11/2/2008 |
Q: my teacher gave me these to formulas Vf=Vi+at and deltaX(DX)=Vit+.5at^2 i am supposed to use ...
A: Start with the two kinematics equations: Df=1/2*a*t^2+Vo*t+Do and Vf=a*t+Vo Solve the velocity ...
|
| projectiles/ | 10/31/2008 |
Q: how fast must a projectile moving horizontally travel so that the curve it follows matches the curve ...
A: Turns out that there is a surprisingly easy way to solve this problem! If the projectile is to ...
|
| braking or turning? | 10/30/2008 |
Q: a car is approaching a wall at V m/s velocity, is it better to turn the car keeping the velocity ...
A: The real question is "What acceleration will be required to avoid hitting the wall?". So let's solve ...
|
| hints to solve this problem | 10/29/2008 |
Q: I'm stuck with this question so if possible I need some hints to start solving it: A light string ...
A: The tension in a string causing an object to move in a circular path is given by: Fc=m*v^2/R. In ...
|
| braking or turning? | 10/29/2008 |
Q: a car is approaching a wall at V m/s velocity, is it better to turn the car keeping the velocity ...
A: I don't think the problem can be answered the way you have asked it. It all depends on whether or ...
|
| Question | 10/28/2008 |
Q: how r ya... i having trouble with this problem. if you would please take a look at it and explain , ...
A: The momentum of the blood will have to be equal in magnitude to the momentum of the body: ...
|
| Need HElp! | 10/28/2008 |
Q: Hey Sir, I need your help real quick on this problem. I hope you can help, I tried this problem a ...
A: In a closed system the total momentum remains constant. In this case, since there are two objects, ...
|
| Physics of sound | 10/27/2008 |
Q: I'm so stuck. I just don't know where to start please help :0 What are the first four resonant ...
A: The smallest part of a sound wave that will resonate within a tube either open at both ends [an ...
|
| physics | 10/27/2008 |
Q: An airplane starts from rest and accelerates at a constant 3.10 m/s2 for 31.0 s before leaving the ...
A: All one dimensional problems of this type can be solved in the exact same way. All kinematics ...
|
| Momentum | 10/24/2008 |
Q: Hey Mr. James, I tried this problem a couple of times. I did the momentum formula and stuff, and ...
A: This problem involves center of mass. As long as there are no unbalanced external forces acting on a ...
|
| Earth and ocean | 10/23/2008 |
Q: We know that when a tank is filled with water ,the level of the water (waterlevel)is a plane(surface ...
A: I have attached a diagram that I hope will help. Each arc has the same length, but notice that for ...
|
| Tension | 10/21/2008 |
Q: I was just wondering if you could explain the concept of tension to me. Is it correct that if you ...
A: The stretch of the rope should not matter except in the sense that the rope may, if fact, have some ...
|
| Pendulum force | 10/19/2008 |
Q: I am a junior high school student and I need to have a formula that will tell me the tangential ...
A: The force exerted by the bob during a collision will depend on how long the collision takes to ...
|
| Magnet Car | 10/19/2008 |
Q: So I asked this question to another Expert, and he couldn't seem to answer. I asked whether or not a ...
A: This won't work because there is NO unbalanced acting on the car in this situation. Sure, the magnet ...
|
| physics (i think it is) | 10/18/2008 |
Q: How can you make liquid nitrogen and how come it jumps up and down?
A: Liquid nitrogen is made by using a process very similar to that which is used in an air-conditioner ...
|
| Pendulum force | 10/17/2008 |
Q: I am a junior high school student and I need to have a formula that will tell me the tangential ...
A: I assume that you don't really mean the "tangential" force at the bottom of the swing because that ...
|
| Calculation Help | 10/17/2008 |
Q: I have been asked a question which is outside my knowledge, I dont know if you can assist... There ...
A: I am making the following assumptions: that there is NO significant frictional force between the ...
|
| How much friction force must the brake apply to the rim to bring the disk to a halt in 3.0 s? | 10/16/2008 |
Q: The 2.2 kg, 40 cm diameter disk in the figure below is spinning at 380 rpm. How much friction force ...
A: This problem is a combination of two distinct different problem types: kinematics and Newton's 2nd ...
|
| Mechanical advantage | 10/16/2008 |
Q: Kovalcin, I would like to know whether Mechanical advantage could be used to generate power.Whether ...
A: Not at all! Simple machines do NOT create energy! All they do is to convert one type of energy into ...
|
| superconductivity | 10/15/2008 |
Q: i was just wondering if you knew how to get a superconductor higher off a magnetic track? Would ...
A: Even in the case of magnetic levitation trains the train only floats a centimeter or so above the ...
|
| bouyancy as a force | 10/14/2008 |
Q: i have a float a hollow cube 100mm x 30mm x 100mm deep i am using this float to close off an airway ...
A: A floating object will follow Newton's 1st Law; if a system is at equilibrium opposite forces must ...
|
| Physics, Kinematics Review | 10/13/2008 |
Q: I am having difficulty truly understanding how to solve relative motion problems? The professor ...
A: a. To head directly across the stream she must aim the boat upstream so that the component of the ...
|
| Forces of Friction | 10/12/2008 |
Q: I would like to know how to solve this problem. A block accelerates 3.1 m/s^2 down a plane inclined ...
A: Unfortunately, there is not enough information given to solve this problem as stated. Since the ...
|
| Coefficient of restitution | 10/12/2008 |
Q: If you drop a ball on the ground and calculate the coefficient of restitution as the square root of ...
A: The component of the ball's velocity parallel to the surface will not cause the ball to collide with ...
|
| black body radiation | 10/11/2008 |
Q: suppose there is a black body in a room at T temperature and the temperature of the room is T and ...
A: Assuming that the surrounding room's temperature remains constant, then your analysis is correct. ...
|
| physics-- projectiles and 2d motion | 10/10/2008 |
Q: A ball is thrown from the top of a building upwards at an angle of 46 degrees to the horizontal and ...
A: All 2 dimensional kinematics problems can be solved in the same way. First of all, any kinematics ...
|
| Coefficient of restitution | 10/9/2008 |
Q: If you drop a ball on the ground and calculate the coefficient of restitution as the square root of ...
A: The coefficient of restitution should only depend on the component of the velocity perpendicular to ...
|
| Hazards of 400 nm lasers? | 10/8/2008 |
Q: What hazards -- other than thermal burns -- does a 400-nanometer-wavelength continuous [i.e. ...
A: By definition a class 4 laser burns skin! The fact that the light is near to ultraviolet does not ...
|
| Weight and Force I think | 10/8/2008 |
Q: i read this question that Eric A Cornells (Nobel Prize Physics 2001) father teased him with when ...
A: I believe that your initial analysis is correct. In order for the bees to remain air born their ...
|
| Physics/mechanics | 10/7/2008 |
Q: Alright so we've started mechanics and I'm having trouble with alot of the practise questions we've ...
A: This problem requires the use to two separate ideas, Newton's 2nd Law, as you have already noted, ...
|
| Electric Field and Application | 10/7/2008 |
Q: What is the importance/relevance to know the electric field distribution of a electrical apparatus? ...
A: Not quite sure about the context of your question, but if the electric field in an electronic device ...
|
| Helium balloons | 10/5/2008 |
Q: Just curious about the Helium balloons in free air. I saw in 'Nat Geo - What would happen if ?'some ...
A: Keep in mind that the Helium balloon is is LIGHTER than air and so, behaves like an ice cube ...
|
| voltage across inductor | 10/4/2008 |
Q: we performed an experiment on how inductor behaves in R-L series circuit.......... the peak to peak ...
A: Since I do not know the exact circuit you are using I can't really answer you question fully. ...
|
| Boiling of water | 10/4/2008 |
Q: My question is about the changes that water undergoes as it boils. I understand that as water is ...
A: The high speed of the molecules is such that the electrostatic bond between adjacent molecules is ...
|
| simple circular acceleration physics | 10/3/2008 |
Q: So, I have a problem, here it is The rotor (the figure below) is an amusement park ride where people ...
A: When you stand along the wall in the Rotor while rotating there are 3 forces acting on you: Fg down ...
|
| Projectile Motion | 10/3/2008 |
Q: A car needs to jump a river 110 meters wide off of a ramp, if the ramp is raised 5 degrees and the ...
A: All problems of this type are solved in the same way! All freefall problems involve 6 different ...
|
| Projectile Motion | 10/1/2008 |
Q: A ball is thrown from a point 1.0 m above the ground. The initial velocity is 19.6 m/s at an angle ...
A: All 2 dimensional kinematics problems can be solved in the same way. First of all, any kinematics ...
|
| physics | 9/30/2008 |
Q: a force of 80 newtons is exerted on an object on a frictionless surface for a distance of 4 meters. ...
A: This problem requires a combination of Newton's 2nd Law [to determine the acceleration] and ...
|
| Newton's Laws of Motion | 9/29/2008 |
Q: I would like to seek your guidance on the following problem with respect to the concept of inertial ...
A: The speed of the lift [elevator in the US] will make NO difference as long as it is constant! ALL ...
|
| Newton's Third Law | 9/29/2008 |
Q: I would lke to make sure that i finally understand newtons third law. If I am pushing on a marble ...
A: What you are describing is not Newton's 3rd Law! The 3rd Law says nothing about other forces acting ...
|
| electricity | 9/28/2008 |
Q: sir i want to ask that is transformer an inductor? if it is an inductor so wh does not it blocks ac ...
A: An inductor is typically made up from a solenoid, a coil whose length is greater than its diameter. ...
|
| physics problem | 9/27/2008 |
Q: When you lift a bowling ball with a force of 82 N, the ball accelerates upward with an acceleration ...
A: To answer this question apply Newton's 2nd Law twice! According to Newton's 2nd Law, the sum of the ...
|
| Your reply on the charged Rod Question | 9/27/2008 |
Q: Hey, someone asked the following question and you kindly answered in detail, yet, i couldnt ...
A: The linear charge density is, as you have noted, equal to the charge divided by the length. But in ...
|
| ELECTRIC CIRCUITS | 9/26/2008 |
Q: SIR , WE DEFINR ELECTRIC CURRENT AS THE " RATE OF FLOW OF ELECTRONS " . MY QUESTION IS THAT ...
A: The flow of electric current actually falls into to different types: drift velocity and propagation ...
|
| Friction | 9/24/2008 |
Q: When a block rests on a truck that is moving with uniform velocity, the block also moves with the ...
A: The underlying assumptions of this problem are not correct as stated. If a truck is moving down the ...
|
| Magnetism | 9/23/2008 |
Q: 1) How do you determine whether the magnetic force will go into or out of page? What does it mean ...
A: The thing that is special about magnetic fields is that the force exerted on a charged particle ...
|
| gravitation | 9/21/2008 |
Q: why is the gravitational potential enrergy of a body on mass m the surface of earth in the ...
A: Since we expect that "universal gravitation" will be applicable everywhere in the universe we have ...
|
| LHC | 9/20/2008 |
Q: I have read on the CERN website that black holes produced in the LHC could settle in the earths core ...
A: I don't know where you read this about mini black holes, but this is not, to the best of my ...
|
| with concept of physics | 9/20/2008 |
Q: Is the torque changed when a partner on a seesaw stands or hangs from herend instead of sitting? ...
A: How you sit or stand on the see-saw does NOT affect the torque exerted. What does matter is WHERE ...
|
| Relative sizes of nutrino and quark | 9/19/2008 |
Q: According to current theory, which is larger: a neutrino or a quark? Many thanks, Steve
A: "Size" may not be the right word, however, quite clearly the total mass-energy of a quark is MUCH ...
|
| momentum | 9/17/2008 |
Q: Which should be the best on knocking the bear down- a lead bullet or a rubber bullet with the same ...
A: Because the density of the lead bullet is greater than the rubber bullet, its cross section will be ...
|
| small electromagnets | 9/14/2008 |
Q: I have a question about electromagnets I was wondering if you could help me with. How small can an ...
A: They can be any size you want. The only real limit is how small of a coil can you turn. Small is ...
|
| gravitation | 9/13/2008 |
Q: sir few questions on gravitation 1) the gravitational force is inversly proportional to the ditance ...
A: 1. Your analysis is correct. 2. It does! But the distance moved by the earth is infinitesimally ...
|
| Falling Objects (neglected air resistance) | 9/13/2008 |
Q: I am a High School student taking a Physics course. I am stuck in the following question and would ...
A: All one dimensional kinematics questions can be solved in the same way. There are 6 possible ...
|
| Visible Neutrino Collisons | 9/11/2008 |
Q: I am aware that neutrinos can be detected when there is a collison with a regular particle, and a ...
A: What is possible and what is likely are very different! The likelihood that you would be looking in ...
|
| Holograms | 9/11/2008 |
Q: I had an interest in the technology of making holograms of very large areas (outdoors in ...
A: I am certainly no expert in all phases of holography, but I do know the basic process. In a typical ...
|
| Particle accelerators | 9/10/2008 |
Q: In light of recent global news, my question is:- The particle accelerator being used in France to ...
A: The accelerator at Cern has been upgraded with new superconducting magnets and many other parts ...
|
| friction | 9/9/2008 |
Q: sir we were doing this practical in physics of finding the coeeficient of static friction using an ...
A: Theoretically, the angle at which the object slides down the incline depends ONLY of the angle of ...
|
| Physics | 9/9/2008 |
Q: Suppose 0.6 cubic meter of oil is spilled into the ocean. Find the area of the resulting slick, ...
A: Treat the oil slick as if it were a pancake where the volume of the pancake would be equal to the ...
|
| Physics: thermodynamics | 9/8/2008 |
Q: I'm having to do a project on thermodynamics and I was wanting to know; is there thermodynamics on a ...
A: I wouldn't use a roller coaster as an example of the application of thermodynamics. Sure there is ...
|
| Mechanics: Motion | 9/6/2008 |
Q: I had trouble figuring this question out...The answer is supposed to be 5kg but I keep getting 7 kg ...
A: Intuitively! If the body is accelerating upward with an acceleration of 4m/s^2 the effective ...
|
| electrons slow down | 9/3/2008 |
Q: Apparently the motion of an electron around an atom nucleus resembles an endless motion. In other ...
A: I know this won't be very helpful, but our model of electrons asserts that electrons, like all ...
|
| alternating current in houses | 9/2/2008 |
Q: If the electricity current delivered to our houses is an alternating current it should reverse its ...
A: The "hot" wire in a circuit is the source of the force [EMF] that pushes and then pulls the ...
|
| Physics | 9/2/2008 |
Q: How do i calculate the gravitational force between the earth and the moon. F= G m1m1/d2
A: As you have already noted, the force between two masses, m1 & m2, is given by: Fg=G*m1*m2/r^2 where ...
|
| balance and torque | 8/21/2008 |
Q: i want to ask 1) when we sit on bicycle or a two wheeler which is not parked on its stand, and our ...
A: 1. When a bicycle is moving, the wheels are rotating. Rotating wheels have a physics quantity known ...
|
| physics | 8/21/2008 |
Q: A girl is playing tennis against a wall. She hits hte tennis ball from a height of 0.5m above the ...
A: All 2 dimensional kinematics problems of this type can be solved in the exact same way. First of ...
|
| Quick high school physics question | 8/20/2008 |
Q: I just have a quick question from my high school AP Physics class. I know it is an easy problem and ...
A: Your difficulty here is caused by the fact that you are asking the wrong question! The real question ...
|
| gravitation | 8/18/2008 |
Q: 8 m/s^2) if the earth starts rotating faster around it's axis and if it stop rotating?sir please ...
A: The acceleration of gravity at the Earth's surface will, in general, be unaffected by the rotational ...
|
| help | 8/15/2008 |
Q: a bullet is fired from a rifle, emerging from the muzzle at 340 meters per seconds. it strikes a ...
A: I would use kinematics to solve this problem. Since the bullet has lost 10% of its velocity, its ...
|
| Maxwell Equations changed E and B fields | 8/11/2008 |
Q: Based on what I've read about Electromagnetic waves is that a changing Magnetic (B) field causes a ...
A: The magnetic field is determined NOT by the magnitude of the electric field, but by the RATE OF ...
|
| bicycle sprockets | 8/10/2008 |
Q: Last year I bought a new 17 speed bicycle and have made good use of it. Some of the roads and ...
A: Sorry, but things will not work out the way you envision. The purpose of either the sprocket system ...
|
| Momentum and collision question | 8/9/2008 |
Q: I hope you can help me find the proper simple equation that can help my students find the following ...
A: Let me try to answer this question using a different set of numbers. Let's assume that the ...
|
| physic -- friction | 8/8/2008 |
Q: What is the direction of friction acting on a ball rolling in clockwise direction? ANSWER: In ...
A: If the ball is rolling towards the right on a level, horizontal surface, the frictional force on the ...
|
| Relativity | 8/8/2008 |
Q: So a rocket is traveling at a constant speed of from above half to the actual speed of light. From ...
A: Not at all! For a moment let's assume that the two rockets are heading in opposite directions at ...
|
| physic -- friction | 8/7/2008 |
Q: What is the direction of friction acting on a ball rolling in clockwise direction?
A: In general the frictional force will tend to act opposite to the direction of motion of the ball as ...
|
| centre of mass | 8/5/2008 |
Q: sir can you please explain me what is meant by centre of mass and how is it different from centre of ...
A: The center of mass is that one point on an object where a single force can be applied to that object ...
|
| please help me to answer this problem | 8/4/2008 |
Q: 23.0) a closed system containing a gas undergoes a reversible compression process in which the ...
A: In a constant pressure problem the work done is equal to the pressure times the change in volume: ...
|
| please help me to answer this problem. | 8/3/2008 |
Q: 18.0) a 1600-kg car is stopped at5 a traffic light proceeding in direction up a 15 degree hill. The ...
A: Average power is equal to the work done divided by the time required to do the work. In this case ...
|
| please help me to answer this problem. | 8/3/2008 |
Q: 17.0) if a car produces 21 kW when moving with a velocity of 60 km/hr. determine a) the resisting ...
A: Power is equal to the product of force and velocity: P=F*v That means that in this case the ...
|
| Negative VelocitY? | 7/13/2008 |
Q: To whom it may concern, Some time after I graduated high school I was at work and bored so I ...
A: There is a perfect video on you tube that addresses this question exactly at ...
|
| angular momentun | 7/10/2008 |
Q: I think I understand the conservation of angular momentum but need clarification on a particular ...
A: The only issue here is whether the torque causing the orbiting planet to change its angular velocity ...
|
| Potential Energy | 7/5/2008 |
Q: A student lifts a 10N box one meter above the floor, walks 10m with the box and then sets it down ...
A: The answer is zero! Gravitational potential energy depends on only 3 things: the acceleration of ...
|
| Physics-Matching | 7/3/2008 |
Q: 1.motion 2.chemical 3.rate of doing work 4.unit for power 5.unit for work A.joule B.watt C.potential ...
A: 1. Effort is the force put into the machine. Given in this problem. 2. The IMA is equal to the ratio ...
|
| Physics True or False | 7/2/2008 |
Q: 1.Teflon,soap,and graphite are all lubricants. 2.tires are designed to increase rolling friction and ...
A: 1. True - All three substances are designed to reduce the frictin between two surfaces. 2. False - A ...
|
| Physics True or False | 7/1/2008 |
Q: 1. Wind has the ability to do work 2.if you push hard against a wall, you are doing work 3. THe ...
A: In order for work to occur in the physics sense two conditions MUST be met: a force must be applied ...
|
| electricity | 6/30/2008 |
Q: sir, recently i came across the thevenins theorem and nortons theorem i cdnt understand what is a ...
A: A constant current source means exactly what it says - the current output will remain constant no ...
|
| step down and step up pulley | 6/30/2008 |
Q: I have a motor that turns at 1700rpm and I need a pulley to increase the rpm to around 10000. the ...
A: The angular velocity will be inversely proportional to the radii of the 2 pulleys. The linear ...
|
| Projectile Motion | 6/27/2008 |
Q: I am stumped by this seemingly simple physics problem. I have looked around a lot on the web, but it ...
A: Actually, this problem and virtually ALL two dimensional problems of this type can be solved in the ...
|
| sound and pitch? | 6/25/2008 |
Q: .. I have a couple of problems that I need help solving and was hoping you can help me. 1. how do ...
A: 1. For an open tube, resonance will occur when the length tube is any integer multiple of 1/2 ...
|
| pressure of a knife | 6/23/2008 |
Q: I read that a knife cuts with a 1000 pounds/square inch. I'm not sure what that means since the edge ...
A: Suppose that you took a pin whose time was a circle with a diameter of 1/100 of an inch. In this ...
|
| physic - cooling | 6/22/2008 |
Q: If I were to place a tube between the water supply to the swamp cooler and the swamp cooler, having ...
A: It would be cooler and this is the reason for using ground source water for cooling when practical. ...
|
| RC Circuits | 6/16/2008 |
Q: what are the equations to find the voltage across a resistor and capacitor of a RC Circuit in ...
A: The current through [not across] circuit elements in series will be constant because, of course, ...
|
| RC Circuits | 6/16/2008 |
Q: what are the equations to find the voltage across a resistor and capacitor of a RC Circuit in ...
A: Assuming that you start with an uncharged capacitor and you close a switch in series with the ...
|
| PHYSICS: RC Circuits | 6/15/2008 |
Q: what are the equations to find the voltage and capacitance of a RC Circuit in series? The circuit ...
A: You will need to connect the capacitor in parallel with a resistor and led connected in series. The ...
|
| Physics | 6/14/2008 |
Q: Kovalcin, I am wondering about the behaviour or fluids such as water of fuel in the back of ...
A: If the truck is freely accelerating down a hill not much would happen at all - I would expect the ...
|
| electrical | 6/12/2008 |
Q: A 100 W, 200V bulb is connected to 100 V supply. what will be the wattage?
A: Since this bulb is rated at 100 watts at 200 volts and since power equals voltage squared divided by ...
|
| Magnet only pushes in one direction | 6/10/2008 |
Q: http://www.youtube.com/watch?v=xb8wwkdtz0M Can you explain this ?
A: It is difficult to tell exactly what is going on, but let me make several points. 1. There is no way ...
|
| about electric field | 6/9/2008 |
Q: show that of a charged particle in a transverse uniform electric field is parabolic
A: If a charged particle moved horizontally through a vertically oriented electric field the resulting ...
|
| kinetic energy | 6/9/2008 |
Q: I am shown a graph as described: left - Force (N) bottom - Displacement (m) The graph starts at 0 ...
A: The kinetic energy gained by the object will be equal to the work done. [This is called the ...
|
| units | 6/8/2008 |
Q: Sir few very basic questions related to units in meausrement as we hav been introduced to units in ...
A: One of the key issues of the metric system is to provide units that can easily be determined by any ...
|
| Electricity | 6/6/2008 |
Q: Please trace the flow of electrons from the stepdown transformer at the pole outside my house to the ...
A: First of all, electrons do NOT flow from the pole into your house and back to the pole at all! All ...
|
| Ask Heat Transfer Question | 6/6/2008 |
Q: I have 3000L hot water with temperature 90 Celcius in a tank with cap. 4000L. I put 50 mm thick ...
A: Sorry, I hit the wrong button. As stated I can't figure out what the question is. Please check your ...
|
| magnetism | 6/4/2008 |
Q: A DC current flows in a stright wire,a magnetic field is generated aroung its axis according to the ...
A: A DC current would NOT produce an electric field! An AC current WOULD generate an electric field! ...
|
| Newton/Einstein in relation to space travel | 6/4/2008 |
Q: James A fine bottle of whiskey depends upon your answer.:) My friend and I were debating gravity ...
A: As far as I know Relativity Theory is not necessary to predict common trajectories for satellites ...
|
| I need help Physics is killin me | 6/3/2008 |
Q: Here is a questions I need help with: Tarzan, mass 85kg, swings from a tree on the end of a 20m ...
