| Subject | Date Asked |
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| inclined frictionless plane minimizing travel time | 11/19/2009 |
Q: Rock sliding down a frictionless ramp of height H, and distance from the base x, initial velocity vo ...
A: I have some problems understanding your question. I used my best guess and rewrote the problem. This ...
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| centre of mass | 11/18/2009 |
Q: I read in a book that if the barrel of a gun is inclined at an angle of 45 degree with horizontal ...
A: That would be a strange outcome if the bullet doesn't emerge on the path it was on when it was in ...
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| Uniform Circular Motion | 11/17/2009 |
Q: a 600kg racing car travels at a constant speed around a circular track with a radius of 50.0m and ...
A: In order for the car to follow the circular track, it needs to have centripetal (meaning pointed ...
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| floatation | 11/16/2009 |
Q: can you verify the third case in principal of floatation in which body floats above the surface of ...
A: Yes, that is true. Here's a way to think about it that might help it make sense. Imagine that you're ...
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| computational fluid dynamics | 11/15/2009 |
Q: what are mathemtical concepts for this subject .learning matlab is sufficient or compulsory c++,c ...
A: This topic is beyond my expertise. However I'm pretty good at searching the web. Check these sites. ...
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| could you please help me! | 11/13/2009 |
Q: 1. When an athlete is preparing to throw a shot put ball, does the ball exert a force on the ...
A: 1. Yes it does. While preparing to put, and while putting too. Consider a book sitting on a scale. ...
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| quantum | 11/12/2009 |
Q: I know under the rules of the quantum, when we observe a particle we change it. But, how do we know ...
A: Your brief statement of "the rules of the quantum" is a oversimplification. As I said in my profile, ...
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| capacitor | 11/10/2009 |
Q: i am studying electronic engineering but this is my first year and i have a question about capacitor ...
A: I was picturing a big enough swing that the dielectric was passing through and out the other side. I ...
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| Physics | 11/9/2009 |
Q: A 2.96 kg particle has a velocity of (2.94i - 4.02j ) m/s. (a) Find its x and y components of ...
A: Bell, a) The x component of its momentum = m*Vx = 2.96 kg*2.94 m/s The y component of its momentum ...
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| kinimatics | 11/8/2009 |
Q: A) If the coefficient of friction between a 35-kg crate and the floor is .30, what horizontal force ...
A: If the speed is to be steady, the acceleration must be zero. Therefore the net force must be zero ...
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| capacitor | 11/6/2009 |
Q: i am studying electronic engineering but this is my first year and i have a question about capacitor ...
A: Perhaps I'm not interpreting it the way you mean. If I've got the wrong picture, please send a ...
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| What is the driving force for electron to flow | 11/5/2009 |
Q: We have read that electron flows by the electro-motive force (emf) through conductor. We also know ...
A: 1) The units of emf is the volt, which is equivalent to Joule/coulomb. Emf is closely related to ...
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| Physics | 11/3/2009 |
Q: A block of low density plastic foam and a block of lead each of mass 0.2kg are released together and ...
A: Without more data, you can't get a numerical answer for either question. i) Ignoring air drag, the ...
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| Modern physics | 11/2/2009 |
Q: Suppose that the average power consumption, day and night of an average house is 2800W. What mass of ...
A: Fission: At a rate of 2800 W, the energy consumed per year would be 2.800 kW * 365 days * 24 hr/day ...
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| physics | 11/1/2009 |
Q: 1.how the displacement of averticaly thrown ball varies with time? 2.how the velocity of verticaly ...
A: 1. The displacement is given by the kinematic formula y = Vo*t + (1/2)*a*t^2 where Vo is the ...
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| emf induced in 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: What you have is an RL circuit. If the light stays lit after the battery is disconnected, it's ...
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| Thermodynamic arrow of time | 10/30/2009 |
Q: As time passes, physicists say the energy in the universe becomes unusable or disorganized. This ...
A: The Second Law of Thermodynamics is based on randomness. Application of the law is valid when taking ...