A: This is a problem involving the conservation of energy. In a closed system [a system in which there ...
|
| electrostatics? | 6/2/2008 |
Q: a girl with long(50cm) hair touches the van de graaf generator at a science museum and her hair ...
A: I am having a little bit of difficulty picturing exactly what is happening. If I really do ...
|
| Net force | 6/1/2008 |
Q: I need a little help understanding a homework problem: a car is driving down the road at a constant ...
A: For a car going down the highway at a constant velocity, the UNBALANCED force acting on the car must ...
|
| LEDs and electricity. | 5/31/2008 |
Q: i have a question about electricity and LEDs. I wish to know if there is anything similar to the ...
A: One important factor that should be taken into consideration when using an LED; they must always be ...
|
| physics: force | 5/30/2008 |
Q: I have done this problem up to a certain point but am confused as to how to finish it. Cathy takes ...
A: May I suggest that you look at the problem somewhat differently? In order to accelerate the cake ...
|
| Changing shadow sizes - 3rd grade | 5/27/2008 |
Q: In a third grade activity students are to make a shadow on the wall using an object (tongue ...
A: It should not matter whether you move the light or the tongue depressor. What will matter, however, ...
|
| pressure | 5/27/2008 |
Q: Why do we call pressure a scalar quantity when we know that pressure is force per unit area and ...
A: In order for a quantity to be a vector quantity there must be a unique direction for that quantity ...
|
| physics-waves | 5/24/2008 |
Q: the waves from a radio station van reach a home receiver by two paths. one is a straightline path ...
A: In order for the direct wave and the reflected wave to produce destructive interference at the ...
|
| Help! | 5/22/2008 |
Q: How long will it take a rock dropped from 2.0 above the surface of Mars to reach the ground?
A: Do you mean 2 METERS above the ground? If so this is like any other freefall problem except that the ...
|
| electromagnets | 5/20/2008 |
Q: I am looking to build a pretty strong electromagnet. A: how do I go about it, B: how strong can an ...
A: The strength of any electromagnet that you make will be determined by two factors: the design of the ...
|
| Electronics: Resistors | 5/20/2008 |
Q: Kovalcin, I want the equivalent resistor of the following. Please tell me that with explanation. ...
A: As I understand this circuit it is essentially: two 1 ohm resistors in parallel in series with an ...
|
| why should we spend time in the sun? | 5/15/2008 |
Q: why should we spend time in the sun?
A: The most important reason for spending time in the sun is probably the generation of vitamin D by ...
|
| hooke's law | 5/13/2008 |
Q: A 5000 kg truck drives over a pothole in the road that causes the truck to push down on all four ...
A: The required concept here is, as the problem states, energy conservation. In this case the change in ...
|
| force | 5/12/2008 |
Q: helo sir i hav some doubt related to reaciton force. suppose i hold a chalk on my hand out ...
A: Your problem here is the meaning of "reaction force". The reaction force to the stone's weight is ...
|
| Can we jump further from west to east? It is not so simple a qustion | 5/11/2008 |
Q: We knew from our high school teachers that we may jump for the same distance whether we jump from ...
A: Much [but not all] of what you say it true, but what you are ignoring is that this effect you are ...
|
| conservation of momentum | 5/10/2008 |
Q: As most know if a rotating object (a skater for instance) maintains it's mass but decreases its ...
A: For a rotating object, such as a spinning ice skater, the product of the "moment of inertia" and the ...
|
| tennis | 5/9/2008 |
Q: do you have any info about what physics has to do with tennis ANSWER: Physics topics related to ...
A: When you strike a tennis ball the path followed by the tennis ball as it moves through the air is ...
|
| tennis | 5/8/2008 |
Q: do you have any info about what physics has to do with tennis
A: Physics topics related to tennis: momentum conservation, impulse, Newton's 2nd Law, 2 dimensional ...
|
| frequency/current | 5/7/2008 |
Q: A circular coil of diameter 8 cm and consisting of 1000 turns is rotated in a 0.2 Tesla magnetic ...
A: When the normal to the plane of the coil is parallel to the magnetic field [in other words, when ...
|
| Orbits | 5/6/2008 |
Q: In Newton's time, the distance between the earth and the moon was known to be about 60 times the ...
A: The orbit of a satellite can be predicted from Newton's 2nd Law. For a satellite orbiting the earth ...
|
| intereference of electromagnetic waves | 5/6/2008 |
Q: do em waves of same or different frequencies interfere with each other? if not then i would like to ...
A: The answer to the question is that interference is a transient effect! What does that mean? It means ...
|
| Sound | 5/5/2008 |
Q: A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 2.0 s ...
A: Since the echo from one wall was after 2 seconds, the distance to this first wall must be ...
|
| Electrostats | 5/4/2008 |
Q: what is the difference between electrostatic potential and potential difference?
A: Generally, "electrostatic potential" refers to the electrostatic potential at a point relative to ...
|
| The metre | 5/2/2008 |
Q: I understand that the metre is defined as the length of the path travelled by light in a vacuum ...
A: We sometimes have to live with legacy decisions! Sure, we could define the speed of light as you ...
|
| Oscillatory motion | 5/2/2008 |
Q: A man is found dead hanging at abouth the 7th story level from a bungee chord tied at the top of the ...
A: If the assumption here is that the jumper was expecting to commit suicide by colliding with the ...
|
| frequency/velocity or a Ion | 5/1/2008 |
Q: An unknown ion is accelerated through a potential difference of 10,000 volts and then enters into a ...
A: The effect of a uniform magnetic field will be to cause the charged particle to move in a circular ...
|
| Physics | 4/30/2008 |
Q: How much tension must a rope withstand if it is used to accelerate a 960-kg car horizontally along a ...
A: If the elevator is accelerating upward the cable must be able to BOTH support the weight of the ...
|
| Symmetrical arguments supporting validity of clock-paradox in SR | 4/30/2008 |
Q: Suppose we have 2 identical, synchronized clocks (C1 and C2))accelerating away from each other, ...
A: From what I understand about the Special Theory of Relativity, the problem here is that your thought ...
|
| egg vehicle | 4/29/2008 |
Q: My physics class has been assigned a project where we must create a vehicle that will transport an ...
A: Attach the end of the stretched spring to a string which is, in turn, wrapped around the axle of the ...
|
| Oscillatory motion | 4/28/2008 |
Q: What would be the natural oscillation period of a 30 kg child on a swing whose seat is 3.2 m below ...
A: A child sitting on a swing is, for all practical purposes, a simple pendulum. The period T of a ...
|
| physics | 4/27/2008 |
Q: if a Coulumb of electrons is passing through a load, how does the resistance in the load affect the ...
A: The resistance of a load is determined by the degree of interaction between the moving charges and ...
|
| Physics Q's | 4/27/2008 |
Q: with? 1.) Give Neils Bohr's explanation for the existence of Hydrogen spectral lines? 2.) The speed ...
A: 1. Bohr looked at orbiting electrons as being like planets orbiting the sun. This model did not ...
|
| mecanics | 4/26/2008 |
Q: In which of the following unit acceleration expressed ?
A: Acceleration is defined to be the rate of change of velocity and is calculated by dividing the ...
|
| projectile motion | 4/25/2008 |
Q: Ive been having trouble with this question. Three shells are fired that will simultaneously land ...
A: All 2 dimensional problems of this type can be solved in the same way: break the problem into 2 ...
|
| should we spend time in thesun? | 4/24/2008 |
Q: could you please answer these questions beacsue im really stuck in my school work! Should we spend ...
A: There are a number of points on both side! Con 1. Causes skin cancer! This become all too common ...
|
| bowling ball dropped on an egg experiment | 4/21/2008 |
Q: How can I prepare a raw egg to survive having a bowling ball dropped on it? The egg has to be ...
A: How about using spray can insulating foam [polyurethane - available at Home Depot]? It will harden ...
|
| unifrom motion | 4/20/2008 |
Q: "Rotor" is a ride found in the amusement parks that consist of a hollow cylindrical room( about 8 ft ...
A: This is a Newton's 2nd Law problem; the sum of the forces in the direction of the acceleration must ...
|
| physics | 4/19/2008 |
Q: http://en.wikipedia.org/wiki/Image:Wheatstonebridge.svg Using the link provided for the diagram. ...
A: Using the loop rule 3 times where I1 is the current through R1, I2 is the current through R2, Ib is ...
|
| Egg drop | 4/18/2008 |
Q: James, i have a question regarding the physics of an egg drop. I am not sure about the 2nd law but I ...
A: The third law just says that the force exerted on the egg by the ground when it strikes the ground ...
|
| Physics | 4/18/2008 |
Q: What does a negative displacement mean? What does a negative velocity mean?
A: The answer to both of these questions is arbitrary! You get to decide although in some cases we ...
|
| length vs. period | 4/17/2008 |
Q: I did a lab in my classroom about the length of the pendulum affect its period. the length and the ...
A: The problem here is that you need to square the period T^2 not the length if you want to straighten ...
|
| Water Pressure Loss Due to Pipe Size Reduction | 4/15/2008 |
Q: Mr. Kovalcin, I'm a little rusty on my physics and I'm not sure how to puzzle this out and show a ...
A: The answer here is quite simple! It was a terrible idea to change the 1.25" line to a 0.75" line. ...
|
| Potential/kinetic energy | 4/15/2008 |
Q: We're learning about potential and kinetic energy in 3rd grade. I understand that an apple on a ...
A: The problem here has to do with the reference point being used. It is frequently quite convenient to ...
|
| Potential/kinetic energy | 4/14/2008 |
Q: We're learning about potential and kinetic energy in 3rd grade. I understand that an apple on a ...
A: After the apple falls it has lost its potential energy and converted into another form. Just as the ...
|
| Energy | 4/14/2008 |
Q: Kovalcin, I have been doing some reading on energy, and I have found an interesting point: If ...
A: It is possible for two generators producing two identical sinusoidal signals that are EXACTLY 1/2 ...
|
| Physics | 4/4/2008 |
Q: By what factor should the length of a simple pendulum be changed in order to triple the period of ...
A: The period of a simple pendulum is given by: T=2*pi*sqrt[l/g] where T is the period of the pendulum, ...
|
| Waves | 4/4/2008 |
Q: 1. The intensity of a sound source is 67 dB's when 4 meters from the source. What is the intensity ...
A: 1. The intensity of a sound is inversely proportional to the distance from the sound source ...
|
| Physical S. | 4/2/2008 |
Q: 10 grams of iron has a temperature of 190 Fahrenheit. 100 grams of water has a temperature of 60 ...
A: Because of energy conservation, the heat energy gained by the water must be equal to the heat energy ...
|
| Sound and Electromagnetism | 4/1/2008 |
Q: How does sound relate to electromagnetism, if at all? Would 20Hz of sound be in any way equivalent ...
A: No relationship at all with the exception that both phenomena are waves. That said, they are very ...
|
| force | 3/31/2008 |
Q: sir A rocket is moving with constant speed in space by burning fuel and ejecting out burnt gases ...
A: The momentum of the rocket plus its fuel will be constant. If you eject fuel out the rear of the ...
|
| Rotational motion | 3/31/2008 |
Q: What is the formula for calculating the acceleration and velocity of the rolling body down an ...
A: The easiest way to determine the acceleration and corresponding velocities of an object rolling down ...
|
| electromagnetics and electrostatics | 3/30/2008 |
Q: iv got a probelm i need help solving regarding the above subject,your help would be much ...
A: The electrostatic force between two charges is given by: Fe=k*q1*q2/r^2 where k is the electrostatic ...
|
| Light's gravity and black hole mass | 3/30/2008 |
Q: Two questions: [1] I've read that photons exert a (tiny) gravitational effect. (I don't refer here ...
A: 1] According to Special Relativity mass and energy are just different aspects of the same thing ...
|
| Hall Probe Physics Question | 3/25/2008 |
Q: A Hall probe is constructed from a semi-conducting material of thickness 0.4 millimeters. When 5 ...
A: A Hall Effect probe works because an external magnetic field acts on the moving charged particles ...
|
| magnetic field question | 3/25/2008 |
Q: 4. An electron is forced to undergo uniform circular motion with a radius of 5 cm and a period of ...
A: The magnetic force acting on a moving charged particle is always directed perpendicularly to the ...
|
| Ice Crystals | 3/24/2008 |
Q: This is mywhy is in the middle of ice, white ? (have you noticed ?) I guess the reason must be ...
A: To make truly clear ice requires extreme pressure. Interestingly, it is this transparency under ...
|
| pleeeeaaaaaaaaaaaasssseeee help! | 3/24/2008 |
Q: 20.Balance scales measure a mass of 90 kg for a person and an apparent mass of 3.7 kg when submerged ...
A: The mass of water is approximately [approximately because this depends on temperature to a small ...
|
| physics heat/wavelengths | 3/23/2008 |
Q: 1. All matter contains both positively and negatively charged particles. Why do most things have no ...
A: 1. Since opposite charges attract, in most cases positives and negatives cancel out on average. ...
|
| question | 3/22/2008 |
Q: can you answer this question : "A bus is moving downhill at a slope of 5 degree on a rainy day. At ...
A: Virtually all kinematics problems can be solved in the same way! There are 6 variables relevant to ...
|
| Newton's laws | 3/20/2008 |
Q: If one looks at the planet Venus through even a small telescope, one sees that sometimes it looks ...
A: The only time that Venus will look full to us is when it is on the opposite side of the sun. Why? ...
|
| Acceleration | 3/19/2008 |
Q: I am currently studying an undergraduate sports mechanics course in which we're still trying to ...
A: Virtually all kinematics problems can be solved in the same way! There are 6 variables relevant to ...
|
| Newton's Law | 3/18/2008 |
Q: Two friends push on a 2200 kg car. The car is initially at rest, but after pushing on it for about ...
A: According to Newton's 2nd Law the sum of the forces acting on an object is equal to the product of ...
|
| addition to the plasma ball question | 3/18/2008 |
Q: How is a plasma ball related to well-known plasma sources...like the plasma in the sun, in plasma ...
A: A plasma ball consists of a low pressure gas [the type of gas determines the color of the glow], two ...
|
| Time - given acceleration and distance | 3/16/2008 |
Q: I have been examining a text book example question for hours on end, and though the answer is given ...
A: Believe it or not ALL kinematics problems can be solved in exactly the same way! There are only 6 ...
|
| Physics Q's | 3/14/2008 |
Q: help. 1.) A car traveling 20 mph can stop in about 40 ft. If the same car travels twice as fast, ...
A: 1. If the car travels twice as fast it will contain 4x as much kinetic energy [KE=1/2*m*v^2] and so ...
|
| Fluid mechanics | 3/13/2008 |
Q: I'm confused about some concepts about fluid motion. Putting a nozzle on a hose will increase its ...
A: There are two relevant issues here, both of which you have hinted at. First, the law of continuity ...
|
| Syphons | 3/13/2008 |
Q: Can you tell me please: In a syphon setup, why does the opening of the outlet pipe HAVE to be lower ...
A: Actually, the weight of the liquid on the output side must be LESS than the weight of the liquid on ...
|
| Simple Harmonic Motion | 3/12/2008 |
Q: How do you prove shock absorbers (springs) is SHM
A: I am not quite sure what you mean by "prove" in this context. It is true that the suspension system ...
|
| physics | 3/10/2008 |
Q: 33. A 500 kg car is traveling at 20 m/s. It applies the brakes doing to dodge a squirrel doing ...
A: The easiest way to solve this problem is to use energy conservation. The initial energy of the car ...
|
| Lightning | 3/9/2008 |
Q: Is there any instrument for measuring the temperature of lightning? if so what is the material used ...
A: I don't know if such a device actually exists, but in principle such a device is quite ...
|
| Heat | 3/7/2008 |
Q: A 3 kg rock is initially at rest at the top of a cliff. Assuming that the rock falls into the sea at ...
A: Using energy conservation, the gravitational potential energy of this falling rock will be equal to ...
|
| Heat | 3/7/2008 |
Q: A hot-water heater is operated by solar power. If the solar collector has an area of 6 m^2 and the ...
A: Just look at the units! Dividing 550J by 3300J/s becomes J/[J/s] = J*s/J = s Seconds, the unit for ...
|
| Heat | 3/5/2008 |
Q: A hot-water heater is operated by solar power. If the solar collector has an area of 6 m^2 and the ...
A: The heat needed to raise the temperature of one cubic meter of water from 21oC to 61oC is given by Q ...
|
| Momentum and Collisions | 3/5/2008 |
Q: An 85 Kg astronaut is working on the engines of a spaceship that is drifting through space with a ...
A: Using momentum conservation, the momentum of the wrench will be equal to the momentum of the ...
|
| temperature | 3/4/2008 |
Q: An average residential swimming pool might contain 15,000 gal. About how much energy would it take ...
A: The heat needed to raise the temperature is given by Q=m*c*DT where Q is the heat added, m is the ...
|
| physics and wheels | 3/3/2008 |
Q: I am helping my 5th grader w/ a science fair project and am having trouble finding research that ...
A: In the absence of some special consideration I do not believe that it should really matter very much ...
|
| Applying Newton's Laws of Motion | 3/2/2008 |
Q: a 4000 kg truck is parked on a 15 degree slope. how big is the friction force on the truck?
A: Since the truck is NOT accelerating this must be a Newton's 1st Law problem. All problems of this ...
|
| Newton scooter | 3/2/2008 |
Q: I need to make a newton scooter only using newtons 3rd law that will carry a cup of water and move 2 ...
A: That would be entirely up to you! Use your imagination? You could get one of those cheap battery ...
|
| Newton scooter | 3/1/2008 |
Q: I need to make a newton scooter only using newtons 3rd law that will carry a cup of water and move 2 ...
A: In order to make this a "Newton's 3rd Law" scooter you will have to throw or eject something ...
|
| statics | 2/28/2008 |
Q: a rod of wheight 5 N and length 2M is supported by three chords A,B and C it in turn supports a ...
A: I could be wrong, but based on the problem as stated I believe that there are too many variables and ...
|
| Physics | 2/26/2008 |
Q: How can we relate Vectors with scalars eg:in the relation V = (integral of)E vector * ds Vector ...
A: There are two different types of fields: scalar fields and vector fields. A field is an area of ...
|
| ac dynamo | 2/25/2008 |
Q: sir how is steady emf obtained from a fluctuating emf in an ac dynamo?
A: A feedback mechanism controls to output of the generator. This can be done in a number of different ...
|
| miscellanoues | 2/23/2008 |
Q: sir i wanted to ask few questions thought it is not of your subject expertise but i think you would ...
A: 1. A spring balance will typically not be sensitive enough to weigh such a valuable substance - more ...
|
| electric current | 2/22/2008 |
Q: James, my question is that what are the the few points that differ emf from pd(potential difference)
A: Potential difference is a measure of the difference in potential energy that a positive charge will ...
|
| electricity production | 2/21/2008 |
Q: Give me a technique of production of electricity at no cost in detailed knowledge.
A: There is just no way to produce electricity at no cost in any useful amount! If such a thing was ...
|
| general physics | 2/21/2008 |
Q: A small ball rolls around a horizontal circle at height y inside a frictionless hemispherical bowl ...
A: The ball in this problem is moving in a circular path and is, therefore, accelerating centripetally. ...
|
| physics -circular motion | 2/18/2008 |
Q: A 1500. kg car takes a 50.0 m radius unbanked curve at 15.0 m/s. What is the size of the friction ...
A: Since this car is accelerating [centripetally in this case] Newton's 2nd Law applies. The 1st step ...
|
| The Work-Energy Theorem and Kinetic Energy | 2/17/2008 |
Q: An extreme skier, starting from rest, coasts down a mountain that makes an angle 25.0° with the ...
A: The easiest way to solve this problem would be to use energy conservation. The skier starts at the ...
|
| What exactly are "flames"? | 2/16/2008 |
Q: What exactly are "flames"? From what I've read about, it's where atoms are rearranging, with a net ...
A: Energy release in the situations you have described is the result of a decrease in electrostatic ...
|
| blocking of magnetic field | 2/14/2008 |
Q: "fello sir", Is there existance of plate of any material which can block the magnetic ...
A: The only material I know of that can completely block the passage of a magnetic field is a ...
|
| Physics | 2/13/2008 |
Q: 1. Why does an iron core increase the magnetic induction of a coil of wire? 2. Why is a generator ...
A: 1. Microscopic "magnetic domains" within the iron core [like tiny little atomic level magnets] ...
|
| cathodes | 2/11/2008 |
Q: okay, let me see if i understand a cathode correctly. a cathode is an electrode. the way that this ...
A: A cathode is a negatively charged object that is a source of electron flow [typically through a gas ...
|
| space motion | 2/10/2008 |
Q: An astrounat repairing a communications satellite in deep space floats at rest with respect to the ...
A: Using momentum conservation! Assuming that the astronaut is 22m from the air lock, is facing away ...
|
| Physics projectile motion | 2/8/2008 |
Q: In a test of a new missile defense system, a missile is fired on a trajectory that would directly ...
A: This is a center of mass problem [which of necessity ignores innumerable real world effects] where ...
|
| MAGNATIC | 2/7/2008 |
Q: SIR WHY A MAGNATIC ATTRECT A PIECE OF IRON?
A: Ferro magnetic materials [such as iron, nickel, etc] have microscopic particles within them where ...
|
| mickelson morleys experiment | 2/6/2008 |
Q: my question is about mickelson morleys experiment. i want to know if they find out from their ...
A: It it true that for hundreds of year this topic was the center of much debate, but when Young ...
|
| Physics | 2/6/2008 |
Q: 1. In what sense are all magnets electromagnets? 2. All atoms have moving electric charges. Why, ...
A: 1. All magnetism is the result of moving charged particles, usually this means electrons. In a ...
|
| magnetic physics | 2/5/2008 |
Q: At New York City, the earth's magnetic field has a vertical component of 5.2 10-5 T that points ...
A: The magnetic force on a current carrying wire is given by Fm=I*LXB where X is the cross product of L ...
|
| physics | 2/3/2008 |
Q: A 1kg ball is hung at the end of a rod 1m long. The system balances at a point on the rod 0.25m ...
A: The center of mass of any system can be found by multiplying the mass of each piece of the system by ...
|
| kinematic equations | 2/2/2008 |
Q: i wanted to know how the kinematic equations were derived. Vf = Vi + at Vf^2 = Vi^2 + ...
A: In my classes students develop these equations in the laboratory. What my students do is take a ...
|
| Angular motion | 2/1/2008 |
Q: when you make a flip turn in the water, how can you calculated the angular acceleration of the ...
A: Angular acceleration will be equal to the change in angular velocity divided by the time required ...
|
| Drag Force | 1/31/2008 |
Q: I know that the drag forces in water are complicated. I found this equation about buoyancy force and ...
A: I wouldn't think so. That doesn't make any sense to me. Forces are vector quantities and direction ...
|
| Physics problem | 1/30/2008 |
Q: A balloon is rising vertically upward with a velocity of 5.6 m/sec releases as an object from the ...
A: All kinematics problems of this type can be solved in the exact same way. First, identify each of ...
|
| physic of swimming | 1/30/2008 |
Q: i have read your answer about the basic physic of swimming.i know those are basic stuff of physic.I ...
A: Whether or not something floats is based on Newton's 1st Law; if a system is at equilibrium opposite ...
|
| Physics | 1/29/2008 |
Q: 1. One example of a water system is a garden hose that waters a garden. Another is the cooling ...
A: 1. An electric circuit is more analogous to the cooling system in a car. The same electrons cycle ...
|
| help!!! | 1/28/2008 |
Q: A rock is tied to the end of a 35cm long string and whirled around in a circlee that describesa ...
A: This is a Newton's 2nd Law problem - all of which are solved in the same way! 1) The first step in ...
|
| Bouyancy | 1/26/2008 |
Q: I am trying to build a floatation device and need to know how many cubic inches of air does it take ...
A: 100 pounds of water has a mass of 100lb/2.2pounds/kg=45.4kg. 1kg of water occupies a volume of 1 ...
|
| Electricity | 1/26/2008 |
Q: I do not have 220 coming into my house. However, I do have 110 from each hot feed to my house going ...
A: You must have measured incorrectly. One hot line will be +110 Volts above ground while the other hot ...
|
| Physics | 1/21/2008 |
Q: Consider these two scenarios: A) A non-operating helicopter is placed on a pedestal which is 10 ...
A: The fundamental difference here is that in the 2nd case your helicopter IS doing work! In order for ...
|
| Hydraulics Homework | 1/20/2008 |
Q: There is a pump that has a force of 10N the Area of the pump is 1cm2 (First area). The pressure is ...
A: I agree with your answer! This is a Newton's 1st Law problem - in which case opposite forces [in ...
|
| force | 1/20/2008 |
Q: sir sir i hav one doubt in force 1) when ever force is applied on a body it accelerates. If a body ...
A: The velocity of an object will remain constant if the the UNBALANCED force acting on the object is ...
|
| science | 1/19/2008 |
Q: I am in the 8th grade and have to do a science project. I have to do a project on physical science. ...
A: Why not make a "Rube Goldberg" machine? [Think about the game "Mousetrap"]. Rube Goldberg was a ...
|
| Compass Needle Polarity | 1/17/2008 |
Q: In Gr. 10 Science we have been studying magnetism recently, and the following question has been ...
A: The confusing point here is that the "North Pole" of the Earth is actually the "South Pole" of a ...
|
| Sonic boom | 1/17/2008 |
Q: I have seen videos of Jet aircrafts leaving sonic boom when they cross the sound barrier. i.e., when ...
A: Actually, the sonic boom is NOT a result of the jet crossing the sound barrier. Any object MOVING ...
|
| Physics | 1/16/2008 |
Q: 1. Why do you not hear the sound of distant fireworks until after you see them? 2. Why would it be ...
A: 1. Light travels MUCH faster [186,000 miles per second] than sound [346 meters per second]. 2. Sound ...
|
| Physics | 1/16/2008 |
Q: How is Orbit achieved?
A: Any rocket sitting on the surface of the Earth has insufficient energy to orbit the Earth. To do so ...
|
| Hamster powered night light | 1/15/2008 |
Q: I am doing a science project on making a hamster powered night light, and I am in 8th grade. We are ...
A: May I suggest that you attach a small DC motor [available at radio shack] to the rotating shaft of ...
|
| Physics Question | 1/15/2008 |
Q: there is a hot air ballon whos forces at 5,120N upward, 4,050N downward, 1,520N left, and 950N. ...
A: Add these 4 forces together and make their sum equal to the mass of the balloon times the rate of ...
|
| Naked Egg Drop Expeirement | 1/14/2008 |
Q: i am creating an egg drop, only instead of protecting the egg when its dropped i have to drop an ...
A: You want to makes your structure so that it slowly collapses as the egg collides. You want it ...
|
| Sound waves & Electronics | 1/13/2008 |
Q: if I have a specific sound wave how am I able to reproduce that sound using electronic components ...
A: There are specific ic chips designed to reproduce sound and there are many sites where amateurs ...
|
| force | 1/12/2008 |
Q: sir i hav some questions regarding force Now i have learnt that force always cause acceleration or ...
A: You are confusing the application of a single force with the application of several. In order for a ...
|
| electric force | 1/8/2008 |
Q: 1.The force of repulsion that two like charges exert on each other is 3.8 N. What will the force be ...
A: The equation relating the electrostatic force between charged particles is given by: Fe=k*q1*q2/r^2 ...
|
| optics | 1/7/2008 |
Q: sir can you explain me why does sun appear oval and bigger in size during sun set and sun rise. I ...
A: The light leaving the sun has to travel through the atmosphere to reach your eyes. When you look at ...
|
| standing waves | 1/6/2008 |
Q: Concerning standing waves on a fixed length of string with a set frequency. By adjusting the tension ...
A: Between the two adjacent resonances there are waves visible on the string, but there is no ...
|
| physics | 1/5/2008 |
Q: how is physics involved in swimming ? Do you know where i can get more information on this subject ?
A: Physics items involved in swimming! 1. Newton's 1st Law - Buoyancy - You float because the buoyant ...
|
| please help | 1/4/2008 |
Q: I would greatly appreciate any help you may provide to me regarding the following question. I have ...
A: 1. Your first solution is just fine - I get 31.9m. 2. For the second problem I get 329m, which may ...
|
| protons in the universe ... sort of | 1/3/2008 |
Q: well sorry this is a tad long-winded - but basically i'm questionning some figures which i've ...
A: Tough question, but let me try it this way. Assume: The number of protons per gram of matter = ...
|
| please help | 1/3/2008 |
Q: I would greatly appreciate any help you may provide to me regarding the following question. I have ...
A: The first part of this problems requires the use of momentum conservation. The initial momentum of ...
|
| physics project | 1/2/2008 |
Q: I can't remember the name of this, and I've found that it's very hard to explain and look up. I ...
A: You are talking about a "Rube Goldberg" machine. If you do a google search you will find MANY hits. ...
|
| water pressure | 12/31/2007 |
Q: If a pressure sensor is placed underwater at a given depth, say… ten feet, and a twenty foot wave ...
A: At any depth beyond the "wave base" the effects of wave amplitude should be unfelt. Wave base is the ...
|
| Center of gravity | 12/30/2007 |
Q: How to loacte center of gravity (CG) of buildings, heavy machines? Is there any practical way to ...
A: To find the 3 dimensional center of a machine perform 3 separate calculations: x [front to back], y ...
|
| Is neutron-neutron fusion easier to facilitate than proton-proton fusion? | 12/27/2007 |
Q: Neutron-neutron fusion is an example of nuclear fusion because neutrons are nucleons. Is it possible ...
A: Being easier isn't the only or even primary question. What is really important is whether or not the ...
|
| Basic a/c current question | 12/25/2007 |
Q: I understand a 3 poles a/c outlet ( Northamerican standard ) has one outlet for the ground ( this is ...
A: First of all, in AC electricity the voltage is NOT constant. In fact, the voltage of a 120 Volt AC ...
|
| relative motion | 12/23/2007 |
Q: when i hear or come across this term relative motion i really don't understand fully what it means. ...
A: In freefall up it traditionally taken to be positive. When the ball was released in the elevator its ...
|
| sub atomic particles | 12/23/2007 |
Q: will sub atomic particles actions change because they are being watched vs. not being watched
A: That is a tough question! Quantum theory does, in fact, imply that the mere act of observing an ...
|
| physis | 12/20/2007 |
Q: i dnt understand the altwood machine and forces...can u help?
A: The Atwood's Machine is a device consisting of a singly pulley attached to a fixed support, a string ...
|
| calorimetry | 12/19/2007 |
Q: A hot, just-minted coper coin is placed in 101 g of water to cool. The water temperature changes ...
A: When the coin is added to the water, the heat lost by the copper coin must be exactly equal to the ...
|
| Vectors | 12/11/2007 |
Q: I am trying to study for my physics exam coming up, and I have seemed to have forgotten everything i ...
A: The problem is that your time is incorrect! When you solved the displacement equation for the time ...
|
| Sound | 12/11/2007 |
Q: If energy can never be created or lost, just transformed from one state to another; can you get a ...
A: Technically what you say is true! If a collision between two objects occurs on the earth, some of ...
|
| EMP | 12/7/2007 |
Q: Is there anything that is not nuclear, or otherwise harmful that can give off an electromagnetic ...
A: "Never Say Never!" I think that such a hand held device is very unlikely! The way that EMP works is ...
|
| EMP | 12/6/2007 |
Q: Is there anything that is not nuclear, or otherwise harmful that can give off an electromagnetic ...
A: The EMP is caused by the intensity of the explosion and is not specifically related to the fact that ...
|
| Newton's Cradle | 12/5/2007 |
Q: When you place a finger in between the middle of the Newton's cradle, somehting strange happens. ...
A: Your finger changes the system completely by introducing an external force into the system. Momentum ...
|
| Physics | 12/5/2007 |
Q: Choose the one alternative that best completes the statement or answers the question. 1. A car ...
A: 1. ALL of these! More force is needed if the car is going faster. More force is needed to stop the ...
|
| Problem Sheet | 11/29/2007 |
Q: I have got few problems and looking for answers to them. Can you please help me in this regard. ...
A: 1. Moving your arms forwards will cause your torso to move in the opposite direction, hopefully ...
|
| Centripetal Force | 11/29/2007 |
Q: I've been stuck with this problem for a long time. Can you help me? A 1100 kg car negotiates a ...
A: First of all, the coefficient of kinetic friction is ONLY relevant if one surface is "sliding" past ...
|
| radioactivity | 11/28/2007 |
Q: What is "radioactive equilibrium" And also, during beta plus decay, how is energy used to turn a ...
A: Radioactive equilibrium occurs when a radionuclide is being generated as quickly as it is decaying. ...
|
| Magnetism | 11/25/2007 |
Q: Would it be possible to create a solid state (no moving parts) electricity generator with a ...
A: The ONLY way to generate an electric current from a magnetic field is to have a changing magnetic ...
|
| fluids | 11/21/2007 |
Q: The cross-sectional area of the faucet is 1.8x10^-4m^2, and the speed of the water is 0.85 m/s as ...
A: According to the "law of continuity" the product of the fluid flow rate and the cross section area ...
|
| My physics research paper on projectile motion | 11/19/2007 |
Q: how does air resistance tie into projectile motions with initial velocity, gravity
A: This is an incredibly complex question! Gravity isn't an issue, but speed, shape, surface texture, ...
|
| Why are magnetic field lines always depicted as pointing from north to south? | 11/18/2007 |
Q: Southern magnetic energy is emitted from the side of a magnet taking in the lines of force. Northern ...
A: First of all, the magnetic field is a defined quantity. A magnetic field is an area of space where a ...
|
| DIFFRACTION of Light | 11/17/2007 |
Q: For diffraction of light through a single slit, Width of secondary maximum fringes = (Distance of ...
A: 1. I don't think that the initial statement is correct. The equation predicting the location of the ...
|
| physics | 11/16/2007 |
Q: I read that if you lift a backpack you are doing work..but once on your back and when you walk no ...
A: I don't agree with the second part. Walking the backpack forward does indeed require work. Now it ...
|
| ,electricity, | 11/14/2007 |
Q: sir if a point charge is realesed in a non uniform electric field with field lines in same direction ...
A: If the electric field is uniform [meaning that the electric field lines are parallel and equally ...
|
| nuclear physics,equilibrium | 11/13/2007 |
Q: sir can you please tyell me the pracctical application of special theory of relativity? also tell if ...
A: Incredibly, the Special Theory or Relativity has led to or can explain many different phenomena! 1. ...
|
| Physics B - Centripetal Force Question #2 | 11/12/2007 |
Q: I'm having a hard time with this question. ...
A: First of all, your force diagram is essentially correct. What you need to recognize is that the ...
|
| Fluids | 11/12/2007 |
Q: Two identical containers are open at the top and are connected at the bottom via a tube of ...
A: To make this problem easier, let's assume that the density of mercury is 13 times the density of ...
|
| Physics B - Centripetal Force Question | 11/11/2007 |
Q: I'm having some trouble understanding centripetal force. I know that the force is always towards the ...
A: Let me begin by explaining centripetal acceleration in an entirely different way. Acceleration is ...
|
| Spring | 11/10/2007 |
Q: A spring, with a spring constant of 50 N/m is initially compressed by 3cm. How much work is required ...
A: Your are, of course, interested in the positive answer since you are looking for the additional work ...
|
| Spring | 11/9/2007 |
Q: A spring, with a spring constant of 50 N/m is initially compressed by 3cm. How much work is required ...
A: The energy stored in a spring is given be U=1/2*k*Dx^2 where U is the energy, k is the spring ...
|
| rotation of earth | 11/8/2007 |
Q: why do storms or high speed winds move forward spirally?
A: Sorry, I accidentally hit reject. Here is my answer! According to Newton's 1st Law, "An object in ...
|
| physics | 11/8/2007 |
Q: 1.Introduction One important elementary example of motion is that of free fall, which is the ...
A: 1. This first question can be answered by using the data given above to plot a graph of Displacement ...
|
| physics | 11/7/2007 |
Q: I can lift a bag off the floor,a weightlifter can lift more than his body weight.Why can he not lift ...
A: The difference is that in the case of the cage there is an EXTERNAL force being exerted on the ...
|
| Quantum physics/mechanics vs old school mechanistic physics | 11/6/2007 |
Q: I'm doing some research for a speculative fiction novel based around the 19th century concept of the ...
A: The problem with this sort of speculation is the you have stated an "if ... then" statement where ...
|
| Boiling water | 11/3/2007 |
Q: What affect does elevation have on waters bioling point and would the type material a pot is made of ...
A: Water [or any other liquid for that matter] boils when the vapor pressure of the liquid exceeds the ...
|
| Bike riding and wind resistance | 11/2/2007 |
Q: I have a question. If I ride 15 mph in an upright position (about a 12 o'clock position), how much ...
A: I don't really know the magnitudes for the forces involved because they depend on so many different ...
|
| physics | 11/1/2007 |
Q: A 250 gram baseball traveling with a velocity of 40m/s is hit by a bat and leaves at 60 m/s in the ...
A: To solve this problem make use of the "Impulse" equation: F*Dt=m*Dv where F is force, Dt is the time ...
|
| kinetic friction | 10/31/2007 |
Q: A car is turning on a curve whose radius of curvature is 23.1 meters. If the car is traveling a 13 ...
A: This problem is fundamentally a Newton's second Law problem where the sum of the forces acting on an ...
|
| centipetal force at the TOP of a string | 10/29/2007 |
Q: A girl swings a ball in a vertical circle at the end of a string. Is the force applied by the ...
A: The only difference in the roller coaster problem is that the force causing the coaster to move in a ...
|
| AP Physics B | 10/28/2007 |
Q: 1. A push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T ...
A: 1. First make a force diagram. In this case: Force Normal - up, Force of Gravity - down, Force of ...
|
| Optical Fibres | 10/27/2007 |
Q: My question is about the time it takes for: a) a ray of light travelling down the central axis of a ...
A: Given that the critical angle is 71.5degrees. Form a right triangle where one angle is 71.5 degrees, ...
|
| 1st law of thermodynamics | 10/27/2007 |
Q: I have been doing some mind games inspired by teaching basic physics to the kids.. and have a ...
A: Actually, the energy has NOT been lost! The total energy released through E=mc^2 at sea level would ...
|
| earth science | 10/25/2007 |
Q: what are the physics of an egg drop project such as pertaining to gravity an kinetic energy in those ...
A: When an egg [or any other object for that matter] is dropped from a height h, the egge begins with ...
|
| Newton's 3rd Law | 10/25/2007 |
Q: A squirrel with an arm full of nuts is sliding across an icy flat roof close to the edge. He ...
A: The squirrel throws the nuts off the roof. Because of the 3rd Law every action is accompanied by a ...
|
| testing electromagnets in liquids | 10/24/2007 |
Q: I am doing a science project on electromagnets and my teacher wants me to test the electromagnet in ...
A: In my opinion, most of these liquids would have very little effect on the magnetic field. Why? ...
|
| voltage | 10/20/2007 |
Q: I would like to buy a small, brush motor with no more than 1.5 volts present at the electrodes. ...
A: The "nominal voltage" is the voltage across the motor while under normal operating conditions. The ...
|
| Circuits | 10/17/2007 |
Q: I don't understand how diameter affects current. Very confused! Please help, here is theA ...
A: Think of the wire as if it were a pipe. If you double the diameter of a pipe you will quadruple the ...
|
| physics | 10/17/2007 |
Q: Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the ...
A: The key to solving rotational problems is to pretend that the problem is linear, but replace each of ...
|
| Physics | 10/16/2007 |
Q: What is elastic potential energy? Show one sample calculation of the elastic potential energy ...
A: Elastic potential energy is a measure of a system' ability to perform work [apply a force through a ...
|
| Projectile Motion | 10/15/2007 |
Q: A shell is fired from the ground with an initial speed of 1.70*10^3 m/s at an initial angle of 55 ...
A: I really just answered a similar question which I have posted below. Subject: Projectile motionA ...
|
| physics-acceleration equations | 10/15/2007 |
Q: I don't necessarily want the answer to this but can you please help me to solve it? Here is theA ...
A: All one dimensional kinematics problems are done in the same way. There are 6 available variables: ...
|
| Projectile Motion | 10/14/2007 |
Q: I have a question on projectile motion. If we are given change in X, Y, and acceleration for both (X ...
A: I am not exactly sure what you are asking, but here is a response that I gave to a similar question ...
|
| ac circuits | 10/13/2007 |
Q: how do i calculate the average current or voltage of a sinusoidal wave.what is all this thing about ...
A: The "average" current or voltage in an AC circuit is not what you would normally consider an ...
|
| kinematics | 10/13/2007 |
Q: A man wants to run 5.00km in 13.0 min. after 12 min, he has 0.500km to go, so he accelerates for a ...
A: Relatively tough question! Here is how I did it! First of all, the average velocity during the ...
|
| plz answer | 10/12/2007 |
Q: "hello sir, sir can we covert applied pressure into electricity. I mean can we generate ...
A: Yes, this is a very old technology called piezoelectricity. In this effect when certain crystals are ...
|
| Projectile motion | 10/10/2007 |
Q: A golf ball with an initial angle of 34 degrees lands exactly 240 m down the range on a level ...
A: All problems of this type are solved in the same way! There are 6 possible variables in any ...
|
| Projectile motion | 10/10/2007 |
Q: A daredevil jumps a canyon 12 m wide. To do so, he drives a car up a 15 degree incline. a. What ...
A: All problems of this type are solved in the same way! There are 6 possible variables in any ...
|
| heat | 10/9/2007 |
Q: A silver bar 0.125 meter long is subjected to a temperature change from 200 degrees Celsius to 100 ...
A: The change in length DL is given by: DL=alpha*Lo*DT where Lo is the original length of the bar, ...
|
| circular | 10/9/2007 |
Q: A 1500 kg car takes a 58 m radius unbanked curve at 15 m/s. What is the size of the friction force ...
A: Each of these is a Newton's 2nd Law problem where the sum of the forces SF acting on the object is ...
|
| Hydrauelectric | 10/7/2007 |
Q: This question may be more about definition than physics. I understand the names associated with ...
A: The hydraulic system is only a way to convert one form of energy into a different form. It is NOT an ...
|
| Acceleration | 10/6/2007 |
Q: I have a question from my homework: There are to blocks A and B. The mass of A is 20kg and the mass ...
A: This is a Newton's 2nd Law problem: the sum of the forces SF acting on a system will equal the mass ...
|
| hi.. | 10/6/2007 |
Q: sometimes people say that water is removed from clothes in a spin dryer by centrifugal force ...
A: Its an old explanation that works but as you probably already guessed is just not true! According to ...
|
| Tangential Speed | 10/5/2007 |
Q: A 0.900−kg ball is on the end of a rope that is 1.36 m in length. The ball and rope are ...
A: Picture the following force diagram. The string is the hypotenuse of a right triangle. The vertical ...
|
| physical science question? curious | 10/2/2007 |
Q: A cannon weighing 2000 lbs. fires a cannonball weighing 25 lbs. The cannonball is pushed out with a ...
A: This problem just doesn't make sense to me [unless I have overlooked something obvious!]. A 2000lb ...
|
| quantum theory | 9/30/2007 |
Q: 1. is the photon the same thing as a quantum? 2. did the quantum theory, used to explain the ...
A: 1. Quantum theory merely says that the universe is "granular" rather than continuous. This means ...
|
| Physics Projectile Motion help? | 9/26/2007 |
Q: I have a question that involves Newton's second law of motion. When an object is free falling on ...
A: You are assuming that the acceleration of gravity g is constant [It really isn't; g becomes stronger ...
|
| electrical resistance | 9/24/2007 |
Q: 1 what effect does connecting an ammeter and voltmeter to a circiut have on the experimantal ...
A: Assuming that both meters are analog and that they are being used correctly, every analog meter gets ...
|
| i don't get projectile motions | 9/23/2007 |
Q: i don't really get the ideas of projectile motions, becasue i get confised with teh vertical and ...
A: The key to projectile motion is to keep the vertical and horizontal completely separate; one does ...
|
| Falling Objects | 9/23/2007 |
Q: A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball ...
A: All freefall problems have 6 possible variables: Do, DF, Vo, Vf,a & t. These 6 variables are related ...
|
| Physics Question | 9/22/2007 |
Q: I have a question regarding part b. I have figured out part a by plugging into the formula for ...
A: To find the gravitational force of the Earth on the rock sitting on the surface of the moon you ...
|
| A question. | 9/21/2007 |
Q: If your pushing on a table, and since the table pushes back. Also acknowledge that they're both ...
A: If the table is NOT accelerating [if its velocity is constant] then, yes, the opposite forces will ...
|
| big bang | 9/20/2007 |
Q: im pretty sure this question is to do with physics. Could you please give me a brief description of ...
A: About 13.7 billion years ago something happened. We don't know exactly what that was, but we do know ...
|
| Physics 309K | 9/19/2007 |
Q: My question describes three boxes tied together with a string lying the same distance apart on the ...
A: This is not the "formal" answer, but given the conditions in the problem, the force applied will be ...
|
| motion- physics | 9/18/2007 |
Q: In a nuclear disintegration, an a (alpha ?) particle is observed leaving the site. If a neutron (not ...
A: Assuming that ONLY the alpha particle and the neutron are emitted in this disintegration the best ...
|
| shock absorbing materials | 9/16/2007 |
Q: I am conducting an experiment to find out what type of materials abosrb shock best. I am ...
A: In general, your best bet will be to use something that PERMANENTLY deforms on impact without ...
|
| Help me please. | 9/16/2007 |
Q: A car starts from rest at a stop sign. It accelerates at 2.0 for 6.0 seconds, coasts for 2.0, and ...
A: May I suggest a totally different approach? Make a graph plotting the velocity of the car as a ...
|
| Physics Help! | 9/14/2007 |
Q: A ball is thrown horizontally off the edge of a cliff with an initial speed of 11.0 m/s. (a) How ...
A: All freefall problems can be solved in the same way! First identify as many of the 6 possible ...
|
| Can a falling cylinder pass through a gate into a compressed air chamber? | 9/12/2007 |
Q: Could a free falling cylindrical-tank pass down through a tube/gate mechanism into a compressed air ...
A: Since the pressure is constant [because the reservoir is much larger than the change in volume] the ...
|
| vector addition help! | 9/10/2007 |
Q: I have tried working on this problem many times now and I still cannot get the right answer. After ...
A: First, break the two vectors into x and y components. I assumed that vector B was parallel to the x ...
|
| physics | 9/10/2007 |
Q: A charge of q=+66nC is located at a distance of 3.4cm from a charge of -47.0 nC. What are the x and ...
A: First determine the magnitude of the electric field at point P by each charge: ...
|
| Physics | 9/4/2007 |
Q: I am having trouble understanding what to do with the information given in the following equations: ...
A: Every one of these problems is done in exactly the same way! Really! All freefall questions involve ...
|
| electrcity | 8/15/2007 |
Q: i read that the two wires from ac generator having some potential difference say 33KV in power ...
A: Typically, the electricity brought into your house is as you have described. But since most ...
|
| negative velocity and zero acceleration | 8/15/2007 |
Q: How can an object have negative velocity and zero acceleration? Or how about zero velocity and ...