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| mechanics | 10/29/2009 |
Q: i cant get this problem : a short hollow steel tube (Length 30") is filled with concrete. the ...
A: The steel tube and the concrete will share the reaction to the axial force. As they do this, they ...
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| resultant reactions | 10/23/2009 |
Q: two man applying forces in different direction on a stone of mass 30kg and five healthy man applying ...
A: Your questions deal with Newton's 3rd Law. The 2 man case: The reaction force can be thought of 2 ...
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| Coil Voltage/Amperage | 10/22/2009 |
Q: I have been looking all over the Internet and cant find an answer to what I'm wondering. I know ...
A: The induced emf will be equal to the negative rate at which the magnetic flux through the loop is ...
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| physics | 10/20/2009 |
Q: Question 1: A 3.0-g bullet traveling at 350 m/s hits a tree and slows down uniformly to a stop while ...
A: Question 1: You could do this 2 ways: * The bullet decelerated from 350 m/s to 0 m/s while going ...
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| Physics motion | 10/19/2009 |
Q: A pitched ball is hit by a batter at a 40° angle and just clears the outfield fence, 99 m away. If ...
A: I assume the 40 degrees is measured between horizontal and the original flight direction. The ball's ...
|
| Impact Pressure of air | 10/16/2009 |
Q: How many PSI of pressure does an RV with a front wall measurement of 8' tall and 8' wide experience ...
A: An expert in Civil Engineering may be more familiar with the analysis of this. I did some study and ...
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| Physics Questions | 10/14/2009 |
Q: "This isn't an assignment. It was a project. My teacher said we can find answers using the net. 1. ...
A: 1. Bedsores develop as a function of the pressure the person is given by the mattress. A waterbed ...
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| Physics Vector problem please help | 10/8/2009 |
Q: A hunter wishes to cross a river that is 1.8km wide and that flows with a speed of 3 km/h. The ...
A: The hunter will have to point the boat upriver in order to achieve crossing directly across the ...
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| atomic physics | 10/7/2009 |
Q: when cathode rays strike with particularly anode then why X-rays produce and only X-rays can ...
A: As my profile says, atomic physics is not my area of expertise. However I have found some websites ...
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| motion | 10/6/2009 |
Q: A heavy iron bar of weight W is having its one end on the ground and other on the shoulder of a ...
A: The bar is in equilibrium, so the sum of the upward forces delivered by the ground and the man must ...
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| physics | 10/4/2009 |
Q: if the first condition of equilibrium is satisfied on a moving body but the sum of external torque ...
A: The 2nd condition of equilibrium is that the body's angular acceleration is zero. If the sum of ...
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| Frequency x ? | 10/3/2009 |
Q: Frequency x ? I am so excited about this question, For the sake of the question let's ...
A: Originally A*Z = c. So you can also say that Z = c/A The "Orbit Time of the Particle" is equal to ...
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| Physics | 10/2/2009 |
Q: Johnson, I have been working on this question for a while now and haven't been able to figure out, ...
A: a) The vertical component of the bike's initial 33.5 m/s is Vvi = 33.5 m/s*sin18 = 10.3 m/s So the ...
|
| Could you please help me?I'm struggling,just want to learn from someones explanation | 10/1/2009 |
Q: 4.)) Aisha and bert are running at constants speeds, Aisha at 9.0 m/s and Bert at 8.5 m/s. They ...
A: These problems require that you have a good understanding of the units that speed is measured in. It ...
|
| pulleys | 9/21/2009 |
Q: I have two shafts.Shaft A is turning 540 rpm it has a 30 inch diameter pulley.What size pulley do I ...
A: This is easy to understand once you see the benefit of considering the motion of the belt. Consider ...
|
| Gravitational field | 9/20/2009 |
Q: Do you know any websites that have computer simulations that presentation of theoretical predictions ...
A: I know this took too many days. My Java didn't work and fixing it was a major task. I found several ...
|
| Interference | 9/19/2009 |
Q: a plate of thickness t made of a material of refractive index u is placed in front of one of the ...