A: Negative velocity just means that the object is moving "backwards" [or downwards] relative to the ...
|
| energy from a descending wheel | 8/12/2007 |
Q: I want to know the amount of electricity that can by generated from descending objects on a wheel, ...
A: First of all, recognize that what is theoretically possible and what is practical are two entirely ...
|
| Velocity | 8/9/2007 |
Q: If a ball is thrown upward and a ball is thrown downward with the same velocities, how do their ...
A: Assuming that you are ignoring the effects of air friction, both balls will strike the ground with ...
|
| physics | 8/8/2007 |
Q: A hospital petient receives a quick 500-cc blood transfusion through a needle with a length f 5.0 cm ...
A: I don't think that this question can be answered as it is asked. Here are the problems as I see ...
|
| physics | 8/8/2007 |
Q: In an industrial cooling process, water is circulated through a system. If the water is pumped with ...
A: There are two principle concepts involved here: the Law of Continuity and the Bernoulli Equation. ...
|
| electricity | 8/6/2007 |
Q: sorry i keep on asking questions , but as i am reading the chapter electricity i am getting more ...
A: Your analysis is fundamentally correct. If the wire is thinner the voltage delivered by that wire ...
|
| electricity | 8/5/2007 |
Q: sir i want to know that in a bulb, does all the kinetic energy of the electrons or charge gets ...
A: What you are ignoring is that the fan is running on AC rather than DC current! This matters because ...
|
| electrostatics related questions | 8/5/2007 |
Q: 1. How much positive and negative charge is there in a cup of water? 2. If a body gives out 109 ...
A: I was initially disinclined to answer this question since it seems very much like a homework ...
|
| plasma ball | 8/3/2007 |
Q: Could you please tell me why, when you put your hand on a plasma ball dome your hands light up a ...
A: A plasma ball actually a really big capacitor! In the center of the plasma ball is a small glass ...
|
| electricity | 8/2/2007 |
Q: i want to know that the current coming to house is alternating current. now there are three wires ...
A: The electrons that contribute to the excess electron density at one point in the wire come from a ...
|
| electricity | 8/2/2007 |
Q: i want to know that the current coming to house is alternating current. now there are three wires ...
A: I think that you need to look at electricity a little bit differently! All conductors contain ...
|
| resistance | 7/23/2007 |
Q: 1)why does the internal resistance of a battery decrease with increase in the temperature? because ...
A: 1) The internal resistance of a battery is determined primarily by the rate of the chemical ...
|
| electricity | 7/22/2007 |
Q: why is the terminal voltage(when the current is drawn )of a cell less than the emf (when circuit is ...
A: Voltage is, for all practical purposes, a measure of energy. For example, if a battery has an EMF of ...
|
| physics | 7/21/2007 |
Q: does height affect the measurement of gravity? explain
A: When you are near the surface of the earth a relatively small change in height will have an ...
|
| Motion along inclined plane | 7/21/2007 |
Q: I have a wheel rolling down a 20 degree decline. The weight of the wheel is 627 lbs-f. The coeff. ...
A: In order to determine the force you MUST know the distance that the plate [or the object] deflects ...
|
| Motion along inclined plane | 7/20/2007 |
Q: I have a wheel rolling down a 20 degree decline. The weight of the wheel is 627 lbs-f. The coeff. ...
A: Infinity! If the stop plate does NOT deflect, the rate of change of velocity will be infinite! Since ...
|
| physics | 7/19/2007 |
Q: compare and contrast the general shapes of the following graphs for motion with constant velocity ...
A: If the velocity is constant the displacement will be given by D=v*t while the velocity will be ...
|
| physics | 7/18/2007 |
Q: A packing crate is placed on a 20 degree inclined plane. If the coefficient of static friction ...
A: For a crate sitting on an inclined plane there are are only three relevant forces: the force of ...
|
| physics help | 7/17/2007 |
Q: when a projectile was fired from a gun, it had initial horizontal and vertical components of ...
A: "its maximum height?" is irrelevant! The gravitational acceleration of a projectile is -9.8m/s^2 in ...
|
| resistance | 7/15/2007 |
Q: I have some questions based on electricity 1) why does a thin wire offer more resistance to current ...
A: 1. Keep in mind that matter is MOSTLY empty space! Given a larger cross sectional area, there is ...
|
| physics-mechanics 2 questions | 7/15/2007 |
Q: random questions out of the text i cannot seem to wrap my mind around. First year University Physics ...
A: 1. Assume that the distance from the top of the window to the point from which the balloon was ...
|
| Magnetism | 7/12/2007 |
Q: In a right angled triangle Hypotenuse=50m Base=30m Opposite=40m Current flowing ...
A: The answer is zero! Given the distances and current in the problem, there sill be no significant ...
|
| sound | 7/11/2007 |
Q: sir i know that this may not really be related to your field, its related to resonance of sound, but ...
A: 1. Resonance occurs when the frequency of the driving force [the source] exactly [or almost exactly] ...
|
| Lightning | 7/10/2007 |
Q: Lightning is caused by the atmosphere being overly negatively charged and the earth being too ...
A: Sure you could do as you say! But could it be done at a reasonable cost and with realistically ...
|
| Sonic booms, Cherenkov radiation, other 'booms' | 7/6/2007 |
Q: Many moons ago I wondered if breaching the speed of light would result in a flash of light in the ...
A: The Cherenkov radiation is not caused by microwaves, X-rays, etc., but is the result of some ...
|
| Physics | 7/5/2007 |
Q: Please explain me the working of a television, an ink pen, a calulator and a ceiling fan.
A: You really ask a lot of me! Have you any idea about the complexity involved? TV - The answer to this ...
|
| Electro static field | 7/3/2007 |
Q: There is no net electric field inside a hollow charged sphere ( Static Charge) If the sphere is full ...
A: Assume for a moment that you have a charged conducting spherical shell. The field just outside this ...
|
| physics for living | 7/3/2007 |
Q: I'm wondering if you can name some great books on physics for non-physicists. There are two types ...
A: I have many physics book reviews on my web site at www.jimthx.vze.com. Many of these will likely ...
|
| Motion and Force | 7/1/2007 |
Q: I quick reply would be amazing! I have some idea how to solve this but i don't think its right and ...
A: 1. The final displacement of an accelerating object is given by: Df=1/2*a*t^2+Vo*t+Do For the ...
|
| floatation | 6/27/2007 |
Q: I need a formula to calculate how many floatation devices are required to float a boat dock
A: Without more details it is difficult to be specific, but the general idea is for the mass of the ...
|
| car audio | 6/26/2007 |
Q: Can you tell me what happens to power distribution with 2 subwoofers powered by an amp? Do they add ...
A: The answer to the question depends on the output parameters of your amplifier! If the output of the ...
|
| car audio | 6/26/2007 |
Q: Can you tell me what happens to power distribution with 2 subwoofers powered by an amp? Do they add ...
A: The total power delivered to the two subwoofers would have to be added up to get the power ...
|
| Momentum and Kinetic Energy | 6/25/2007 |
Q: Truck 'A' of mass 6000Kg travelling east at 60mph collides head-on with truck 'B' of mass 3000Kg ...
A: Momentum is equal to the product of mass and velocity: p=m*v Therefore the momentum of the first ...
|
| Electricity | 6/24/2007 |
Q: I would like to know how an electric bulb lights up as soon as the switch is pressed although the ...
A: There are two different velocities associated with current flow: drift velocity and propagation ...
|
| physics help please | 6/24/2007 |
Q: I have a problem and they have set up a table for us. It shows the mass of an object, the initial ...
A: The heat [energy] gained or lost by an object will be given by: DQ=m*c*DT where DQ is the heat ...
|
| Physics (vectors) | 6/23/2007 |
Q: Vector a has a magnitude of 5.00 m and is directed east. Vector b has a magnitude of 5.00 m and is ...
A: 1. To add these two vectors you first have to break them into their x and y components. Vector a: 5i ...
|
| Spinning ball fountain | 6/21/2007 |
Q: Do you know what the physics are behind those massive granite ball fountains. They are able to make ...
A: Keep in mind that for all practical purposes water is nearly incompressible! On the other hand water ...
|
| Helium gas and a Super Ball. | 6/20/2007 |
Q: Greetings Mr. Kovalcin, Wikipedia defines a Super Ball thusly: "It is an extremely elastic ball made ...
A: You misunderstand the nature of a floating balloon. It is not that the balloon contains Helium, but ...
|
| physics | 6/18/2007 |
Q: why do battery indicators show that a battery is fully charged and then suddenly half charged and ...
A: What kind of battery indicator are you refering to? The answer depends on the nature of the battery. ...
|
| motion | 6/17/2007 |
Q: what is relative velocity?
A: Relative velocity is the velocity of an object compared to some other object [rather than to some ...
|
| question on mountains | 6/14/2007 |
Q: bonjour, i have a question on mountains, and their role on this earth. i think it's well known that ...
A: Sure mountains and continents are moving, but we're talking millimeters per century here. Not ...
|
| Mechanics | 6/14/2007 |
Q: At time t= 0 a particle is projected horizontally from a point A with position vector (5i + 30j)m. ...
A: First calculate the time by using the vertical components of the position vectors using ...
|
| physics | 6/10/2007 |
Q: I am requesting u to help me in understnding the difference in precision & accuracy. please, make it ...
A: Precision is about reproducibility. For example if you were target shooting with a rifle and every ...
|
| Physics | 6/7/2007 |
Q: 1. What is the instantaneous speed at the end of 5 seconds of a flower pot which has been knocked ...
A: 1. Final velocity is predicted from: Vf=a*t+Vo [a=-10m/s^2, t=5.0s and Vo=0m/s] 2. Final ...
|
| Can standing waves be polarised? | 6/5/2007 |
Q: Subject is question!! can standing waves be polarised? ANSWER: Whether a wave is standing or not is ...
A: Sound can, of course, move through solids, in which case they could be transverse. As far as I know, ...
|
| Physics | 6/5/2007 |
Q: 1. Under which of the following conditions does the elephant experience constant velocity? (Choose ...
A: 1. A and C would be constant velocity. 2. B and D are accelerating - velocity is changing. 3. ...
|
| Physics | 6/4/2007 |
Q: 1. Which of the following statements could be considered a scientific hypothesis? (A) The best kind ...
A: 1. I would guess D because it is testable. B might be possible at some time in the future but is ...
|
| physics- impact force on an object | 5/28/2007 |
Q: I am trying to determine the impact force on a diver when they hit the water, depending on the ...
A: Assuming that you can calculate the velocity with which the diver hits the water, here is an easy ...
|
| Surface Behavior | 5/25/2007 |
Q: You may find this question a bit odd but I will pose it just the same: What word best describes when ...
A: My guess here is that the effect you are looking for is "surface tension", the attraction of ...
|
| Electrostatics | 5/22/2007 |
Q: Two identical balls each having charge of 2*10^-7C and a mass 100g are suspended from a common point ...
A: The force between the two balls will be given by Fe=k*Q1*Q2/R^2. This force will be horizontal. The ...
|
| uniform motion | 5/20/2007 |
Q: I am having a problem with the phrase “uniform motion,” and have come up with a simple example of ...
A: Q1. I agree. Q2. Again, I agree with your analysis. As long as you "feel" that there is no ...
|
| Motion and Energy | 5/19/2007 |
Q: Our college professor gave us the following question (paraphrased): Suppose a car (2000kg) moving ...
A: I got the same answers, but there is one part of the problem I don't quite follow, "The distance ...
|
| a.c d.c current | 5/14/2007 |
Q: what's the significance in the polarity of a.c current and why it is used in home?
A: AC doesn't really have a polarity. What is true, however, is that in your home only one of the two ...
|
| atomic energy | 5/14/2007 |
Q: how much energy is liberated from a single atom of an atomic bomb?
A: Not very much! If you split an atom of Uranium 235 into two smaller pieces the energy released will ...
|
| base and derived uinits | 5/12/2007 |
Q: I think ampere(unit of current) is a derived unit but why it is considered as base unit? please tell ...
A: This has to do with the original definition of the Ampere! The original definition said that if you ...
|
| Sonic boom | 5/9/2007 |
Q: What are the possible effects on wildlife subjected to regular low level supersonic air traffic. And ...
A: Just an opinion, but unless the sonic boom is much stronger than that which is common it is unlikely ...
|
| electricity,measyrement | 5/8/2007 |
Q: what is difference between chemical and physical balance? is electric current due to flow of ...
A: Not sure what you mean by the first statement. Current flow is due to the motion of electrons ...
|
| question on magnetism | 5/8/2007 |
Q: I need some knowledge on any materials that are capable of stoping magnetism. Are there any ...
A: One way to block a magnetic field is through the use of superconductors which will repel magnetic ...
|
| "squared" | 5/4/2007 |
Q: Why and how did "squaring" something become so important? I ask this because I was dissecting E=mc2 ...
A: The "square" that occurs in so many science formulas is the result, in many cases, of geometry! For ...
|
| atoms | 5/4/2007 |
Q: Something are hard to believe in the physical world (1)Is everything made up of atoms in our natural ...
A: 1. Everything is NOT made of atoms. However, all of the normal matter we see around us is made of ...
|
| about the light | 5/1/2007 |
Q: How do we relate light to force?? In the following question, a beam of red laser light ( = 633 nm) ...
A: 1. Newton's 2nd Law can be written in terms of momentum when it is written in its "impulse" form. ...
|
| elastic and inelastic collisions | 4/30/2007 |
Q: I am having trouble in deriving a formula to obtain final velocities in elastic and inelastic head ...
A: Actually, the problem as you have described it is quite simple. If the two cars have the same masses ...
|
| Time Travel concept | 4/26/2007 |
Q: I am curious about Time Travel. I have read and seen material on the topic. Most tend to sway to the ...
A: Unfortunately, such conjecture is pure speculation. Kip Thorne did write an article for Physical ...
|
| conductivity, heat | 4/25/2007 |
Q: why copper tip is used on iron in soldring iron? if expansion of glass becomes more then mercury ...
A: Why use copper in a soldering iron tip? a. Copper is an excellent electric conductor. b. Copper is ...
|
| sun | 4/25/2007 |
Q: why earth will fall towards sun if it(earth) stops rotating around sun? what is sun made of?
A: The Earth is moving around the Sun at a very high velocity. The action of the gravitational force on ...
|
| physics | 4/22/2007 |
Q: There is an amusement park ride where the riders spin in circle and "stick" to the wall when the ...
A: In an amusement ride often called the “Rotor”, the passengers stand in a circular room. The ...
|
| physics | 4/22/2007 |
Q: If an amusement park ride goes in a constant circle (then the floor drops) does it have a constant ...
A: If you are refering to the ride where the occupants stand along a vertical wall, the room spins and ...
|
| Physic- Law of Moment | 4/20/2007 |
Q: If a hydraulic press exerts an effort of 490N through a distance of 1m, it raises a truck 0.25m. ...
A: The work output of a machine must be equal to [or less than if friction is significant] the work put ...
|
| physics | 4/18/2007 |
Q: I once rode an amusement park ride where riders stand against the inside of a cylinder, once the ...
A: The room begins to spin in a circle and then the floor of the ride “falls out”. If the ride had no ...
|
| thermal conduction | 4/18/2007 |
Q: Suppose two points at different temperature are connected to each other by a complex system of ...
A: The idea seems good to me, but there is one problem I would be concerned with. Unlike the energy in ...
|
| acceleration | 4/16/2007 |
Q: I have greatly enjoyed reading your answers. My question is: do the laws of inertia dictate that a ...
A: I would expect, all things being equal, that the two cars you describe will accelerate at the same ...
|
| Mechanics/Pendulums | 4/15/2007 |
Q: I need some help with the followingA pendulum consists of a small object of mass m fastened t oteh ...
A: First of all, you didn't supply the mass of the pendulum. In any case, I would never do the problem ...
|
| physics help | 4/14/2007 |
Q: I am a undergraduate at Rutgers UNiversity and heaving tremendous problem with this physics ...
A: a. True - If the total masses of the gases are the same, there will be more N2 molecules present ...
|
| Light | 4/13/2007 |
Q: I'm trying to make graphs for the following two situations: (1) Light of a single wavelength is ...
A: When light passes through a double slit, constructive interference occurs on the screen where the ...
|
| Linear accelerator | 4/13/2007 |
Q: I am presently undergoing external beam radiation for prostate cancer. I am almost through with my ...
A: The photons NOT absorbed by the prostate are being absorbed by the surrounding healthy tissue! ...
|
| Momentum | 4/12/2007 |
Q: I need your help please with the followingA .15 kg frame, when suspended from a coil spring, ...
A: [D means "change in"!] 1. To find the velocity of the putty use energy conservation. The GPE of the ...
|
| Doppler Effect | 4/11/2007 |
Q: Could you briefly explain the doppler effect to me? My book does a terrible job of this. Thanks! ...
A: According to the Doppler Effect the pitch that an observer hears from a sound source is dependent on ...
|
| Electricity/Circuits | 4/10/2007 |
Q: I have some questions about the following circuit: RESISTOR + - __12 ...
A: I agree with everything you have said about the unknown resistance and currents. But as to your ...
|
| physical | 4/10/2007 |
Q: What physical science occurs during walking up a hill?
A: Walking up a hill requires work [work = force x distance] and results in an increase in ...
|
| Physics:Capacitors | 4/8/2007 |
Q: i can't seem to get these questions. i need help on these. thanks 1) potential difference between ...
A: 1) The potential difference between two parallel plates will be dirrectly proportional to the ...
|
| friction | 4/8/2007 |
Q: We say friction acts in opposite direction that of motion of object. Suppose we consider a car ...
A: The statement that "friction always acts opposite the direction of motion" just isn't correct. What ...
|
| Field inside inside charged conductor | 4/5/2007 |
Q: Is the electric field inside a charged hollow conductor OF ANY RANDOM SHAPE (not just a spherical ...
A: First of all, keep in mind that you can't "prove" anything through Gauss's Law. Gauss's Law is ...
|
| Electricity | 4/5/2007 |
Q: I am trying to solve the following problem: Two identical electric charges +Q are located at two ...
A: The electrostatic potential near a point charge is given by V=k*q/r. Since electrostatic potential ...
|
| Anti-static | 4/4/2007 |
Q: At my company, we have implemented an anti-static grounding system using grounded wrist straps and ...
A: Absolutely! The fact that you are on insulating mats etc. is a big problem from a static charge ...
|
| Torque | 4/4/2007 |
Q: I am trying to answer the followingA box of uniform density weighting 100 newtons moves in a ...
A: There does seem to be a problem with internal consistency in this problem! First of all, because the ...
|
| Equal and Opposite Reaction | 4/3/2007 |
Q: This is a question about water jet powered water craft like jetskis'. Does the water jet exit from ...
A: The water exits the jet ski below the water's surface [or at least very close to the water's ...
|
| fundamentals of physics: motion in a straight line | 3/29/2007 |
Q: A ball is thrown vertically upward from a window at 10 m/sec. It hits the ground 5.0 sec later. What ...
A: This is a typical one dimensional kinematics problem all of which can be solved in the same way. 1. ...
|
| mirrors and image characteristics | 3/28/2007 |
Q: A plane mirror essentially has a radius of curvature of infinity. Using the mirror equation, show ...
A: If the mirror is plane the focal length will be infinity. The equation then becomes ...
|
| dhwikhfwhl | 3/27/2007 |
Q: Can you tell me step by step how to make a rubber band powered car?
A: I'm not exactly sure what you have in mind. You will have to work out a way to use the rubber bands ...
|
| heat transfer | 3/27/2007 |
Q: If you have an insulated container with water in it and heat is added what will happen. Will the ...
A: If you add heat to water in an insulated container the it may: 1. Increase in temperature. 2. ...
|
| entropy changes | 3/26/2007 |
Q: Could you please EXPLAIN the solution of this numerical: 3 moles of CO2 expands isothermally (in ...
A: Here is the previous answer. ANSWER: Change in entropy is equal to the change in the internal energy ...
|
| entropy changes | 3/25/2007 |
Q: Could you please EXPLAIN the solution of this numerical: 3 moles of CO2 expands isothermally (in ...
A: Not at all. The entropy of the universe increases in this process. At the end of the process the ...
|
| entropy changes | 3/22/2007 |
Q: Could you please EXPLAIN the solution of this numerical: 3 moles of CO2 expands isothermally (in ...
A: Change in entropy is equal to the change in the internal energy of a system at a constant ...
|
| physics problem(hoping for exact answers) | 3/21/2007 |
Q: 1. while giving birth, a mother's uterus contracts and exerts a sudden force of 40 N on the baby ...
A: There seem to be some missing details, but here goes. 1. The net work done on the fetus will be ...
|
| For every force there is an equal and opposite force? | 3/21/2007 |
Q: Does this mean that net force acting upon the sum of every particle/mass in the universe (negating ...
A: Sorry, but force is not conserved! The net force on every particle in he universe is certainly NOT ...
|
| Work done when water evaporates | 3/20/2007 |
Q: When water exposed to atmosphere is boiled ,why is the work done BY THE WATER (i stress on "by the ...
A: Because of Newton's 3rd Law, "for every action there is an equal but opposite reaction", the force ...
|
| Electrical misunderstanding | 3/18/2007 |
Q: first of all i would like to say it is really nice of you to take peoples questions that you dont ...
A: First of all, "too much amperage" is not very much. In fact about 100 milliamps or 0.10 amperes is ...
|
| Electrical misunderstanding | 3/17/2007 |
Q: first of all i would like to say it is really nice of you to take peoples questions that you dont ...
A: Let me preface this with a WARNING! Any voltage over about 50 Volts has the potential [when ...
|
| Atom at 0K | 3/16/2007 |
Q: What will happen to atom at 0K degree? Will its size decreased?
A: Cooling an individual atom to 0 deg Kelvin will have no effect on the volume occupied by that atom. ...
|
| ultrasound | 3/14/2007 |
Q: I would like to know if in ultrasound a plausible explanation would be that it excites the tissue ...
A: Only speaking from the physics teacher's point of view, it is entirely reasonable that untrasound ...
|
| calorimetry numerical | 3/13/2007 |
Q: Are you not assuming here that the ice,and the water that is formed when it melts, is taking in heat ...
A: Ultimately, whatever happens the final temperature of the water and the steam MUST be the same [they ...
|
| physics | 3/12/2007 |
Q: this is regarding Newton's third law. 1)When we are standing or sitting on ground, our weight is ...
A: 1) According to Newton's 3rd Law if the Earth exerts a gravitational force on you, you will exert an ...
|
| calorimetry numerical | 3/12/2007 |
Q: I can't understand how to do the following numerical.Would be most obliged if you could help. 1 kg ...
A: The heat of fusion of ice is 334 kJ/kg, therefore, it takes 334 kJ of energy to melt 1.0kg of ice. ...
|
| Forces | 3/8/2007 |
Q: A block is at rest on an incline plane whose elevation can be varied. The coefficient of static ...
A: The block will just begin to slide when the component of the gravitational force acting down the ...
|
| Translational With Rotational Displacement | 3/5/2007 |
Q: A Uniform thin walled cylinder and a uniform solid cylinder are rolling horizontally without ...
A: Your ideas are all fundamentally correct, but the final answer is not! If finish the work for the ...
|
| battery operated | 3/4/2007 |
Q: i have a question. i have a mechanical motorized wooden train that is being powered by batteries and ...
A: The battery is a source of energy [Energy is the ability to do work - which means to apply a force ...
|
| Physics in the car | 3/2/2007 |
Q: I am interested in finding out how Newton's three laws apply to the car? Thank you so much, Ash
A: 1. According to Newton's 1st Law - an object will maintain a constant velocity unless there is an ...
|
| Temperature and kinetic energy | 3/2/2007 |
Q: If temperature is the average kinetic energy of the molecules of an object, then why does ...