A: Perhaps it is due to the lack of a sketch, but as understand the situation, I agree with you. With ...
|
| physics | 9/18/2009 |
Q: A superhero flies 307m from the top of a tall building at an angle of 26 degrees below the ...
A: This is an exercise in trigonometry. Draw it, just approximate the distances you don't know yet. I ...
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| physics question | 9/17/2009 |
Q: I am having trouble with a physics problem, and I can't find a similar one to model when finding the ...
A: a) This takes advantage of the concept that you can separate vertical motion from horizontal motion ...
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| Physics: Equilibrium Problem | 9/16/2009 |
Q: There are two charges with masses of 10 grams each. They are suspended by strings of 1 meter long. ...
A: I assume the strings are tied off at the same hook and the angle is 4 degrees from one string to the ...
|
| physics | 9/15/2009 |
Q: A parallel plate capacitor has a capacitance of 6.3 µF when filled with a dielectric. The area of ...
A: For the case of a parallel plate capacitor with no dielectric, is described by the relationship C = ...
|
| physics | 9/14/2009 |
Q: A small sphere is kept on a concave glass of radius of curvature R placed on a horizontal table . ...
A: For simple harmonic motion to be displayed, there must be a restoring force (which tends to return ...
|
| Ohm's law | 9/13/2009 |
Q: I'm recently doing a lab report on Ohm's law. I wonder what are the sources or error and ...
A: Discussion of error sources you want to recognize and minimize: * The deviation from perfect ...
|
| Oscillation | 9/12/2009 |
Q: Describe practical examples of forced oscillations. Thank you
A: Forced oscillations can be considered to include the process of pushing someone on a playground ...
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| physics | 9/11/2009 |
Q: Identical +6.91 µC charges are fixed to adjacent corners of a square. What charge (magnitude and ...
A: Identical: The potential at any point would be equal to the sum of potentials at that point due to ...
|
| physics | 9/10/2009 |
Q: what is the extended and regular body of a center of mass? what is the extended and regular body of ...
A: The way your questions are worded, I'm not sure what you mean. I will assume this is what you meant ...
|
| Mechanics- Forces | 9/9/2009 |
Q: Could you please help me. How do i find the height an object has fallen from if i am only given the ...
A: If the object was dropped from height h, the acceleration it experiences is due to gravity. Normally ...
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| physics | 9/8/2009 |
Q: Could you help me give a mathematical explanation on Projectile motion?
A: In most of these problems, the projectile is launched with an original velocity that points ...
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| Superposition | 9/3/2009 |
Q: Describe experiments which demonstrate stationary waves for microwaves & stretched strings. If ...
A: Stretched strings: The Wikipedia site discusses stationary waves. Expand the 2nd figure in the group ...
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| mechanics | 9/1/2009 |
Q: SIR, A BLOCK IS ATTACHED TO TWO STRINGS WITH THE HELP OF PULLEY AS SHOWN IN THE FIGURE.THE TWO ENDS ...
A: My first quick attempt at this gave me the result V*cos(theta). But that doesn't pass the test of a ...
|
| color | 8/31/2009 |
Q: what colors of ink do color ink jet printers use to produce a full range fo colors? do the colors ...
A: The colors are cyan, magenta, yellow and black, commonly abbreviated CMYK. The ink absorbs ...
|
| mechanics | 8/30/2009 |
Q: I'm trying to convert units of torque. I have a mini dc motor that says it produces 5.3 g/cm how ...
A: First I need to correct the units. The units of torque is force times distance -- example ft*lbs. ...
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| Physics | 8/29/2009 |
Q: A satellite is lunched in a direction parallel to the surface of the earth with a velocity of ...
A: Check out the figure in the section titled "Understanding orbits" in the following site. ...
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| PHYSICS- Laws of Motion | 8/28/2009 |
Q: 1. A 910kg car is speeding at 97km/hr on a level road. Determine the horizontal breaking force ...