A: When the velocities of the atoms/molecules in an object are all in the same direction we say the ...
|
| Magnetism | 3/1/2007 |
Q: Is there any difference between magnetic flux and magnetic field lines? I keep reading them as ...
A: Let me try to explain the difference through an example. Imagine a light bulb being used to read a ...
|
| Forces | 3/1/2007 |
Q: A block with mass of 12.8 kg slides down an inclined plane of slope angle 19.9 deg with a constant ...
A: If the block is sliding down the incline at a constant speed the frictional force acting on the ...
|
| water column | 2/28/2007 |
Q: I'm installing a piece of pipe 8" in diameter 450' height. A piece of 8" pipe weights 28.55 ...
A: The weight of the water will only be supported by the bottom of the pipe; the building will have ...
|
| circular motion | 2/27/2007 |
Q: I WANT TO KNOW THAT IN THE GLOBE OF DEATH WHY A MOTORCYCLIST DOES NOT DROP DOWN WHEN HE IS AT THE ...
A: Let me try to answer this question using a different, but analogous, example. Consider a bucket of ...
|
| circular motion | 2/27/2007 |
Q: A WEIGHTLESS THREAD CAN BEAR TENSION UPTO 3.7 KG WT A STONE OF MASS 500 G IS TIED TO IT AND REVOLVES ...
A: I think you are on the right track. Make the tension 37N as you have calculated and solve for v. ...
|
| Question regarding Magnetic Flux | 2/26/2007 |
Q: Hey there Mr. Kovalcin, I'm absolutely stumped on this physics problem. It's on the Magnetic Flux... ...
A: The magnetic flux through a closed path is equal to the magnetic field strength multiplied by the ...
|
| circular motion | 2/25/2007 |
Q: Suppose a 1-meter pendulum is released from a horizontal position as shown below.What would be the ...
A: For practical purposes a swinging pendulum in the short term is a "closed System": meaning that the ...
|
| Falling Objects | 2/22/2007 |
Q: If an object such as a steel ball has a terminal velocity that is higher than that of a rubber ball, ...
A: First of all, all objects near the Earth's surface will ACCELERATE downward at 9.8 m/s^2 IF friction ...
|
| water | 2/16/2007 |
Q: OK, One last question. What (Chemical(s), substances or elements) can be applied to an object to ...
A: The temperature of an object is directly related to the kinetic energy of the atoms within. To cool ...
|
| water | 2/15/2007 |
Q: I see how pressure can affect the freezing. However, if you pressurize water, will it freeze? If ...
A: Yes, if you apply large pressure to water confined to a small space you CAN cause the water to ...
|
| water | 2/15/2007 |
Q: I have a question about freezing water. What is the quickest way to freeze water, I mean this by: ...
A: Actually, the addition of ANY impurity will interfere with the freezing process. This is called a ...
|
| thermocouple thermometer | 2/14/2007 |
Q: the thermocouple consists of two metal wires which are joined together,which forms two junctions. ...
A: Different elements have different electronegativities [electronegativity - a measure of how much a ...
|
| machanics | 2/12/2007 |
Q: A train of constant mass M has momentumat time T, is discribed by P(T) = AT^2+BT, where A and B are ...
A: First of all, as far as I can tell the units for your two constants are not possible [a=200kg*m^-3 ...
|
| Falling Ladder Question | 2/11/2007 |
Q: We have a weekly safety discussion at the construction company that I work for. We were discussing ...
A: Surprise! The speed will be almost EXACTLY the same! Because of energy conservation the ...
|
| physics | 2/11/2007 |
Q: why does sound travel faster in granite than copper? Copper is denser than granite therfore ...
A: The distance between the molecules isn't the only thing that matters. But the elasticity of the ...
|
| physics | 2/6/2007 |
Q: can u explain me why only certain substances behave like a magnet and others not? i tried to find ...
A: All magnetism is caused by moving charges. If an atom has an even number of electrons, half of the ...
|
| physics | 2/6/2007 |
Q: can u explain me the concept of potential and potential difference in a simplified manner since i m ...
A: First can you imagine a 1 kg mass sitting on a table 100 cm high? Now drop that mass onto your foot. ...
|
| egg drop | 2/5/2007 |
Q: 1. waht are the forces acting on the egg as it falls? 2. how can you control the forces that cause ...
A: 1. The only significant force acting on the egg as it drops is the force of gravity. Theoretically ...
|
| vectors | 1/31/2007 |
Q: can two vectors having diferrent magnitude be combined to give zero resultant?how about three ...
A: I don't believe that it is possible to combine two DIFFERENT magnitude vectors together such that ...
|
| Thermal expansion | 1/30/2007 |
Q: Consider the thermal expansion of a metal rod. In the formula L(2)=L(1)[1+a{T(2)-T(1)}]Where 'a' ...
A: It is the length of the rod at the starting temperature, NOT the length at 0oC or at any other ...
|
| Is the M the rest mass of the particle ? | 1/28/2007 |
Q: Kovalcin I will have 3 questions from the same article of John G. Cramer : ...
A: I am sorry, but I don't feel my level of expertise is sufficient to meet your needs for publication. ...
|
| hydrolic power plant | 1/28/2007 |
Q: Understanding that the maintenance costs are high, what is to prevent hydrolic power plants from ...
A: Just because something is possible does not mean that it is desirable. When using a moving water ...
|
| Physics Sound | 1/26/2007 |
Q: I really need help on this. I can't figure it out!! PLEASE HELP ME!! 1. Which one of the ...
A: 1. Humans can hear between 20Hz-20,000Hz. 2. Opposite forces will be equal. 3. Beats me! 4. ...
|
| Projectile | 1/25/2007 |
Q: At 1/2 of its maximum height a projectile has 3/4 its original speed. Find the launch angle. I ...
A: Sorry this took so long, but it took quite a bit of thought. Here is what I have come up with. ...
|
| hello! | 1/24/2007 |
Q: Physics Problem: Joe wishes to hang a sign with a mass of 85.5 kg so that cable A attached to the ...
A: Based on the diagram you supplied the vertical component of the tension in cable A must be equal to ...
|
| Electric field between wires | 1/21/2007 |
Q: An electric field around the terminals of a battery is caused by an excess of electrons at the -ve ...
A: You are assuming that the flow of charge from the terminals of the batteries to the wires is ...
|
| Wave Motion | 1/19/2007 |
Q: A sinusoidal traveling transverse string wave has a frequency of 10.0 Hz and travels at 25.0 m/s ...
A: The equation describing the displacement of a string as a traveling wave passes along the string in ...
|
| Golf_balls | 1/15/2007 |
Q: Why are golf balls dimpled? Does it improve its aerodynamics?
A: Yes, the dimpling helps to keep the flow over the surface of the ball laminar rather than turbulent. ...
|
| physics | 1/13/2007 |
Q: Our topic is all about free falling bodies, and our teacher didn't explain it well. Actually, im ...
A: Believe it or not ALL of these problems can be solved using the EXACT same approach. First of all, ...
|
| physics | 1/9/2007 |
Q: could you show the solution to this old texbook problem? a.) In your own words give the ...
A: First of all let me say that I do not think that the equation is correct. I think that whoever wrote ...
|
| physics | 1/8/2007 |
Q: What is the basic rocket motion? (phy of bs)
A: The only way for a rocket to propel itself through space is through the application of Newton's 3rd ...
|
| electric motors | 1/8/2007 |
Q: I’m having trouble understanding the principles of operation of a single phase AC motor. I ...
A: There are several ways to look at this. One different interpretation would work like this. As the ...
|
| Physics | 1/7/2007 |
Q: what is the maximum deceleration a human body can take? in terms of g's?
A: The answere to this question depends on the distribution and intensity of the force causing the ...
|
| force/tension problem | 1/7/2007 |
Q: The problem is that there are 2 blocks connected by a string (that has the same mass everywhere in ...
A: The tension will NOT be the same everywhere because the mass of the string does matter. The tension ...
|
| Science Fair Project Research hep Needed | 1/5/2007 |
Q: I am looking for information in regards to my science project. My topic is: "What are the effects of ...
A: Possible effects of temperature on soccer ball. 1. Raising temperature will increase the pressure ...
|
| speed of light travel | 1/5/2007 |
Q: My students were analyzing cartoons in regards to laws of motion. One student asked, "When Road ...
A: From a non relativistic point of view Newton's Laws do still apply and if the Roadrunner accelerates ...
|
| induction on earthed plate | 1/2/2007 |
Q: I understand that IFthe plate was NOT grounded than both sides of the plate would get equal and ...
A: The answer is that the "other side" of the grounded plate becomes the ground! Therefore the charge ...
|
| induction on earthed plate | 1/1/2007 |
Q: Consider two metal plates one of them being earthed.The one NOT earthed is given a charge +Q and ...
A: If the top conducting plate is given a positive charge, the lower, grounded plate will gain a ...
|
| Egg Drop | 12/31/2006 |
Q: I have to do an egg drop experiment in which the only material I can use is cardboard. We use one ...
A: Build the cardboard into a structure that will collapse as it collides with the ground, but none the ...
|
| Egg Drop | 12/30/2006 |
Q: For a Physics project we have to construct an apparatus that will catch an egg dropped from 9.91m ...
A: You will need to construct a structure that will change shape as it extracts kinetic energy from the ...
|
| Newton knowledge of 2nd law | 12/29/2006 |
Q: Did Newton state his 2nd law of motion as F=Ma OR as F=dP/dt? I know the second is more general ,but ...
A: It is my understanding that Newton would have developed the 2nd Law from the point of view that the ...
|
| work? | 12/29/2006 |
Q: I have a simple question. Energy is said to be conserved, and work equals energy. However, when a ...
A: You are correct that no work is done on the wall, but that does not mean that energy was expended. ...
|
| Matter and Energy | 12/25/2006 |
Q: Is it possible to explain all phenomenons in nature in terms of pure energy only? Is it possible ...
A: Boy do you ask a lot! Mass and energy are believed to be just different sides of the same coin! And, ...
|
| Reflection of light | 12/24/2006 |
Q: During a sunset, when the sun is already below the horizon, could the light from the sun be ...
A: Easily! Light leaving the sun will strike the water's surface and will reflect off such that the ...
|
| help plz | 12/21/2006 |
Q: here thewhy is the water supply tank in a town made at suffiecient ht.?my book says its coz then the ...
A: The pressure within a liquid is directly proportional to your depth in the liquid. If the storage ...
|
| atomic shells | 12/21/2006 |
Q: Sir i want to know that what are the abriviations of K, L, M, N , names of atomic shells, why these ...
A: They are not abbreviations for anything! They are arbitrary letters assigned to the electron shells ...
|
| fixed pulley | 12/20/2006 |
Q: I have a very simple question. Does a fixed pulley offer any mechanical advantage? I am being told ...
A: The answer depends on how the pulley is used. The angle, however, has nothing to do with it. If you ...
|
| Electromagnet | 12/18/2006 |
Q: How much is the maximum possible practicable Tesla that a solenoid made in lab can generate? How big ...
A: Making an electromagnet in the range of 800-900 Gauss [.08-.09 Tesla] is pretty easy, but anything ...
|
| Newton's rings | 12/17/2006 |
Q: In Newton's rings, sometimes, why the central dark spot does NOT form at the center of the lens ...
A: I would assume that something has kept the two surfaces apart, dirt, oil? The reason for the cntral ...
|
| What unit of length, used in nuclear physics, is named after a famed Manhattan Project scientist? | 12/15/2006 |
Q: What unit of length, used in nuclear physics, is named after a famed Manhattan Project scientist?
A: The "Fermi", named after Enrico Fermi, is a measure of distance. 1 Fermi = 10^-15 meters and is on ...
|
| electricity | 12/14/2006 |
Q: Could you possibly tell me what is happening in a telephone wire for example starting from the power ...
A: I assume you are talking about a traditional land line phone. Land line phones are powered by a ...
|
| Physics | 12/12/2006 |
Q: I am studing this and i would like you to correct my work please 1. A silver bar 0.125 meter long ...
A: I agree with your answers except: 4-B Turbine is there to compress and therefore push more air into ...
|
| Physics | 12/12/2006 |
Q: I am studying this and i need youi to correct my answers please 1. If one body is positively ...
A: I agree with all of your answers except: 2-D V=5*1.5V=7.5V 9-C Electrons are not easily removed ...
|
| maxium wavelength | 12/11/2006 |
Q: When cesium metal is illuminated with light of wavelength 300 nm the photoelectrons emitted have a ...
A: The work function of emitting surface will be equal to the difference between the energy of the ...
|
| Stationary Path? | 12/10/2006 |
Q: I READ SOMEWHERE THAT THE LINE INTEGRAL OF AN ELECTRIC FIELD OVER A CLOSED LOOP (IN CASE OF A ...
A: It's not so much that the path has to be stationary but rather that there must be relative motion ...
|
| physics honors egg drop project | 12/9/2006 |
Q: I have to do an egg drop project for my physics honors class. I was planning to make a cone that has ...
A: 1. The sum of the forces on the falling egg will be equal to the rate of acceleration. In this case ...
|
| resistnace | 12/8/2006 |
Q: for a certain RLC circuit the ac voltage generated is 125 V and the current is 3.20 A. if the phase ...
A: The inductive reactance and capacitive reactance are both perpendicular to the resistance. The ...
|
| hello expert james | 12/8/2006 |
Q: Can you please, pls. help me with this.i have a hard time here..u A golf ball undergoes 3 successive ...
A: 1. First draw an arrow north 15 units long. from that point draw a second vector 5 meters long but ...
|
| momentum | 12/7/2006 |
Q: Here is a puzzler. When a gun is fired the momentum before firing must equal momentum after, or 0=0. ...
A: As you have suggested the momentum [as well as the kinetic energy] of the bullet will be greater if ...
|
| Electromagnet | 12/7/2006 |
Q: Is a electromagnet and solenoid the same thing? Can there be an electromagnet without winding(i.e. ...
A: A solenoid is a particular kind of electromagnet characterized by being a coil whose length is much ...
|
| Simple Harmonic Motion | 12/5/2006 |
Q: Hey Mr. Kovalcin, I'm having some trouble with this question... please help! A steel cable, of ...
A: The speed of a wave through a string, wire etc. is given by v=sqrt[Tension/(mass per unit ...
|
| physics help | 12/4/2006 |
Q: Light of wavelength 550nm is incident on a diffraction grating. If the third order bright fringe is ...
A: The relevant relationship here is: n*lambda=d*sin(theta) where n is the order of the antinode, ...
|
| Physics | 12/3/2006 |
Q: Does Total Internal Reflection occours in case of Sound Waves? ...
A: I have never tried it, but I would assume that sound should follow the same rules as any other wave. ...
|
| nuclear physics | 12/2/2006 |
Q: YOUR ANSWER EXPLAINED WHY 2 PROTONS DO NOT COLLAPSE INTO EACH OTHER,THANKS FOR THAT.I WOULD ALSO ...
A: Keep in mind that the "Normal Force" does not exist in its own right, but is rather the result of ...
|
| regarding air as good insulators | 12/2/2006 |
Q: I want to ask why air is a good insulator and what are some experiments I can perform to prove that?
A: Air is a good insulator because it is a very poor conductor. What this means is that the electrons ...
|
| bullet velocity | 11/30/2006 |
Q: Is it possible for a bullet fired from shoulder height at a near horizontal angle to reach a higher ...
A: I would think that that would be very unlikely. Although gravity will be accelerating the bullet ...
|
| nuclear physics | 11/30/2006 |
Q: Normal reaction is an electromagnetic force.Is it true to say that it is the normal reaction between ...
A: The reason that protons two protons do not collapse into one another is due primarily to the ...
|
| kinetic energy | 11/27/2006 |
Q: My name is Viridiana Delgado and i am a high school student at Porter High School. Is it possible ...
A: Batteries don't store "kinetic" energy, but they do store potential energy in the form of chemical ...
|
| Optics related | 11/26/2006 |
Q: What is the retinal size fo a 10 m high building and 25 m away? Suppose that the effective diameter ...
A: The ratio of the distance of the object from the lens to any given dimension of the object will be ...
|
| machanics | 11/26/2006 |
Q: A marble is set pinning around the inside of a frictionless cone whose sides slope at an angle of ...
A: The sum of the forces acting on this marble will be equal to the mass of the object times the ...
|
| Physics and the Environment | 11/24/2006 |
Q: I"m a student in second year high-school and I need something about Physics and the environment. To ...
A: 1. Nuclear fusion - For all practical purposes an unlimited source of energy. A prototype Magnetic ...
|
| Is it possible to send Messages Backward in Time by using Tachyons ? | 11/23/2006 |
Q: My question would be about Tachyons. It is stated that, because of their superluminal speeds, (v > ...
A: First, don't over estimate my expertise in this area. However, as far as I know no one has ever ...
|
| Measuring the Acceleration Due to Gravity with a Speaker | 11/22/2006 |
Q: If the ball bearing has mass m, find N(t), the magnitude of the normal force exerted by the speaker ...
A: Interesting problem. My first thought is that that acceleration of the ball due to gravity is NOT ...
|
| Seeing atoms | 11/22/2006 |
Q: Do we have any means to actually see an atoms, or is that simply not possible? -----Answer----- It ...
A: In order to see something very small, like an atom, you will need to use a wave or particle that has ...
|
| Seeing atoms | 11/21/2006 |
Q: Do we have any means to actually see an atoms, or is that simply not possible?
A: It all depends on what you mean by "seeing". If you mean will we ever be able to "see" atoms ...
|
| Floating a barge | 11/20/2006 |
Q: Kovalcin, We want to constuct and float a barge on a 10m deep water. The carrying capacity of the ...
A: The buoyancy force on he barge will be equal to the weight of the water displaced by the barge. In ...
|
| Projectile Motion | 11/19/2006 |
Q: What are the formulas of Projectile motion, how do I use it and when do I use it alomg with finding ...
A: Two dimensional kinematics problems can be solved using the same techniques used in one dimensional ...
|
| orbital problem | 11/19/2006 |
Q: I am having lots of problems with orbital problems and general gravity problems, and it would be ...
A: The orbit of an orbiting satellite will be determined by Newtons 2nd Law. [The sum of the forces is ...
|
| Phaser on stun - Energy gun calculation | 11/18/2006 |
Q: Apparently, my Sons teacher was tired of a discussion "during class" about a video game and ...
A: Still not really sure. If the energy usage is 293 per shot and since there are 2 shots per second, ...
|
| Phaser on stun - Energy gun calculation | 11/18/2006 |
Q: Greetings. I would really appreciate the help with my sons problem . . . which I happily volunteered ...
A: The first question I would have to ask is what are 293, 1173 and 586? Without units it is impossible ...
|
| physics | 11/17/2006 |
Q: Sir,I am a student interested in Quantum Physics.Which course in physics is suitable for me after ...
A: Unfortunately, there is not much opportunity to study quantum mechanics until you have studied quite ...
|
| Coefficient of friction | 11/16/2006 |
Q: If you use a horizontal fore of 30.0 N to slide a 120-kg wooden crate across a flour at a constant ...
A: If the crate is sliding across the horizontal surface at a constant speed it must be at equilibrium. ...
|
| negative charge | 11/15/2006 |
Q: An airliner is cruising in level flight over the south magnetic pole. Which of the wingtips (left or ...
A: The left wing tip should be negative. The magnetic field at the South Pole should be pointing ...
|
| physics help | 11/13/2006 |
Q: A singly charged positive ion having a speed of 3.1*10^6 m/s enters a magnetic field of 0.46 T along ...
A: This is a Newton's 2nd Law problem where the sum of the forces acting is equal to the product of the ...
|
| impulse and momentum | 11/13/2006 |
Q: A baseball (m = 149 g) approaches a bat horizontally at a speed of 43.0 m/s (96 mi/h) and is hit ...
A: According to the impulse equation: F*Dt=m*Dv where Dt is the time interval over which the change ...
|
| Two objects over a cord | 11/11/2006 |
Q: Two objects (m1 and m2) are connected by a massless cord that passes over a frictionless pulley. M2 ...
A: This is, of course, a Newton's 2nd Law problem. Therefore, the sum of the forces acting on the ...
|
| Physics - Springs and Harmonic Motion | 11/7/2006 |
Q: Hey there, I'm having much trouble with this problem, and to begin with, I'm not sure how to ...
A: There are two distinctly different approaches to this problem: energy conservation and simple ...
|
| electromagent | 11/7/2006 |
Q: I am building a small (5x5x5cm) electromagnet. I am trying to find out what core material and size ...
A: Plain old "soft iron" would be your best choice. The function of the magnet wire will be to align ...
|
| Ingration of Equation of Motion | 11/5/2006 |
Q: The acceleration of a particle is given by a= A times the (Square root of t) where A= 2.0 m/s^(5/2). ...
A: If the acceleration is a=A*t^1/2 the velocity will be given by the integral [or antiderivative if ...
|
| spontaneous combustion? | 11/4/2006 |
Q: Whenever I have a tree trimming service deliver a pile of fresh cut mulch (green) it burns and ...
A: I'm not quite sure what it is about this that you don't understand. Organic matter in the presence ...
|
| coefficent of friction | 11/3/2006 |
Q: A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s squared. Determine the ...
A: This is, of course, a Newton's 2nd Law problem. This means that the sum of the forces in the ...
|
| Projectile Launching | 11/2/2006 |
Q: I have a very urgent question that needs to be answered. A projectile is on a 0.3 m plateau. If you ...
A: All problems of this type can be solved in the same way! Set up two data tables: one for the ...
|
| Earth's spin | 11/2/2006 |
Q: Kovalcin, I'm in Physics AP, high school, and was struggling with a problem. Any help would be ...
A: The first part is pretty easy. Since the circumference of the earth is about 40,200 km ...
|
| Projectile Motion | 11/1/2006 |
Q: A stone is thrown diagonally upward with a vertical velocity of 23 m/s and lands 83m away at the ...
A: All problems of this type can be solved in the same way! Set up two data tables: one for the ...
|
| toaster design | 10/31/2006 |
Q: how does electricity contribute to the process of a toaster and how does technology and science ...
A: As electrical current [charge] flows through the circuit that makes up a toaster the electrons ...
|
| The helicopter | 10/29/2006 |
Q: A helicopter takes off from it's landing pad at 6:00 am and begins hovering vertically about 1000 ...
A: You are overlooking two important issues. 1. The helicopter is moving along with the surface of the ...
|
| calculating useful energy output | 10/29/2006 |
Q: In a lab excercise where a 1.1 kg sample of water with an initial temperature of 12 degrees celcius ...
A: To calculate the usefule energy output you would do just as you have said, ...
|
| How to find out the neutral point of the B-field? | 10/28/2006 |
Q: I think it is so difficult to find out the neutral pt. For example two bar magnets placed side by ...
A: Since the magnetic field is a vector quantity, there will be locations in space where the magnetic ...
|
| graviton | 10/27/2006 |
Q: Is there anyone in the world that is crazy enough to fund a study on graviton and reap the benifits? ...
A: But there ARE people doing research on gravitons. Why would you believe otherwise. And who says its ...
|
| magnetic field | 10/23/2006 |
Q: what is the effect of magnetic field on atoms?on cells?on body organs?and on blood?
A: In general the effect of the normal kinds of magnetic fields we encounter every day on living ...
|
| Physics Question | 10/22/2006 |
Q: My question maybe simple for you to answer but I dont understand it. Can you please help me answer ...
A: The heat lost by the gold will be equal to the heat gained by the water. The heat gained by the ...
|
| belt tension gauge | 10/21/2006 |
Q: how does a belt tension gauge measure tension from a perpendicular force? is there some spring or ...