A: It appears that you beginning study of physics. So I inserted an explanation you might need to my ...
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| Vectors | 8/26/2009 |
Q: Could you please tell me- if two vectors have the same coefficient but different units, then do they ...
A: Vectors have both magnitude and direction. Magnitude includes the units. Therefore 4 meters and 4 ...
|
| Expeiment for project | 8/25/2009 |
Q: i have a project in school. in that i have to make soe grphs and do some calculations for the expt ...
A: To do this project, you need to understand the main difference in the characteristics of the 2 ...
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| radiation | 8/24/2009 |
Q: we are a group of teachers . we would like to ask you this question in wars some countries used new ...
A: If by "new", you mean developed in the last 30 years, I don't know of the weapons you refer to. And ...
|
| Power/Velocity relationship and reference frames | 8/23/2009 |
Q: I'm having some difficulty accepting the basic relationship between power and force, given as power ...
A: The basic definition for power is that it is the rate at which work is done: P = W/t Note that the ...
|
| Electromagnet vs headphones | 8/21/2009 |
Q: Could an electromagnet interfere with ordinary operating headphones? If so, how strong/large would ...
A: Yes, an electromagnet could interfere with ordinary operating headphones. But a mobile phone could ...
|
| Accelerometer | 8/20/2009 |
Q: Johnson I am building an application (for personal use) for my mobile phone that uses the build in ...
A: Some general comments first. Accelerating from zero to 100 km/hr in 10 seconds would require average ...
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| chemistry | 8/19/2009 |
Q: Q1. Calculate the mass ratio of the following properties for 1.0 Kg of air versus 1.0 kg of iron at ...
A: I don't know what you mean by "mass ratio". To Wikipedia, mass ratio is a measure of the ...
|
| What is the real formula for a doorknob/handle.(using physic & A LOT OF DETAIL)? | 8/17/2009 |
Q: What is the real formula for a doorknob/handle.(using physic & A LOT OF DETAIL)? I am trying to find ...
A: Since you didn't say, I will assume that you want a formula that gives the relationship between ...
|
| pitch angular | 8/14/2009 |
Q: i have a buoy with 6 degrees of freedom. i want to know a relationship between ocean wave height and ...
A: A few assumptions: I assume you meant roll instead of row. I will approximate wave shape as ...
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| free fall | 8/13/2009 |
Q: A human free fallilng can reach velocity in excess of 130mph.How do they breathe wil air rushing so ...
A: Interesting question. And interesting answer. I had to search for it -- otherwise I would have waved ...
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| Light | 8/10/2009 |
Q: If the image formed in a plane mirror is virtual how are we able to view it?Is reflection different ...
A: You appear to see the object behind the mirror. But the object is really on your side of the mirror. ...
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| Rainbow | 8/3/2009 |
Q: How the water droplet or a prism is able to separate the white light in to 7 colors? How the UV and ...
A: Rainbow: All electromagnetic radiation travels at the speed c when it's in a vacuum. Air is almost ...
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| First law of thermodynamics | 7/29/2009 |
Q: I'm on a work placement for my college course. I've been asked to find the time it takes one of the ...
A: For the oven to cool down, heat must fight it's way through the oven's insulation to the oven's ...
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| generators | 7/28/2009 |
Q: how does a dynamo work? where is it located?
A: The discoveries that led to Faraday's Law are the foundation for the operation of a dynamo. See the ...
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| pls. help me ^_^ | 7/27/2009 |
Q: a piano weighing 600 lbs is to be raised to a platform 4 ft high by a plank 10 ft long. If the ...
A: I assume that the piano is to be moved at constant velocity. Therefore, no acceleration, therefore ...
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| Power Problem | 7/9/2009 |
Q: An electric heater is operated by applying a potential difference of 50.0 V to a nichrome wire of ...
A: a) The current that would flow is given by Ohm's Law I = V/R where V = 50 volts and R = 8.00 ohms. ...
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| FM/AM Transmitter and receiver | 7/8/2009 |
Q: I am having trouble hearing the minister's sermon at church. I am using their headphone, but still ...
A: You say you are using the church's headphone? Is it the kind of system where the pews are wired with ...
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| Regarding Electric field and point charge! | 7/7/2009 |
Q: Johnson, This is what's given: In a rectangular coordinate system, a positive point charge q ...
A: 1) At any point, the existing field would be the vector sum of the individual fields produced by the ...
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| velocity of rain water | 7/1/2009 |
Q: whatis the velocity of rain water? what is the velocity of water flowing from a slope of 15 degrees.
A: Sorry this answer is overdue. When things fall far enough through air, there is a maximum speed they ...
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| terminal velocity | 6/27/2009 |
Q: Is the impact of an falling object at terminal velocity greater on water or ground? In other words, ...
A: In the 2 cases, the momentum at impact (mass times velocity) would be the same. And in both cases, ...
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| electrostats | 6/24/2009 |
Q: what is the name given to charges which goes inside the earth when a conductor is charged by ...
A: Let me describe a scenario. Imagine some wire bent so that it makes 350 degrees of a loop. The loop ...
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| physics | 6/23/2009 |
Q: In ionosphere ,when sun light strikes on a air particles which phenomena occur?
A: The ionosphere gets its name from the phenomenon of ionization. I did a search [ionosphere sunlight ...
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| physics | 6/21/2009 |
Q: A car (mass 3M) has a maximum acceleration of 3 m/s2. What would be the car's new maximum ...
A: First, the accepted way to show an exponent when you can't do a superscript: 3 m/s^2 (to get the ^, ...
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| physics | 6/20/2009 |
Q: i tried to find the exact answer but i did't get succeed. what changes occur in the refractive index ...
A: I found a graph of the changes in the index of refraction of fused quartz versus wavelength. Here's ...
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| physics | 6/19/2009 |
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: 1) The figure given is a good starting point for a free body diagram. Typically a free body diagram ...
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| investigatory project in Physics | 6/18/2009 |
Q: Greetings! Can you give me ideas about invesigatory project relating to Physics for high school ...
A: I think it would be best for your project to be on a subject that interests you. Allexperts.com has ...
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| investi pros | 6/17/2009 |
Q: could i just ask for a very interesting investigatory project regarding either physics., chemistry, ...
A: I think it would be best for your project to be on a subject that interests you and matches your ...
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| Light | 6/16/2009 |
Q: Light waves from the sun is unpolarised and can oscillate about its E-field axis.Is this true for EM ...
A: I'm not sure how you mean "can oscillate about its E-field axis". The E and B fields oscillate (or ...
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| physics | 6/15/2009 |
Q: A stone is thrown downward with a speed of 13 m/s from a height of 13 m. (acceleration due to ...
A: a) The kinematic equation (one of 4 you were probably given recently) Vf^2 = Vo^2 + 2*a*s is the ...
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| kinetic theory | 6/14/2009 |
Q: If L be the mean free path of a gas molecule in a gas , which is the mean free path along an ...
A: The mean free path will still have a length L. That's if I'm interpreting the question the way you ...
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| Capacitance | 6/13/2009 |
Q: Two capacitors of capacitances 22*10^-6F & 47*10^-6F are connected in series with a constant 24V ...
A: a) The equation for finding equivalent capacitance when you have series capacitors is like the one ...
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| physics | 6/11/2009 |
Q: a refractive index of 'A' is 1.41 and 'B' is 1.60 State which medium is denser? In which medium the ...
A: The refractive index of a vacuum is 1.00. That's the least optically dense 'material'. As you ...
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| gravity | 6/10/2009 |
Q: If I can jump vertically upwards with an initial velocity of X m/sec and I can reach y meters on ...
A: First let's try to determine the forces involved during the push-off for the jump on Earth. Looking ...
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| steam and turbines | 6/9/2009 |
Q: steam enters a turbine at 1300.000kPa, dry and saturated. The steam is exhausted from the turbine ...