A: The gauge would measure the force needed to deflect the belt. This can then be translated into a ...
|
| ooblek | 10/21/2006 |
Q: Is Ooblek a solid or liquid. In case you don't know what ooblek is ooblek is a mixture of cornfour ...
A: Ooblek is a so called "non Newtonian" fluid. See http://www.answers.com/topic/non-newtonian-fluid ...
|
| scale bench tests | 10/20/2006 |
Q: Kevin is on vacations, I was told to pick another expert. Per his answer, I am forced to conclude ...
A: I am not exactly clear what it is that you are asking. On one hand the scaling concept applies in ...
|
| archimedes | 10/19/2006 |
Q: ------------------------------------------- The reason I asked the question (and I sincerely thank ...
A: Now that I know what you are talking about I agree that the addition of a boat will not increase the ...
|
| Magnetic Fields | 10/16/2006 |
Q: Do perpendicular wires exert magnetic forces on each other? If each wire carries a current does it ...
A: If two wires are perpendiular to one another and are both carrying current the wires will exert ...
|
| Atomic # & Masses | 10/15/2006 |
Q: Can you tell me what would happen to the atmoic number and mass number of a nucleus when it emits a ...
A: If the nucleus emits a gamma ray the nucleus will lose energy but the atom remains the same. If an ...
|
| mass | 10/14/2006 |
Q: An object of mass 3m, initially at resr, explodes breaking into two fragments of mass m and 2m. ...
A: When an explosion occurs and two pieces arre produced, the kinetic energies of the particles will be ...
|
| What is the acceleration? | 10/11/2006 |
Q: In a velocity graph the question what is the acceleration is asked, now how would I answer that ...
A: Acceleration is the rate of change of velocity or a=Dv/Dt [where D means change in]. If you have ...
|
| physics (velocity/distance) | 10/10/2006 |
Q: I need help finding the formula that will enable me to solve the following problem: A bowling ball ...
A: The time for the ball is only dependent on the vertical motion of the ball. In this case the initial ...
|
| Combustion | 10/8/2006 |
Q: Could you describe, in subatomic terms (nuclei and electrons), what happens in a combustion ...
A: Chemical energy exists in the form of the electrostatic bonds between protons and electrons. If the ...
|
| Case 2 Projectile Motion | 10/7/2006 |
Q: i was wondering how to go about proving these two equations for case II projectile (object lands at ...
A: Someone else also asked this question today! [Quite a coincidence I would say.] To solve a 2 ...
|
| radiation | 10/6/2006 |
Q: This is for a science project: Approximately, how many RAD would be produced in an x-ray machine ...
A: Your question does not make sense. A RAD is a measure of the amount of energy deposited per unit of ...
|
| gravity | 10/4/2006 |
Q: My nine year old son asked me if gravity contains atoms. He said he had been thinking about it for ...
A: There are a number of explanations for the gravitational force. Here is one such explanation. Any ...
|
| physics concept on direct current circuits | 10/4/2006 |
Q: If electrical power is transmitted over long distances, the resistance of the wires becomes ...
A: As electrical current flows through wires enery is dissipated within the wires according to P=I^2*R. ...
|
| Where does the charge of an Electron come from ? | 10/3/2006 |
Q: I am just studieng the book „The secret of the creative Vacuum“ by John Davidson, there at chapter ...
A: I really wish I was worthy of your confidence, but you are refering to the very threshold of our ...
|
| Weight Transfer | 10/2/2006 |
Q: Why does the weight of a car move to the front when the brakes are applied or move to the back when ...
A: First of all, the force of the roadbed on the car is determined by the force of gravity acting on ...
|
| Egg Drop | 10/1/2006 |
Q: In my physics class, we did the classic egg drop project. Me and my partner used a paint bucket ...
A: I suspect that fine sand may have worked as well. When the bucket struck the ground the egg had to ...
|
| Impact Wrench | 10/1/2006 |
Q: How does a impact wrench work? Make a linear motion of hammer into a rotational motion of a socket? ...
A: Am impact wrench works by making use of the concept of "impulse". Ordinarily we view Newton's 2nd ...
|
| What would we see, if we could travel at the speed of Light ? | 9/30/2006 |
Q: My question is about travelling at the speed of light. If I could travel exact at the speed of ...
A: Since we CANNOT move at the speed of light, let's consider, instead what happens if you are moving ...
|
| experimental work | 9/29/2006 |
Q: http://www.filefactory.com/file/5c5e6f/ i have uploaded the microsoft excel file to the website ...
A: Sorry, but I cannot see how to access the file. There is a description but no obvious link?!? "File ...
|
| experimental work | 9/28/2006 |
Q: i did an experiment which produced a graph with a curve that looked like an exponential graph. what ...
A: A little difficult to answer without seeing the curve. If you have made the graph use a ruler to ...
|
| resultant of 4 vector | 9/28/2006 |
Q: Given four vectors, 1 m E, 3 m N, 5 M 37 degree N of W, and 6m 37 degrees W of S. What is the ...
A: Break each vector into x and y components: x direction - 1m y direction - 3m 5m@37oNW x direction - ...
|
| Physics:lenses | 9/25/2006 |
Q: 1. Can a concave lens be use as an eyepiece in a microscope? Explain. 2. Can the parallel ray method ...
A: 1. You can, but would you want to? A concave lens would cause the emerging light rays to diverge and ...
|
| atom | 9/25/2006 |
Q: What does "Splitting an atom" mean? Is an atom literally split in half? And how does this release ...
A: Yes, the atom literally splits into two or more smaller pieces. [Not necessarily in half!] How does ...
|
| Average force | 9/24/2006 |
Q: An oblect is falling from a height of 30 meters(it weighs .5 kilograms). It bounces back up for 20 ...
A: If the object fell from a height of 30 meters, its velocity when it strikes the ground can be ...
|
| football | 9/22/2006 |
Q: This is a physics question about football. Since I am not familiar with American football, I have ...
A: The fact that this is about American football is not really important. What is important is that two ...
|
| physics coefficient | 9/22/2006 |
Q: Could you please give me an equation to use on this question..... A hockey puck leaves a player's ...
A: The easy way to do this is to use energy conservation! The puck intially has kinetic energy. As the ...
|
| physics | 9/21/2006 |
Q: How does the egg drop project relate to physics?
A: The initial gravitational energy of the egg becomes kinetic energy as it falls and then this kinetic ...
|
| Expansion | 9/20/2006 |
Q: If I place a brass plate with hole in the middle of it in boiling water and the plate expands, why ...
A: All dimensions will get bigger! Therefore, the diameter of the hole, along with all of the other ...
|
| Light - Infrared Pass Filter | 9/20/2006 |
Q: I want to know is it true that if we used an IR pass filter in combination with night shot enable ...
A: The wavelength of the IR filter and the sensitivity range of the camera are both important. In ...
|
| pascals and kg/m^2 | 9/19/2006 |
Q: Why doesn't the pascal (unit of force) equal the same as kg/m^2? Just because we convert a kilogram ...
A: The Pascal is a measure of pressure. Pressure is force per unit area. The metric unit for force is ...
|
| Kinetic enrgy / absolute frame of reference | 9/19/2006 |
Q: Doesn't the kinetic energy formula require an absolute frame of reference? If two balls in the ...
A: The kinetic energy of a moving object is NOT absolute. It is, in fact, ddependent on the speed of ...
|
| physics | 9/16/2006 |
Q: This is not homework. I realize that color is related to the electro magnetic frequency. If someone ...
A: he white light coming from a flashlight contains a combination of many different frequencies. When ...
|
| Weights | 9/15/2006 |
Q: I asked another expert this question and he replied that he wouldn't answer homework problems. This ...
A: First of all I do bot agree at all with your assessment of the tractor trailer full of canaries. ...
|
| electric potential i think | 9/14/2006 |
Q: i have is physics problem that i'm having hard time figuring out.. can u help me? A charge of ...
A: The electrostatic potential between these two charges initially is given by V=kq1q2/r, which in this ...
|
| projectile motion | 9/14/2006 |
Q: A tiger leaps horizontally from a 7.5m high rock with a speed of 4.5 m/s. How far from the base of ...
A: All two dimensional projectile problems can be solved using the same technique. There are 6 relevant ...
|
| Maths course for Physics | 9/8/2006 |
Q: I would like to apply for a mathematics course because next year would like to go to university and ...
A: The answer depends more on the particular physics course you are going to take. There are physics ...
|
| egg drop | 9/7/2006 |
Q: my partner and i have to build an egg dropping device. our materials are limited to wood (with a ...
A: The idea will be to build a structure that breaks when contact is made with the ground without ...
|
| Electric Potential at a point | 9/6/2006 |
Q: According to the definition of potential at a point, it is the work done in moving a unit positive ...
A: It means exactly what you have said. If you apply a force to a positivecharge and using that force ...
|
| speed | 9/6/2006 |
Q: What would happen if a car pulling a trailer was going 55mph another car was going just fast enough ...
A: What you describe is conceptually possible and has seemingly been done in movies, but would be very ...
|
| Electromagnet | 9/5/2006 |
Q: How to make a solenoid of 15000 gauss strength in lab ?
A: Unless you have LOTS of money, time and support, it just isn't going to happen! The world record ...
|
| magnetism | 9/4/2006 |
Q: can i use alminium for weaken flux density in one side of a permanent magnet? and how can i same ...
A: Aluminum will not have a realistically measurable effect on the magnetic flux. It's effect is just ...
|
| ice | 9/2/2006 |
Q: Suppose you have a container made of the strongest material on Earth. Now, you open that container ...
A: If the container is infinitely strong and will not expand, I would assume that the water would not ...
|
| Newton's Laws | 8/31/2006 |
Q: An object moves in an eastward direction at a constant speed. A net force directed nortward acts on ...
A: Initially, your object was moving eastward. A northward directed force cannot change that. On the ...
|
| Newton's Laws | 8/29/2006 |
Q: An object moves in the eastward direction at constant speed. A net force directed northward acts on ...
A: Initially, the object has a velocity east. After applying the northward outside force for 5 seconds ...
|
| perpetual motion | 8/29/2006 |
Q: is our solar system a form of perpetual motion? my son is trying to do a report on motion. I ...
A: The solar system will continue in its curretn motion for quite a long time [billions of years] but ...
|
| Karting | 8/28/2006 |
Q: Paul here from NZ. I've been racing go karts and recently aquired a shifter kart equipped with a 6 ...
A: First, convert mph to meters/second by dividing by 2.24 v=100/2.24=44.6 m/s Next, acceleration is ...
|
| Traveling faster than light- Is it possible? | 8/27/2006 |
Q: I understand that in our present universe of 4 dimensions that it is impossible to travel faster ...
A: Let me put it this way! NOTHING has ever been measured to go faster than the speed of light. Your ...
|
| electricity | 8/25/2006 |
Q: Suppose a point q1 is in the electric field & a unit positive charge q2 is at infinite distance from ...
A: Much of the wording of what you say is not correct. For example, the potential at q1 cannot be ...
|
| elevator coin drop | 8/23/2006 |
Q: a man in an elevator drops a coin and it takes 6 seconds to hit the floor. Will the time increase ...
A: The only way that it could take 6 seconds for the coin to hit the floor is that the elevator is ...
|
| Centripetal Acceleration | 8/22/2006 |
Q: If you were to spin a bucket of water above your head in a circle, the water (which is free to fall ...
A: According to Newton's First Law, an object in motion will continue to move at a constant speed in a ...
|
| physics | 8/22/2006 |
Q: what is the exact ans if some body asks what is particle nature and wave nature? do photons have ...
A: When we try to describe nature, there are two distinct models that seem to best explain reality: the ...
|
| Physics | 8/20/2006 |
Q: how can i design a wooden contiainer to protect and egg during an eggdrop experiment where the egg ...
A: YOu will need to design the container so that when the egg collides with the ground their is a ...
|
| Alpha decay | 8/20/2006 |
Q: s suppose a nucleus undergoes alpha decay by emitting two neutrons and two protons I want to ask ...
A: Alpha decay is actually a special case of fission. Fission occurs because a nucleus is too large for ...
|
| Pushy Load | 8/19/2006 |
Q: So how much force will be required to move a mass of 1 ton weight over a frictionless surface, in ...
A: NO force is required to move a 1 ton or even a 1 billion ton mass across a frictionless, horizontal ...
|
| electricity | 8/18/2006 |
Q: i dont understand the concept of the parallel plate condenser.in it how can the potential of an ...
A: A capacitor is any electrical component whose primary goal is to store charge. In a way this ...
|
| science | 8/18/2006 |
Q: a temperature of 200 F is equivalent to approximately
A: When converting a Celsius temperature to a Fahrenheit temperature you have to first convert the ...
|
| A straw trough a tree during a tornado? | 8/17/2006 |
Q: thanx for the answer James, but a straw is weaker than a pencil and a tree is stronger than a 1/2" ...
A: I really can't say! I know that a straw CAN be used to kill! Moving fast enough and with enough ...
|
| egg drop project | 8/15/2006 |
Q: I am required to design a protection for raw egg so that the egg does not break when the contraption ...
A: I would suggest taping the paper into many different pockets of air! When the "contraption" hits the ...
|
| electrostatics, using coulomb's law | 8/14/2006 |
Q: I am finishing up my physics class and we are working on electrostatics, but no one can seem to ...
A: According to Coulomb's Law the force between two charged particles is given by F=k*q1*q2/r^2 where ...
|
| egg drop | 8/12/2006 |
Q: My son needs to make a contraption for an"egg drop." It will be dropped from a ladder and the egg ...
A: You want to build the structure from something that will "break" upon contact with the ground, but ...
|
| work & energy | 8/11/2006 |
Q: I am just a curious person. What I would like to ask is about the concept of work & energy, since ...
A: What it comes down to is this. If you apply a force to some object and if, as a result of that ...
|
| laser magnetism | 8/9/2006 |
Q: I currently am a senior in high school and am very curious about physics. I know that an ordinary ...
A: How you generate the light in a laser has nothing to do with the normal properties of light. As you ...
|
| uniformly accelerated motion | 8/8/2006 |
Q: Can you determine the acceleration due to gravity by dropping a feather? Why or why not?
A: Doing so would be possible, but it would be very difficult. The problem here is that the frictional ...
|
| electricity | 8/6/2006 |
Q: When the current goes through 2 resistors, in a series circuit doesn't the current decrease. how ...
A: Two characteristics are need to describe an electric circuit: current and voltage. Current is a ...
|
| altimetry | 8/6/2006 |
Q: I know you know nothing about this facet of physics but if you look at this web site: ...
A: Completely reasonable! The gravitational force at a point on the surface of the earth is determined ...
|
| rotational equilibrium | 8/4/2006 |
Q: why does a long pole help a tightrope walker stay in balance?
A: There is something in physics called Newton's 1st Law of Motion which states that an object at rest ...
|
| water | 8/3/2006 |
Q: Why can some people float and others can't?
A: Whether someone can float or not is determined by their average body density. If your average ...
|
| Egg Drop Challenge | 7/31/2006 |
Q: I'd like to know how I can drop an egg 5 metres high without breaking it. Thank You Jen
A: What you need to do is to build a structure around the egg such that the structure will undergo ...
|
| vectors at a point | 7/8/2006 |
Q: 1.what is the minimum number can i add for r=0?and how are the vectors related? 2.is analytical ...
A: 1. Not quite sure what you are asking here!?! 2. The general assumption by most people is that ...
|
| Applying mAh's signifcance to technology | 7/8/2006 |
Q: Mr. Kovalcin, mAh stands for "milliamp hour." I currently have a laptop whose battery I want to ...
A: Amperes time hours is equivalent to current times time. If current is in Amperes and time is in ...
|
| fulcrum | 7/7/2006 |
Q: I would like to ask about the fulcrum. bcoz in monday im going to report about it and i know how am ...
A: May I suggest a demonstration where you use a lever and fulchrum to lift something quite impossible ...
|
| physics | 7/6/2006 |
Q: In a college homecoming competition, 16 students lift a sports car. While holding the car off the ...
A: 16 times 400N = 6400 N. To find the mass of the car divide the force needed to lift the car by the ...
|
| Earth's Rotation | 7/5/2006 |
Q: Imagine i am able to fly and i raise myself 59 metres above the earth's surface and stay afloat in ...
A: If all you did by "flying" was to raise yourself above the ground, I would assume that you continued ...
|
| air hockey tables | 7/5/2006 |
Q: how does an air hock table work using air
A: The air moving through little holes in the surface of the table keep a continuous layer of air ...
|
| power | 7/4/2006 |
Q: Would you please answer it How can we make use of the power that binds molecules of woter
A: When an acid is added to a base the result is always a salt plus water. [For example Sodium ...
|
| Types of Motion | 7/3/2006 |
Q: what are differnt kinds of motion ?
A: Motion falls into three general categories: uniform, accelerated & other. In uniform motion an ...
|
| current & magnetic field | 7/3/2006 |
Q: As we know if a 'North Pole' of a "Bar Magnet" is moved towards a circular closed loop of a coil ...
A: This problem involves the use of Lenz's Law. "If the magnetic flux within a closed conducting path ...
|
| current electricity | 7/1/2006 |
Q: where in metals are free electrons present?
A: The atoms in a metal are bonded together by what are called "metallic" bonds. These bonding ...
|
| Physic | 6/30/2006 |
Q: how i see?
A: Light enters your eye through the cornea. The cornea combined with the lens of the eye forms a real ...
|
| electromagnetic waves | 6/30/2006 |
Q: what are the badd effects ang good effects of radiowaves, microwaves and infrared in human
A: As far as is scientifically known, the only way that the named types of radiation interact with the ...
|
| Kinematics | 6/28/2006 |
Q: This is a kinematic question in which I have tried all possible assumptions.The question says:A ...
A: It seems to me that there is one variable too many! The final displacement of the raft will be given ...
|
| Magnitisim | 6/27/2006 |
Q: sorry that just seems a bit to complicated for me!How does magnitisim work? Answer - I'm not sure ...
A: How about this! All magnetism is caused by moving charged particles. As electrons orbit around their ...
|
| Physics | 6/24/2006 |
Q: A ditch 2.5 m wide crosses a trail bike path. An upward incline of 15o has been built up on the ...
A: To solve a two dimensional kinematics problem such as this break this problem into 2 parts: vertical ...
|
| Electrons | 6/23/2006 |
Q: James, Forgive my ignorance, but I would like to undertand something: If we have basically 100 ...
A: You are correct in that all matter around is made up of the same particles. It is the pattern of ...
|
| How Can I build a useful Periscope? | 6/22/2006 |
Q: I need incormation or someone who can answer questions such as " given two tubes one of 2" and one ...
A: I would suggest contacting Edmund Scientific - They have many different lenses and mirrors ...
|
| collision between ALL and NOTHING results with supernovae creation | 6/20/2006 |
Q: imagine you have two equal weight on a libra on equal and opposite distance in equilibrium. if you ...
A: Sorry, but I just do NOT agree with your assertions at all! As far as your opposite torques are ...
|
| Deacceleration | 6/20/2006 |
Q: .. NOT HOMEWORK! NOT HOMEWORK! NOT HOMEWORK! A solid sphere has these characteristics -- mass = ...
A: Since you know how much the period of the star is decreasing all you have to do is divide the ...
|
| fusion ? | 6/19/2006 |
Q: I have read this news about a machine of the Sandia Lab which obtains 2 billion degrees: ...
A: The question is not whether or not fusion can occur. At 2 billion degrees fusion is easy. What isn't ...
|
| Planck's OCnstant | 6/18/2006 |
Q: How does classical physics come up short in explaining what Planck had tried to explain, that the ...
A: The central point in Black Body Radiation was that the radiation output of such a radiator could not ...
|
| Torque | 6/18/2006 |
Q: Level:grade 12th,India Can it be possible that no net torque is being applied on the body but the ...
A: Not that I can see. If there is no net torque or net force it would seem to be impossible for any ...
|
| RAIN | 6/15/2006 |
Q: Can the falling of rain be ACHIEVED by EXPLOSION methods, and if so?, has this task ever been ...
A: Not quite sure what you mean! Are you refering to causing it to rain? If so, yes many different ...
|
| heat | 6/14/2006 |
Q: Can you please check my answers. My teacher gave me a list of 200 questions to study, but I lost ...
A: 1. The change in length DL is given by DL=alpha*Lo*DT=alpha[of silver}*0.125m*[200-100] Then add ...
|
| Two-point sources for light waves | 6/8/2006 |
Q: A two-point source has a frequency of 1.0Hz to produce an interference pattern in a ripple tank. The ...
A: The angle at which two point sources produce nodes can be predicted from n*lambda=d*sin(theta) where ...
|
| singing | 6/8/2006 |
Q: I am trying to become a good singer and I just have tons of questions about the science behind ...
A: Your music teacher is right! It sounds like you are trying to force your vocal chords to vibrate at ...
|
| black holes | 6/7/2006 |
Q: i a medical student interested in physics. i wnat to know about the black holes.
A: A black hole is a star whose escape velocity is equal to or greater than the speed of light. As a ...
|
| What is the size limit for spiky objects? | 6/6/2006 |
Q: What are the largest natural objects that can have a spiky and sharp shape? The biggest I can think ...
A: As objects get bigger there comes a point where the gravitational force becomes so great that a ...
|
| quantum | 6/6/2006 |
Q: what is the meaning (teleportation)? what is the new exparment about that? how can we do that? what ...
A: "Teleportation" is a method whereby a particle in one location is transfered identically to another ...
|
| buoyancy and load capacity of a barge | 6/2/2006 |
Q: We have a barge that is constructed from an 8' diameter x 33' long steel "pipe". It is split in ...
A: The buoyancy force acting on the barge will have to exceed the barge's weight. The weight will be ...
|
| Every Day | 6/2/2006 |
Q: I have two questions relating to the everday phenomena. 1.)Mosquitors largely got stucked to my ...
A: 1. I would guess that the mosquitoes are killed by the hot ends of the tube. [Just guessing here!] ...
|
| paradox for electricity | 6/1/2006 |
Q: The increasing brightness of the bulb is an indication that the temperature of the bulb filament ...
A: I think you are mixing "apples and oranges" in problem 44. As the temperature of the nichrome ...
|
| physics | 6/1/2006 |
Q: 1. What are the forces acting on the egg as it falls? 2. How can you control the forces that cause ...
A: 1. As it falls, the only force of any significance acting on the egg is the force of gravity. 2. You ...
|
| photons | 5/31/2006 |
Q: I am a GCE A level student from Nepal.I would be very grateful to you if you can define the photon ...
A: When we try to describe light, as in the description of anything unfamiliar, we use familiar ideas ...
|
| resultants | 5/31/2006 |
Q: Two 30.-newton forces act concurrently on an object. In which diagram would the forces produce a ...
A: (3) is the correct answer. When you add the two vectors together, tip-to-tail, the resultant vector ...
|
| electromagnetism | 5/28/2006 |
Q: i have done an experiment about electromagntism investigate how the strength of an electromagnetism ...
A: When you pass current through the wire wrapped around the nail [which is a ferromagnetic material - ...
|
| Suspension Bridges | 5/24/2006 |
Q: what are the forces acting in a suspension bridge? Thanks
A: The two towers typical of a suspension bridge provide a lifting force. The cable between the two ...
|
| bubbles | 5/23/2006 |
Q: Just wondering why it is that bubbles form in water, why they float to the top, and why they don't ...
A: The "surface tension" of the bubble is sufficient to hold the bubble together. To make a really ...
|
| electron | 5/21/2006 |
Q: can you help me with this? Tem 1 A electron with a velocity v moves in a homogenate magnetic field ...
A: Talk about making an easy problem sound difficult! When a charged particle enters a u niform ...
|
| physics | 5/20/2006 |
Q: A string of 18 identical holiday tree lights is connected in series to a 190 V source. The string ...