A: I assume that pressure data is gauge pressure, the difference between atmospheric and the pressure ...
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| Transition Energy | 6/8/2009 |
Q: Take a Hydrogen atom with electron in first shell......... its energy would be equal to -2.18 X ...
A: This is an interesting question -- one I had to study to try and answer. As my profile says this is ...
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| Physics of satellite orbits | 6/7/2009 |
Q: Typical explanation: Sufficient tangential constant velocity {not an acceleration)in combination ...
A: I think what you're missing is basically that the earth is a sphere and what that means to the ...
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| flux linkage and permeance | 6/6/2009 |
Q: I'm having a bit of trouble trying to understand the difference between flux linkage and permeance. ...
A: Permeance, P, is the inverse of reluctance, Rm. (I'm using Rm for reluctance because I can't select ...
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| resistance | 6/5/2009 |
Q: To make 1 ohms resistance,temperature should be 1)0 2)Moderate 3) High 4) Low
A: That depends on the material you're working with. For instance if you had a 1 meter long piece of ...
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| Frictionless | 6/4/2009 |
Q: How are you? If i push a book resting on a frictionless surface..assume no other forces exist,then ...
A: I'm doing well, good to hear from you. The easy answer is yes ... approaching the speed of light. ...
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| peltier effect | 6/3/2009 |
Q: sorry sir i am asking this question after asking what is seebeck effect. i want to know that why ...
A: The Peltier effect is the compliment to the Seebeck effect. Explaining is very difficult. I found ...
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| seebeck effect | 6/2/2009 |
Q: sir can you explain what is seebeck effect ? i tried to find out through net but unable to ...
A: Look at the diagram on this site. http://en.wikipedia.org/wiki/Seebeck_effect#Seebeck_effect Not ...
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| Mechanical advantage of compound pulleys | 6/1/2009 |
Q: I'm having some trouble finding information about the mechanical advantage of additional pulleys ...
A: Let's talk about the 2 pulley 200/50 system first. This gives you a 4:1 gain in load rotation speed ...
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| Differences in electric field | 5/31/2009 |
Q: What are the differences between electric and magnetic fields?Many thanks
A: A single charge can set up an electric field that just radiates out to infinity. There is no such ...
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| physics | 5/21/2009 |
Q: please tell me the answer to it 1) two oppositely charged conducting spheres of magnitudes supose 3C ...
A: 1) For the sake of discussion, let the charges be +3C and -5C. Then after the spheres are touched ...
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| Hydrogen fuel from PV | 5/20/2009 |
Q: Hopefully this isn't too basic, but it seems so obvious to me. If you set up a Photo Voltaic cell, ...
A: Your idea is technically feasible. Unfortunately it's not economically feasible -- at least not yet. ...
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| Rocket Help | 5/19/2009 |
Q: I am in high school physics and we are working on a project by building rockets with an A8-3 engine. ...
A: It's true that the acceleration will be given by F=ma. But understand that F must be the net force ...
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| electrcity(gauss theorem) | 5/18/2009 |
Q: Consider a open hemisphere (i.e. it has open base).If a charge "q" is placed at any point on the ...
A: Interpretation is a problem here. First think of a hollow closed sphere of some insulating material. ...
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| Impulse and Momentum | 5/17/2009 |
Q: In a ballistics test, a 25 g bullet travelling horizontally at 1200m/s goes through a 30cm thick ...
A: Let me start with the 2nd question. B) Momentum will be conserved. Momentum before = momentum after ...
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| anchor cable | 5/16/2009 |
Q: A ship at anchor using sufficient chain anchor cable for the prevailing wind strength will surge ...
A: Since the ship normally surges back and forth, the velocity normally changes from positive to ...
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| heat | 5/14/2009 |
Q: At what temperature does the filament of electric bulb glows ?
A: When a hot body is emitting energy in the form of light, the color of the light is tied to its ...
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| solving for theta 2 | 5/13/2009 |
Q: The vitreous humor in the eye has a refractive index of n = 1.336. If the angle of incidence of a ...