A: If the applied voltage is 190 Volts and the power dissipated is 60 Watts, the required current flow ...
|
| Sound neutalizing | 5/20/2006 |
Q: I believe many aircrafts will use some sort of sound system that records the sound of the engine or ...
A: Noise cancellation is indeed an up and coming technology! Automobile manufactureras are already ...
|
| Exam question-acceleration | 5/17/2006 |
Q: Having sat a physics final exam there was one multiple-choice question I would like to see if I got ...
A: If the elevator is accelerating upward, the force of the scale on the person standing on the scale ...
|
| Wheelbarrow dynamics Challenge | 5/16/2006 |
Q: Why is there no torque and what is minumum info needed to find the net force(including lifting plus ...
A: Unless the wheel barrow is accelerating rotationally about the front wheel, the NET [unbalanced] ...
|
| tell.youlater@hotmail.com | 5/15/2006 |
Q: Can you hep me with this also. we'll please check if I am right? we know imagine the system ...
A: I would not approach the problem that way. I would use energy conservation such that the ...
|
| Wheelbarrow dynamics Challenge | 5/15/2006 |
Q: I have some questions dealing with the dynamics how a wheel barrow works. How do I find the normal ...
A: This problem should be solved using opposite torques at equilibrium. Make the center of the wheel ...
|
| please help me solve this question | 5/13/2006 |
Q: The disk shown in Figure 1.1 has an index line marked on it. The angular displacement of the disk, ...
A: a. The velocity will be equal to the first derivative while the acceleration will be the second ...
|
| physics....duh! | 5/11/2006 |
Q: Okay, I was discussing this with my world geography teacher, I became really confused (He is an ...
A: I don't really get what you are getting at here. I would say that if a vertical pole in the center ...
|
| physics | 5/11/2006 |
Q: In a given process, 12 joules of heat is added to an ideal gas and the gas does 8 joules of work. ...
A: According to energy conservation all of the energy added to a system will have to be accounted for. ...
|
| physical science: heat | 5/8/2006 |
Q: A silver bar 0.125 meter long is subjected to a temperature change from 200 degrees celcius to 100 ...
A: The change in length of an object is given by DL=Lo*alpha*DT where DL is the change in length, Lo is ...
|
| mechanics | 5/6/2006 |
Q: which one will be more effective in knocking a bear down a rubber bullet or a lead bullet
A: This question cannot be answered with the information given. If you fire both a lead bullet and ...
|
| Physics-momentum energy and projectile motion | 5/3/2006 |
Q: this is high school double honors physics and i am familiar with algebra help me! 1.A block of mass ...
A: Please proof read your questions for correct grammar, spelling and punctuation. 1. I would use ...
|
| Acceleration | 5/1/2006 |
Q: If you find differentiate velocity you find acceleration, and if you differentiate do you find ...
A: The derivative of acceleration, the rate of change of acceleration, is a physical quantity known as ...
|
| light ray | 4/29/2006 |
Q: A ray of light goes from air into Lucite then back into air. Draw the travel of this light ...
A: You have already mentioned Snell's Law, but do you really know what it means conceptually? ...
|
| WTCs Collapse | 4/29/2006 |
Q: Kovalcin, I was not aware that physics was such a speculative science, open to personal ...
A: Who says that classical physics is speculative? I can't speak for Steven E. Jones nor do I know ...
|
| e/m/relativity | 4/28/2006 |
Q: Supposedly in classical e-m an accelerating charge radiates. If so, why? If so, then does an ...
A: As a charge accelerates the momentum of that particle changes. The rest of the universe, however, ...
|
| could you help with these... | 4/27/2006 |
Q: could you help with these four In a cathode ray tube, the number of electrons that reach the ...
A: 1. The number of elecrons that reach the screen will be determined by the current flow. 2.AM radio ...
|
| 3 questions i need help with
... | 4/27/2006 |
Q: 3 questions i need help with A circuit contains two devices that are connected in parallel. If the ...
A: 1. The total resistance of circuit elements in parallel is given by: 1/Rtotal=1/R1 +1/R2 solve for ...
|
| physics | 4/26/2006 |
Q: How much time should be allowed for a 605-mile car trip if the car will be traveling at an average ...
A: 1. Distance is equal to average velocity times time - D=v*t 2. Efficiency is equal to useful work ...
|
| light/physics | 4/26/2006 |
Q: With the pupil of a human eye at a diameter of 8mm, and a car's headlights separated by 1.8m, how ...
A: This limitation is due to what is called the "diffraction limit". When light passes through a small ...
|
| mechanics | 4/23/2006 |
Q: Please help! I have no idea what this stuff is even talking about. I really have no idea on how ...
A: This is a kinematics questio and ALL such questions can be solved using the exact same approach. As ...
|
| Wind resistance and running | 4/23/2006 |
Q: I have a practical question. Yesterday, I ran in a race. I was running at a 9:00 min/mile pace ...
A: I can't be specific, but the frictional force will depend upon: your shape, your cross sectional ...
|
| Magnetic/Electric fields | 4/21/2006 |
Q: Why does a magnet attract a demagnatised ferromagnetic material? (why do fridge magnets stick to the ...
A: Ferromagnetic materials have small scale areas called "magnetic domains". These magnetic domains ...
|
| insulator experiment | 4/18/2006 |
Q: please give an experiment with readings(if possible)to compare the effectiveness of different ...
A: Get hold of some solid metal rods which have the same length and cross section [1/4 inch diameter by ...
|
| forces and acceleration | 4/18/2006 |
Q: A manufacturer’s advertisement claims that their 1,250-kilogram (12,300-newton) sports car ...
A: You are misinterpreting the role of friction here! The frictional force between the tires of the car ...
|
| forces and waves | 4/17/2006 |
Q: If net force is a vector, and f=ma, then if acceleration is negative, why is fnet positive? Because ...
A: It isn't! Why would think it was? Longitudinal sound waves will not necessarily have a constant ...
|
| circuits and resistance | 4/17/2006 |
Q: I hope I'm finding you in the best of health. How does resistance affect a circuit?Without the ...
A: Let's try this from scratch! Every electrical circuit consists of at least two things, and energy ...
|
| Batteries | 4/15/2006 |
Q: Does a fresh, fully-charged battery weigh more than a flat battery and if not, why not! Thanks in ...
A: In theory, yes, in practice, no! Theoretically, as a battery does work on an electrical circuit the ...
|
| lab experiments | 4/12/2006 |
Q: I am studying by correspondence physics B and I desperately need to practice in a laboratory because ...
A: Unfortunately, the only way to learn lab skills is to do lab work! What is your current students ...
|
| Nuclear Reactions | 4/10/2006 |
Q: In the example where a radium-226 atom releases an alpha particle leaving the atom with 2 extra ...
A: I really don't understand your first comment. When alpha decay occurs 2 protons and 2 neutrons [an ...
|
| Heat | 4/7/2006 |
Q: I was wondering if you wouldnt mind helping me with these questions. 1. A silver bar 0.125 meter ...
A: If you have a question, I will be glad to help. What is your question? [A list of 25 multiple choice ...
|
| Uncertainty principle? | 4/6/2006 |
Q: The phenomenon mentioned I believe is called the uncertainty principle and is this although I may ...
A: You have no ideal how difficult a question you have asked here. It is true that the wave nature of ...
|
| wave particle duality | 4/5/2006 |
Q: An electron microscope uses a beam of fast electrons that are focused by electric and magnetic ...
A: An electron with an energy of 15000 eV will have a velocity of KE = 1/2*m*v^2 solve for the ...
|
| eggdrop | 4/4/2006 |
Q: My daugther is in the 4th grade and is involved in a contest to see who can come up with the best ...
A: What you want to do is to build a containment around the egg that will undergo "controlled ...
|
| Diffraction | 4/3/2006 |
Q: I have read about diffraction through an apperture, where it says you will see bright and dark ...
A: In Young's Double Slit experiment you are correct that n*lambda=d*sin(theta) predicts the antinodes. ...
|
| force & motion | 3/29/2006 |
Q: .#.01:Find the force required to give a block weighting 12lbs,an acceleration 8ft/sec^2. Q.#.02:A ...
A: Q1. According to Newton's 2nd Law the sum of the force applied is equal to the mass times the ...
|
| neutron | 3/28/2006 |
Q: a neutron that moves at right angles to a magnetic field experiences?
A: It should feel nothing since a neutron is neutral and the magnetic force is given by Fm=q*vxB. You ...
|
| physics | 3/27/2006 |
Q: please could you describe how can heat, light, sound & electricity can be reflected, refracted or ...
A: The question, as asked, cannot really be answered as you might intend. Reflection, refraction and ...
|
| water, ice and expansion | 3/26/2006 |
Q: This winter our bird bath froze over. It produced a cone of ice 6cms high above the surface of the ...
A: Th answer is quite simple! When water freezes it expands. In your bird bath, the water first freezes ...
|
| physics | 3/24/2006 |
Q: Not a homework problem...just a random question. I am a freshmen at PLU (Pacific Lutheran University ...
A: I think that you are misjudging the applications of modern physics to modern technology! Today, more ...
|
| quantum mechanics | 3/23/2006 |
Q: I have the following questions to ask.Hope u don't mind many questions in the same email. Level:16 ...
A: 1. ALL magnetism is caused by moving charged particles. If an atom has any unpaired electrons, the ...
|
| physics momentum | 3/21/2006 |
Q: i made a container out of sponge that weighs 52 grams. This container was built to save an egg that ...
A: 1. Time to reach the ground. Use Df=1/2*g*t^2+Vo*t+Do solve for t where Do=4.5m, Vo=0m/s, ...
|
| Egg drop project | 3/19/2006 |
Q: What some principle theorys that apply to the egg drop project? I know of Newton's ...
A: Your goal here will be to dissipate the kinetic energy of the falling egg in some way rather than ...
|
| Quantum+charges | 3/19/2006 |
Q: 2 questions,hope u don't mind.Level:16yr od studying in class 12th.These are not homework problems. ...
A: 1. As far as we know charge is conserved. If there are any exceptions, I am unaware of them. 2. Each ...
|
| speed of light | 3/18/2006 |
Q: Can I use this as an example of how something can move faster than the speed of light? If an ...
A: As far as we know, nothing can go faster than the speed of light in a vacuum. Of course it is ...
|
| physics | 3/18/2006 |
Q: I am a 8th std student.How the strenth of the earths magnetic field changes according to time, ...
A: I can't give you a specific answer because the answer to your question is incredible complex. The ...
|
| Dark matter | 3/16/2006 |
Q: Name one physical manifestation of dark matter.
A: When we measure the speeds of stars orbiting the cores of their galaxies we find that the measured ...
|
| solar panel | 3/15/2006 |
Q: how to build powerful Solar Cells right in your own back yard
A: It is highy unlikely that YOU could build a solar cell. It is entirely practical for you you ...
|
| Electromagnetic Spectrum | 3/14/2006 |
Q: How does E-M radiation give us cancer?
A: [Ionizing radiation strips electrons free from their atoms.] Breaking the bonds in DNA strands and ...
|
| radiation and waves | 3/14/2006 |
Q: what type of radiation affects photographic film through black paper, but does not affect aluminium ...
A: X ray radiation has the capability of penetrating black paper and then exposing film. [This is wwhy ...
|
| Questions about electricity | 3/13/2006 |
Q: you wrote: "As the current flows through the gas the electrons collide with the atoms of the gas ...
A: Friction can be caused by a number of different things: 1. Electrostatic forces between charges ...
|
| Pressure | 3/12/2006 |
Q: As you go deeper down in the sea, the presure on your body increases. But why is it that the ...
A: Imagine for a moment that you are in a swimming pool filled with water. When you are submerged into ...
|
| Increase of magnetic flux | 3/9/2006 |
Q: I need your help on the following: how can you increase the magnetic flux inside a coil-solenoid? I ...
A: Actually, a diamagnetic material is exactly the wrong thing to increase the flux within a solenoid ...
|
| Subway Train | 3/8/2006 |
Q: I realize this is a morbid question, but it is a debate between some friends. If a man was ...
A: From a very morbid, but from a scientific point of view, there are several relevant physics ...
|
| Hutchinson Effect | 3/8/2006 |
Q: I stumbled across this subject recently,and was wondering if you had heard about it,and if so,what ...
A: Sorry, but this sounds and looks like quackery to me! Any time an inventor justifies the inability ...
|
| Diffraction Grating | 3/6/2006 |
Q: I don't seem to quite understand diffraction gratings with white light... Here is how I have tried ...
A: The grating works because the path length different from each slit to a particular bright fringe ...
|
| Object that seem heavier in water than in air. | 3/5/2006 |
Q: Yesterday I was at a local public swimming pool. I noticed an object made of some kind of metal (it ...
A: When an object is submerged in a liguid, the object "pushes" that liquid out of the way. The weight ...
|
| String Theory | 3/4/2006 |
Q: I am a 12th grade high school student who is going to college in the fall as in ...
A: Absolute temperature is that point where it is impossible to extract any more energy from a ...
|
| normal force; follow-up question | 3/3/2006 |
Q: I’d like to ask two follow-ups. 1. I place a box on a plank of wood forming an inclined plane. ...
A: 1. The normal force on the incline that is caused by the box will be exactly perpendicular to the ...
|
| homework help | 3/3/2006 |
Q:
A: Some atoms are unstable. [Much like a vase sitting too close to the edge of a table.] Some of these ...
|
| Egg-Drop | 3/2/2006 |
Q: My senior honors physics class is starting the famous "egg drop" experiment, and our container ...
A: When the egg is dropped the gravitaitonal potential energy becomes kinetic energy. Because of energy ...
|
| re- Time Expanding | 3/1/2006 |
Q: This is my view concerning a recent question that you received, asking if time is expanding. I ...
A: You have stated that this is your "belief" and that is fine. But remember science is about testable ...
|
| Speed of Light | 2/28/2006 |
Q: My English class is making a Encyclopidia of Burning Questions. Each student is required to come up ...
A: As stated, your problem cannot happen. Nothing that has mass can ever go the speed of light!. Only ...
|
| Satellite | 2/27/2006 |
Q: Is a satellite (or any projectile following a curved path) accelerating? So even though a satellite ...
A: First of all acceleration does NOT imply that an object is changing speed. Rather, acceleration ...
|
| Acceleration | 2/27/2006 |
Q: Why is it that when you accelerate in a vehicle, you get pushed into the back of your seat? What is ...
A: Actually what is happening here is not what you think! In order to accelerate anything requires that ...
|
| the normal force | 2/26/2006 |
Q: I wonder if you could help me with a problem I’m having grasping the concept of the normal force. ...
A: When a system is at equilibrium [not accelerating] the opposite forces acting must be equal in ...
|
| Is Time Expanding? | 2/26/2006 |
Q: Is time expanding in some way analogous to the expansion of space? If we talk about the expansion ...
A: This question is really a bit beyond my abiity to explain. May I suggest that you go to my web site ...
|
| kinetic energy | 2/25/2006 |
Q: I hope I'm finding you in the best of health. An average force of 20. newtons is used to pull back ...
A: When you pull back the string of a bow the work done is stored in the tension of the string and in ...
|
| Diffraction Grating | 2/24/2006 |
Q: If you have a diffraction grating with 2 slits and you pass white light through it there is one ...
A: The bright interference bands you are refering to exist only where light waves come together IN ...
|
| Microwawes | 2/21/2006 |
Q: Could you explain scientifically why we can't put any metal in the microwave oven? Also, what are ...
A: In some ways microwaves are like batteries and therefore generate voltages within the microwave ...
|
| kinetic energy | 2/21/2006 |
Q: How does heat affect how fast and how far a ball travels?
A: Hard to answer exactly since there are so many variables. If we assume that only the temperature of ...
|
| Magnets | 2/20/2006 |
Q: I want to ask that how does the magnatic rock is created in nature, what are the natural processes ...
A: The fact is that no one knows for sure. What we do know is that magnetite is made from ferromagnetic ...
|
| permanent magnets | 2/20/2006 |
Q: A magnet attracts an iron nail against gravity over a vertical distance and work is done. If this ...
A: For work to be done an external force is required to move something through a distance. In this case ...
|
| Liquid expanding when freezing | 2/19/2006 |
Q: I have always understood that things expand when heated and contract when cooled. Yet, cans of ...
A: Your general statement is, of course, true. But there are exceptions, the most important of which is ...
|
| 1.The velocity of a De Broglie... | 2/19/2006 |
Q: 1.The velocity of a De Broglie matter wave is :-equal to c,greater than c,less than c or may be less ...
A: 1. Nothing that has rest mass can travel at or above the speed of light. Therefore, the speed of the ...
|
| electricity | 2/18/2006 |
Q: please answer this question nowwwwwwwwwwwwwwwwwww THANKS FOR UR HELP,SIR ...
A: Power is equal to current times voltage. Therefore, the current required to generate the desired ...
|
| Lightning | 2/18/2006 |
Q: I want ask that how does the cloud accumulate such huge quantity electric charge. Kindly give a ...
A: As droplets of water move from location to location within a cloud the water droplets physically ...
|
| Wavelength/frequency | 2/17/2006 |
Q: I have read in a book that when light enters glass from air it slows down and its wavelength gets ...
A: Actually, it is quite easy! Since the speed of a wave is equal to the product of the wave's ...
|
| Physics: Perpetual Motion | 2/17/2006 |
Q: I that according to current laws of physics that a 100% efficient perpetual motion device is NOT ...
A: I guess it all depends on what you intend with the word "perpetual". When the statement is made that ...
|
| Physical science Heat | 2/16/2006 |
Q: I don't know if you can help me or not! I am homeschooling my daughter and i want to make sure these ...
A: 1. The change in length will be equal to the original length times the coefficient of thermal ...
|
| about electric forces and fields | 2/14/2006 |
Q: the four points charges in a rectangle are each +4.0 microC. find the magnitude and the direction of ...
A: Find the magnitude of the force of each of the other charges on q2. F12=(k*q1*q2)/(R12)^2 R12=b ...
|
| static charge transfer | 2/14/2006 |
Q: I'm a hs chemistry teacher (from Pgh originally) with a question. When silk is rubbed on a glass ...
A: First of all, I am also from Pittsburgh, born in Mckeesport and raised primarily in the South Hills ...
|
| Leverage | 2/10/2006 |
Q: We are learning about leverage. I am not sure if this is a physics question. If not, sorry. My ...
A: When you pick up the end of a board, the torque required will be equal to the product of the force ...
|
| physics | 2/9/2006 |
Q: When dropping an egg from about 8m, what are the forces acting on the egg as it falls?
A: While the egg is falling the only forces acting on the egg will be gravity and air friction. ...
|
| physics | 2/8/2006 |
Q: one kg(1000 g)of glass (glass=2.6 g/cm^3) is shaped into a hollow sphere that barely floats in ...
A: In order for the hollow glass sphere to float in water its AVERAGE density must be the same as the ...
|
| modern physics | 2/5/2006 |
Q: the atoms in a radioactive source each have a mass of 3.8x10^-25. its activity is 3.7X10^13b per ...
A: If you divide 1.0 kg by the mass of each atom [given in the problem], you can determine the number ...
|
| modern physics | 2/5/2006 |
Q: sorry its radium 224 why cant radium 224 decay by giving out either a neutron or proton but it can ...
A: Ah! The real issue here is the relative probability! In any case the most stable atom is Iron 56. ...
|
| modern physics | 2/4/2006 |
Q: the energy of the alpha particle emmitted when radon -220 decays is 8.8x10^-13J calculate the ...
A: You can first calculate the velocity of the the emitted alpha particles from KE=1/2*m*v4^2 Where KE ...
|
| Speed of sound in different gas | 2/3/2006 |
Q: from looking at the formulas on the net it appears that as tempretur increases the speed of ssound ...
A: The speed of sound does indeed increase with an increase in temperature. The speed of sound at STP ...
|
| Egg Drop Project | 2/2/2006 |
Q: What would be some good materials to use to protect a raw egg to be dropped from a height of 8ft? ...
A: How about an empty 1 quart milk carton. Within the container build a structure from glue and ...
|
| Magnetism | 2/1/2006 |
Q: Could you explain unpaired electrons? That is what would/should they be paired with normally? ...
A: Paired with other electrons. In an oversimplification assume that one electron is orbiting an atom ...
|
| hello can u help with this?
the... | 2/1/2006 |
Q: the total radiation from the sun received by earth is 1.73x10^17j/s. what is the earths diameter if ...
A: Divide the total power received from the sun 1.73x10^(17)W by the solar insolation 1377W/m^2. [Note ...
|
| physics | 1/31/2006 |
Q: Two spheres are mounted on identical horizontal springs and rest on a frictionless table, as in the ...
A: I assume from your description that this system consists of two different masses connected together ...
|
| physics | 1/30/2006 |
Q: A vertical wall (6.6 m 2.1 m) in a house faces due east. A uniform electric field has a magnitude ...
A: Electric flux is equal to the product of the area and the perpendicular component of the electric ...
|
| Science, Medicine and Technology | 1/29/2006 |
Q: What is the relevance of Science, Medicine and Technology to the development of the American ...
A: I think that it would be fair to say that we would be living in a very different society in the ...
|
| Fire | 1/28/2006 |
Q: What comes first the fire or the smoke I really need to know what are the components to result in a ...
A: Interestingly, you can have both: fire without smoke or smoke without fire! It is, therefore, ...
|
| Electric Current and Ohm's law | 1/27/2006 |
Q: PLEASE ANSWER THIS QUESTION 4 ME AS FAST AS U CAN ------------------------------------------------- ...
A: Given the initial conditions P1=I1^2*R1 Given the final conditions P2=I2^2*R2 Replacing with ...
|
| Light Speed | 1/26/2006 |
Q: It is obvious that photons have no rest mass but I don't that is the answer! I still need an answer ...
A: Not as you would assume! As the velocity of a mass approaches the speed of light, more and more of ...
|
| Physical Science | 1/25/2006 |
Q: A CAR STARTS FROM REST WITH A CONSTANT ACCELERATION OF 2 M/S2. IN THE FIRST 4 S THE CAR TRAVELS?
A: All problems of this type can be solved in the same way. There are six possible kinematics ...
|
| magnatic isolation | 1/23/2006 |
Q: I DON'T WANT TO DEFLECT MAGNATIC FIELDS.I WANT A MATTER THAT MAGNATIC FIELD DON'T GET THROUGH ...
A: As I said in my first response, the ONLY material that I know of that will accomplish the task you ...
|
| question about atoms and molecules | 1/21/2006 |
Q: We have been learning about atoms and molecules in our school. 7th grade. I asked the teacher how do ...
A: The force between atoms and molecules is caused by the electrostatic force. This force is caused by ...
|
| Motion | 1/21/2006 |
Q: You're in the back of a stationary car with a helium balloon. When the car accelerates, which way ...
A: Not that hard really! When you step on the gas of the car the heavier air in the car follows ...
|
| magnatic isolation | 1/18/2006 |
Q: i want to put a matter between two magnetes to make them (dont attrack or disattrack). i want that ...
A: I am not exactly sure what you are asking here. Are you trying to create a space where there will be ...
|
| Rectangular Helmholtz coil | 1/17/2006 |
Q: Is it possible to build a rectangular (instead of circular) Helmholtz coil? if "yes" do you know if ...
A: If it was square it would not be a Helmholtx Coil! What is special about the Helmholtz coil is that ...
|
| Electricity | 1/15/2006 |
Q: Why is it that by increasing the voltage in a wire the current decreases. i.e used for less heating ...
A: But that is NOT true! If you increase the voltage across a wire the current through that wire will ...
|
| projectiles launched at an angle | 1/13/2006 |
Q: A cannon elevated at an angle of 35' to the horizontal fires a cannonball, which travels the path ...
A: According to kinematics the final velocity of a freefalling object can be predicted from vf=a*t+vo. ...
|
| Statistical behaviour by atoms | 1/13/2006 |
Q: In order to perform thought the brain must be a very well ordered organization. Events that happen ...
A: This seems to be more an opinion item than a knowledge item. In any case I suspect that although a ...
|
| Efficiency: simple machines | 1/11/2006 |
Q: What happens to the efficiency, as the inclined plane is made steeper? Explain why this happens. ...
A: As you increase the angle of the incline you decrease the normal force because the normal force an ...
|
| General - motion/acceleration | 1/9/2006 |
Q: I understand that when you are on a moving object, such as a train, you are going at the speed of ...
A: Definitely! The fly, as well as the air in the train car, are moving alng at the same velocity as ...
|
| Magnetism | 1/9/2006 |
Q: ------------------------- Thankyou for your reply. Can you tell me what it is about iron that makes ...
A: Since iron [as well as nickel, cobalt and gadolinium] have a relatively large number of unpaired ...
|
| the physics of fried foods | 1/7/2006 |
Q: My teacher has picked our class to study the science of fried foods through the disciplines of ...
A: The boiling point of water is 212oF [100oC] while the typical temperature of the oil used in frying ...
|
| Temperature | 1/7/2006 |
Q: I understand that absolute temperature is the measure of the degree of movement/vibration of ...
A: First of all, absolute zero is that point where the linear kinetic energy of the atoms/molecules is ...
|
| far field diffraction pattern | 1/5/2006 |
Q: How far field diffraction pattern help us to define optical element's design and performance?
A: As light passes through optical elements these elements can cause the light to diffract around flaws ...
|
| exponential decay | 1/4/2006 |
Q: Could you help me to solve this problem? This method is used to measure kinetic constant from an ...
A: Any problem with this solution [A=Ao*e^(-k*t)] will come from a system where the rate of change in a ...
|
| centripetal acceleration | 12/30/2005 |
Q: I hope I'm finding you in the best of health. Why when something is going around in a circle, does ...
A: The mass of the object moving in a circular path will affect the force required to keep the object ...
|
| Can superconductors work in space? | 12/30/2005 |
Q: We know that current high temperature superconductors work at zero resistance when they are at ...
A: First of all, it is a misconception that outer space is very cold! Temperature is a reflection of ...
|
| Buoyancy and Weight Loss | 12/29/2005 |
Q: After reviewing this after some time... I was told that the buoyancy force does not depend on depth ...
A: I think the issue here is the difference between what is real and what is ideal! In an ideal sense ...
|
| Physics: Refraction and relection of light | 12/28/2005 |
Q: Here.. Can I consider the interference of light ray at the edge of the glass same as when it strikes ...
A: Interference has nothing to do with it! This is a matter of refraction and critical angle. Some of ...
|
| Plasma Balls | 12/27/2005 |
Q: How do plasma balls work? You know, those globes filled with electricity/lightning that zap at your ...
A: You're making it tough on me! A plasma globe is filled with a low pressure gas that is selected for ...
|
| Physics: Refraction and relection of light | 12/27/2005 |
Q: Can you explain me how the ray of light will reflect and refract if it goes from air to a ...
A: I think that the point here has to do with the "critical angle". When a wave, such as light, ...
|
| (1) A fixed mass of liquid... | 12/26/2005 |
Q: (1) A fixed mass of liquid water is colled slowly from 10 C to 0 C. (A) Describe the arrangement and ...
A: 1A. As the water moves from 10-0oC the entropy of the system decreases. In other words, the ...
|
| (1)(a) What is the size of... | 12/26/2005 |
Q: (1)(a) What is the size of the diameter of an air molecule? (b) Some air at pressure of 100000 Pa ...
A: 1a. I can't really answer that because air is made up of more than one type of molecule. However, ...
|
| How do I measure the resistance... | 12/25/2005 |
Q: How do I measure the resistance of a thermistor which varies in range from 0-100 C. Describe in ...
A: voltmeter, ammeter, clip leads, thermometer, beaker, water, hot plate, thermister 1. Using a ...
|
| Energy transfers, forces, | 12/25/2005 |
Q: (A)A skier of mass 65 kg travels down the 1740 m length of the slope, falling through a verticle ...
A: A 1. Gravitational potential energy is given by m*g*Dh where Dh is the change in height, g is the ...
|
| electric current | 12/24/2005 |
Q: I cannot understand how does current actually flow in a circuit? Is there actually a flow of ...
A: What happens in an electric circuit is that the weakly bound electrons in a metal are "pushed" ...
|
| Length contraction | 12/24/2005 |
Q: What do you mean by a contraction of the electric field around a fast moving charged particle? How ...
A: Who says space is meaningless without the presence of matter? Many physicists would STRONGLY ...
|
| ELEDs & SLEDs | 12/23/2005 |
Q: SIr I wana ask What is the Difference between a surface – emitting LED & (SLED) & edge-emitting ...
A: I do not know the difference between these two types of diode. But as to the secondSpontaneous ...
|
| Weight difference | 12/23/2005 |
Q: 10 k.g iron ball having length of 50 cm, which is used to make a cube having 100 cm in length. What ...
A: I'm not exactly sure what you are asking, but it is my impression that you are asking if change the ...
|
| Length contraction | 12/22/2005 |
Q: If an object is travelling at a speed near that of light, we would see the length of the object as ...
A: Although we may have difficulty noticing a decrease in the diameter of a tiny particle like the ...
|
| Centrifugal force or not | 12/20/2005 |
Q: James. I understand that centrifugal forces do not exist or if they do then they are very ...
A: There is no opposite force pulling outward! What you are interpreting as an outward force is the ...
|
| heat | 12/19/2005 |
Q: how do electromagnetic waves, including visible light, carry heat energy? such as in a campfire.
A: They don't! Electromagnetic waves carry energy in the form of oscillating electric and magnetic ...
|
| Polarisation | 12/18/2005 |
Q: Why is it that a tv aerial has to be pointing in the direction of polarisation of the ...
A: The typical TV antenna is a "dipole" antenna. This means that the antenna is designed so that when ...
|
| Gravity | 12/18/2005 |
Q: i have a series of doubts regarding gravity. Can you please clarify them? if not all, atleast some. ...
A: 1. Two atoms "touching" do not have more gravitational force that two atoms that are separate. In ...
|
| projectiles thrown horizontally | 12/17/2005 |
Q: I hope I'm finding you in the best of health. By projectiles, when throwing something ...
A: When we throw someting horizontally we arre talking about the object immediately AFTER it has been ...
|
| EM potentials in space | 12/17/2005 |
Q: Mr. Kovalcin, I am confused as to why American physicists maintain the belief that electromagnetic ...
A: I have no idea what you mean by "material space"! For the most part outer space has very little ...
|
| G Force on an object in free fall. | 12/14/2005 |
Q: I came a cross this statement but not sure how the this adds up, "During free fall with a mass of 13 ...
A: For simplicity, suppose that you drop a steel ball, which has a diameter of 10 cm and a mass of 1.0 ...
|
| Airplane on moving runway | 12/13/2005 |
Q: --- A plane is standing on runway that can move (some sort of band conveyer). The plane moves in one ...
A: First of all, the statement "is driven by a propeller or jet engine pushing against the air" is NOT ...
|
| Magnetism | 12/10/2005 |
Q: What can cause an ordinary magnet to reverse polarity?
A: Many things can accomplish this task. What I do in my classroom is to take a bar magnet, stick it ...
|
| equilibrium | 12/9/2005 |
Q: I have an equilibrium question I'm hoping you can help me with: Three forces act concurrently on an ...
A: Since this system is at equilibrium, the sum of these three forces must be equal to zero. In order ...
|
| Color and Relation With Temperature | 12/8/2005 |
Q: my name is Sebastian Silva and I am doing a science fair project on the problemDoes the color of ...
A: 1. A darker color will absorb more heat. 2. Once the heat is absorbed by the surface water it will ...
|
| egg drop lab | 12/8/2005 |
Q: i have to do a physics lab where you drop the egg and it can't crack. how can i (using 5 pieces of ...
A: Your goal will be to build a structure around the egge that will undergo "controlled collapse". What ...
|
| Projectile Motion | 12/7/2005 |
Q: When doing calculations on projectile motion acceleration due to gravity is 9.8ms^-2 Just to check ...
A: The acceleration of gravity is a vector quantity. Any time that we are doing a calculation where the ...
|
| Losing Radio Signal | 12/5/2005 |
Q: I have a 2002 Mitsubishi Eclipse with the Infinity Sound System. About 2 weeks ago I started losing ...
A: Assuming that the radio antenna is in good physical shape, I would check the condition of the ...
|
| energy | 12/4/2005 |
Q: A 6.0 kg block is pushed 9.0 m up a rough 35° inclined plane by a horizontal force of 85 N. If the ...
A: c) The work done by the frictional force will just be equal to the product of the frictional force ...
|
| The cause of damage in a collision | 12/3/2005 |
Q: If you put two eggs in a shoe box and drop the box from a height of 30 feet onto a concrete floor, ...
A: Actually, neither! The eggs break because they contain kinetic energy. In order for the eggs to come ...
|
| science fair project | 12/2/2005 |
Q: ok look , i need to do a science fair project and i dont have any idea of what i wanna do it about . ...
A: Suggestions! 1. Build a "Rube Goldberg" machine that demonstates as many physics principles as ...
|
| force | 11/30/2005 |
Q: which force is strongest of following magnetic, electric, nuclear or gravitational force?
A: No competition here at all! The nuclear force is dramatically stronger than the other fundamental ...
|
| particle | 11/29/2005 |
Q: i have purchased a book to develop myself. My mathematical skills are pretty ok. I am ok till ...
A: I don't think that treating the motorcycle as a point would be entirely appropriate because of ...
|
| coefficient of friction formulas | 11/27/2005 |
Q: I hope I'm finding you in the best of health. A 60kg boy is on a 15kg sled. He is pushed along a ...
A: Your problem solving approach is correct. What is confusing you is that in the teacher's example you ...
|
| magnetism | 11/26/2005 |
Q: What would be a good,detailed science experiment that involves magnetism?
A: There are many possibilities! 1. Measure the magnetic field strengh of a magnetic filed using a Hall ...
|
| physices | 11/26/2005 |
Q: how we can make learning of physices more exciting? 2-how we can make(relative theory)more easy for ...
A: I can't understand how you can ask such a question! The very nature of physics is exciting! The act ...
|
| Manometer | 11/25/2005 |
Q: I'm not sure if I'm asking the right person, but I really need some help on this!? I'm having ...
A: To get a sensitivity of 2 you need for the diagonal length of the manometer to be twice the vertical ...
|
| Van de Graaf | 11/23/2005 |
Q: 2 questions about the operation of a van de graaf generator: 1) why should you never operate a ...
A: Grounding the Van de Graff supplies the sphere with charge and thus generates a real electrostatic ...
|
| pd and emf | 11/23/2005 |
Q: Could you please explain what is the difference between a potential difference and an emf of a ...
A: Let me try to explain it this way! 1. Consider a 1.0 kg mass sitting on the floor. This mass has a ...
|
| Smoke | 11/19/2005 |
Q: If the hot combustion product rises, this means it has counteract gravity. So, whether gravity is ...
A: The hot combustion gases rise because they are lighter than the surrounding air. The surrounding ...
|
| Smoke | 11/18/2005 |
Q: How low do we have to crawl during a fire breakout? Why does fire smoke rise?
A: How low you have to crawl will depend on the nature of the fire! There may be times when there isn's ...
|
| newton's laws of motion-inclination | 11/17/2005 |
Q: 1) a wet bar of soap (mass=150 grams) slides freely down a ramp 2.0 m long inclined at 7.3 degrees. ...
A: Step one! Make an appropriate free body diagram indicating all of the relevant forces. In this case ...
|
| metric system SI physic tool | 11/17/2005 |
Q: Explain what the metric system is and how it applies to the universal language of measurement.
A: Until the metric system was developed in France in the early 17th century, measurement systems ...
|
| weight | 11/16/2005 |
Q: If you had birds in a box would the box weigh less if some of the birds were flying? If yes, why ...
A: Assuming that the box is sealed, it would make no difference at all. As the bird flies the bird's ...
|
| Newton Scooters | 11/14/2005 |
Q: My daughter built a car that is supposed to move 1 1/2 meters. We attached a rubber band to the ...
A: You need to increase the friction between the wheels of the cart and the floor. Try wrapping a large ...
|
| shock absorber for an egg being dropped | 11/14/2005 |
Q: What is a good shock absorber to catch an egg coming down from 5 meters. It must also be less than 5 ...
A: The idea is to surround the ege with a structure that will break when it contacts the ground thus ...
|
| newton's laws of motion | 11/13/2005 |
Q: 1) a 0.145-kg baseball traveling 30.0 m/s strikes the catcher's mitt, which, in bringing the ball to ...
A: To solve each of these problems it is easiest to use the "impulse" form of Newton's 2nd Law. ...
|
| forces | 11/13/2005 |
Q: I hope I'm finding you in the best of health. A horizontal force is used to pull a 5.0-kilogram cart ...
A: Since the cart is being pulled along the floor at a constant speed, the cart is at equilibrium. If ...
|
| newton's laws of motion | 11/11/2005 |
Q: 1) what average force is required to stop a 1200-kg car in 7.0 s if it is traveling at 90 km/h? 2) ...
A: Both of these problems require the use of a form on Newton's 2nd Law known as the impulse equation. ...
|
| Thermal Properties | 11/10/2005 |
Q: A group of students drove near sea level up into the mountains. They discovered that the bags of ...
A: ALl of us are sitting at the bottom of an "ocean" of atmosphere. If we could condense all of the ...
|
| Help PLEASE! | 11/9/2005 |
Q: Im sure you have heard alot about the egg drop expermint! I just have to come up with and egg drop ...
A: The fundamental idea is to surround the egg with a structure the dissipates the kinetic energy of ...
|
| Xmas Lights internal shunt | 11/9/2005 |
Q: "The 100 ohm resistor you refer to is MUCH lower than the resistance of the coils. As a result, in ...
A: Sorry! The 100 ohm resistor is much HIGHER than the typical resistance of the coil! When the current ...
|
| electric field inside a conductor | 11/8/2005 |
Q: I have a conceptual question for you. Say we have wire conducting a current. For an ideal conductor, ...
A: The answer is that the electric field within the conductor is NOT zero! You are confusing the idea ...
|
| Xmas Lights internal shunt | 11/7/2005 |
Q: http://electronics.howstuffworks.com/christmas-lights2.htm explains how an internal shunt in a set ...
A: The lights you refer to are NOT wired in parallel, but are in series. That is why the burnout shunt ...
|
| Solenoid | 11/7/2005 |
Q: Greetings. i was wondering if you will be so kind as to help with this question. It is racking my ...
A: The torque on a coil sitting in a uniform magnetic field is given by T=N*I1*AxB where N is the ...
|
| Physics Project | 11/6/2005 |
Q: can you please suggest me some physics projects (about 3-4) if possible about interference/Young's ...
A: Possibilities! 1. Develop a techinique to measure the distance between the grooves in LP's, CD's, ...
|
| negative accleration greater than zero acceleration? | 10/31/2005 |
Q: Object "A" has a zero velocity. Object "B" has a negative. Which velocity is greater? It has been ...
A: In general a negative acceleration will be considered to be less than a positive or zero ...
|
| Capacitor/Inductor | 10/30/2005 |
Q: With a capacitor on AC voltage lags current by 90 degrees and with an inductor current lags voltage ...
A: The phase angle depends on the total impedance of the circuit. cos(phase angle) = ...
|
| boiling point of liquids and bubble formation | 10/29/2005 |
Q: In chemistry we are told bubbles will only begin to form when the saturated vapor pressure = ...
A: I would agree with you. The minimum temperture at which the liquid will boil occurs when the stated ...
|
| rotational equilibrium | 10/28/2005 |
Q: Suppose a 34kg child sits .95m to the left of center on a seesaw of length, L= 3.74m, pivoted in the ...
A: When a system like a see-saw is at equilibrium, opposite torques will be equal. Since torque is ...
|
| kinematics | 10/27/2005 |
Q: , I just started physics a month ago and the following observation has been bothering me for a ...
A: If th acceleration is constant that means that the rate of change of velocity is a constant. If you ...
|
| Temperature | 10/26/2005 |
Q: I want a final temperature of a litter of kool-aid to be 15 degrees. The water coming out of my tap ...
A: The heat gained or lost by a substanc is given by Q=m*c*DT where Q is heat, m is the mass of the ...
|
| rotational problem | 10/25/2005 |
Q: I've been trying to do this problem for a while now. I know it probably has something to do with ...
A: As you have surmised this is an angular momentum problem. The initial angular momentum of the system ...
|
| angular and moment of inertia | 10/25/2005 |
Q: hey, i have been trying this problem for a while but i just can't start it. i am pretty sure it has ...
A: As you have surmised this is an angular momentum problem. The initial angular momentum of the system ...
|
| help please | 10/24/2005 |
Q: I just had a few questions and I really need help. please. 1.) An SUV and a Honda Civic are racing ...
A: 1. Since kinetic energy is KE=1/2*m*v^2 the car with the greater mass will have the greater KE given ...
|
| A high voltage power line... | 10/24/2005 |
Q: A high voltage power line carries a current of 110A at a location where Earth's magnetic field had ...
A: The magnetic force on a current carrying wire placed in a uniform magnetic field is given by ...
|
| electric potential energy | 10/22/2005 |
Q: I need a definition for this term, and don't have a textbook here.
A: When you do work on a charged particle so as to move that charged particle aqainst the electric ...
|
| science fair project interview | 10/22/2005 |
Q: I am in 7th grade and need to interview someone related to my project(by email is ok). I would ...
A: If you heat a magnet up until it reachers what is called the "Curie Point", the magnet will lose all ...
|
| Key Differences in Physis | 10/20/2005 |
Q: I was wondering what are the Key differences between: Momentum\Velocity, Net Force, and Accereation? ...
A: What are you trying to get at? Velocity - Defined to be the change in position divided by the change ...
|
| Thermal Physics | 10/18/2005 |
Q: We're having an argument in the office. Two items are removed from a refrigerator a piece of ...
A: It would be close, but the chicken would probably cook more quickly [assuming that the mass of the ...
|
| soil or water when sunlight hits it? | 10/17/2005 |
Q: why does Soil heat up much faster than water when the two are exposed to sunlight. Use that fact and ...
A: Generally soil contains much less water than seawater! Since the specific heat of water is much ...
|
| Absorbancy | 10/15/2005 |
Q: I'm doing a science project on absorbancy. I am seeing how much water a mpo will hold before it ...
A: This may not really answer your question, but you might find it an interesting application. Check ...
|
| Travel faster tha light | 10/14/2005 |
Q: It is well known that nothing could travel faster than light (C) and also that motion is relative. ...
A: What you say is absolutely true, but it is NOT a violation of this postulate of the Special Theory ...
|
| refraction | 10/13/2005 |
Q: A ray of light is incident at an angle of 60 degrees on the surface of a glass plate 40mm thick and ...
A: Somewhat difficult to explain without a diagram, but here goes. 1. Calculate the angle of the light ...
|
| Electricity working in the household | 10/13/2005 |
Q: We just began the topic of electricity in my Australian 11th Grade physics class. I have some ...
A: Your home is wired in parallel. This means that each branch can operate separately. Each branch ...
|
| Vector Diagrams and perpendicular force | 10/12/2005 |
Q: This is a bit hard for me to explain but: If a ball is rolled up/down a hill which is at 'theta' ...
A: Ordinariy, the reason we care about the normal force is because the frictional force acting on a ...
|
| The Graviton | 10/11/2005 |
Q: If I were looking for a graviton, why would I not simply look into the center of each and every ...
A: There are severl problems here! First of all, the grvitational force is approximately 20 orders of ...
|
| kinematics in 2-d or 3-d motions: vectors | 10/9/2005 |
Q: 1) a rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 200 m below. ...
A: Do is the initial location of the object Df is the final location of the object Vo is the initial ...
|
| kinematics in 2-d or 3-d motions: vectors | 10/8/2005 |
Q: 1) a rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 200 m below. ...
A: All problems of this type are solved in the exact same way. Set up two data tables: one for the ...
|
| kinematics in 2-d or 3-d motion: vectors | 10/8/2005 |
Q: 1) a ball is thrown horizontally from the roof of a building 50 m tall and lands 45 m from the base. ...
A: All problems of this type are solved in the exact same way. Set up two data tables: one for the ...
|
| kinematics in 2-d or 3-d dimensions-vectors | 10/7/2005 |
Q: 1) a fire hose held near the ground shoots water at a speed of 7.5 m/s. At what angle(s) should the ...
A: The range of such a "projectile" can be calculated by multiplying the horizontal component of the ...
|
| Physics: Heat Querie | 10/7/2005 |
Q: I just started my first year in Physics and im puzzled by thisSuppose you are in the mountains at a ...
A: Actually you got it quite reversed. As you move higher in the atmosphere the density of the air ...
|
| question | 10/6/2005 |
Q: My question isn't under your speciality, so if you don't want to answer feel free not to. I'd like ...
A: People may say this, but it just isn't true! Death occurs when contact with the ground is made! At ...
|
| Velocity | 10/2/2005 |
Q: I have a question that I am not sure about my answer. The question is seeking an answer for ...
A: This is a really tough one and although I have an answer for you I do not really know how to do the ...
|
| physics | 10/2/2005 |
Q: Does sound travel best through solid, liquid, or gas?
A: It depends on what you mean by "best"! If you mean fastest, the answer would be solid, then liquid ...
|
| egg drop contest | 10/1/2005 |
Q: I have to make an egg drop that can survive a 30 foot fall. the only materials i can use are manila ...
A: The idea is to build a structure around the egg that breks and tears when the egg collides with the ...
|
| Pressure and state | 10/1/2005 |
Q: IF you cool a gas below its boiling point it will condense into a liquid. But is it possible to put ...
A: I can't say that it is true for all substances, but it is true that increasing pressure affects the ...
|
| elasticity | 9/30/2005 |
Q: i ve been trying this problem for a while now. it sounds simple but i never get the right answer. ...
A: This problem can be solved by using the "impulse" form of Newton's 2nd Law, F=m*a becomes F=m*Dv/Dt ...
|
| Coulomb's law And Gauss's law | 9/30/2005 |
Q: You have a long conductor carrying a charge say "q"per unit length.Determine electric intensity at a ...
A: Using Coulomb's Law! The charge per unit length will be lambda=charge/length. Each piece of the ...
|
| force on chain | 9/29/2005 |
Q: A flexible chain of length 1 m, and mass 2 kg is held from one end so that it hangs vertically, the ...
A: The problem is that you are only considering the weight of the chain. The table also has to exert an ...
|
| physics behind an object dropping | 9/29/2005 |
Q: Please mr.Kovalcin help me I am an A+ student and this project has me stumped. We have to drop and ...
A: When any object is lifted to a high point you must do work on the object. That object then contains ...
|
| physics | 9/28/2005 |
Q: A ball is thrown upward from the top of a 26.6 m tall building. The ball's initial speed is 12 m/s. ...
A: Set up a data table describing the kinematics of this ball: Do=26.6m, Df=0m, Vo=12m/s, Vf=?, ...
|
| physics | 9/28/2005 |
Q: A sky diver, with parachute unopened, falls 625 m in 15.0 s. Then she opens her parachute and falls ...
A: Average velocity is equal to the change in position divided by the time required to achieve the ...
|
| egg drop | 9/27/2005 |
Q: I am required to build an egg drop in my ap physics class. I have to keep an egg from cracking ...
A: The here is to surround the egg with a structure that "breaks" when the egg strikes the ground, but ...
|
| Newton Cradle | 9/24/2005 |
|