A: The equation is a statement of Snell's Law. See http://en.wikipedia.org/wiki/Refraction The ...
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| physics | 5/12/2009 |
Q: Why it is easy to pull a suitcase instead of pushing it?I want this in equations.please send me ...
A: I assume that whether you are pulling or pushing, the force is exerted at the same angle theta ...
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| mickey | 5/11/2009 |
Q: The vitreous humor in the eye has a refractive index of n = 1.336. If the angle of incidence of a ...
A: The light reaches the eyeball with an angle of incidence theta1. Theta1 is measured between the ...
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| Constructive interference condition. | 5/6/2009 |
Q: A thin air gap of thickness d is present between two sheets of glass of thickness L. Suppose m is an ...
A: You can discount a) because the interference is occurring because of the path length in the air gap, ...
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| physics | 5/2/2009 |
Q: an elevator weighing 10,000N is supported by a steel cable. what is the tension in the cable when ...
A: If the elevator car is accelerating up at 3 m/s^2, there is a net force acting on the car given by ...
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| physics | 5/1/2009 |
Q: the rotating space station your standing in stimulates earths gravity when you are 500ft from its ...
A: The simulated gravity has you standing so that if the station were a big soup can, you would be ...
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| optics - fisheye lens | 4/29/2009 |
Q: "Is there a mechanical or post image process to reverse a fisheye lens view? I was interested in ...
A: Yes, that can be done. See http://thesybersite.com/general/12mm-fisheye/index.htm Go down to section ...
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| egg lab | 4/28/2009 |
Q: I'm suppose to hang a certain amount of mass from a spring and let it fall so that it only touches ...
A: So that you know how I'm picturing this: You support the mass so the spring is at it's rest length ...
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| physics (motion/mechanics) | 4/27/2009 |
Q: A car needs to generate in order to maintain a constant velocity of on a flat road. What is the ...
A: There seems to be a couple gaps in your question. Let me guess at what you meant: A car needs to ...
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| Electricity | 4/24/2009 |
Q: A common theme in science fiction is technologies or aliens which are able to nullify all use of ...
A: Your question is hypothetical, so I started by letting my imagination go. Are permanent magnets ...
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| radar guns and electromagnetic properties | 4/22/2009 |
Q: Some coworkers and I got into a discussion about radar guns (we're software engineers, so this isn't ...
A: Yes, the radar gun's own velocity has a bearing on the reading it takes. Radar guns use the Doppler ...
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| Nozzle flow | 4/19/2009 |
Q: I am solving a problem on nozzle flow..i was analysing the results..i am actually using a CFD ...
A: This is a very complex topic. It's not something I learned about in my time on the Space Shuttle. I ...
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| Physics help | 4/18/2009 |
Q: I am having trouble with a few study questions and would appreciate the help. 1.How much work is ...
A: 1. Nothing is said about friction, so apparently we are to ignore it. By conservation of energy, the ...
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| Logic gate | 4/16/2009 |
Q: Show that 1+1=6 logically
A: Since you gave "Logic gate" as the subject, I assume we are talking about Boolean algebra. In ...
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| Electric Aircraft | 4/15/2009 |
Q: I saw your answer about cost of running an electric car. How feasible is an electric commuter ...
A: I don't know nearly as much about the power requirements of a plane as I do for a car. I searched ...
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| Blood Pressure | 4/14/2009 |
Q: Does the blood pressure change at different heights like would it be different in the legs and the ...
A: There is a test, called Ankle Brachial Pressure Index (ABPI), that compares systolic blood pressure ...
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| Physics-Index of Refraction | 4/13/2009 |
Q: Hey, okay so i was doing an experiment that has to do with the index of refraction for different ...
A: I did a yahoo search for ["index of refraction" "sea water"] and the first 10 hits included these 2 ...
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| Physics: vibrations and waves | 4/11/2009 |
Q: I'm having problems rearranging a formula and was hoping you could help. The question has 4 parts: ...
A: Yes, we have the relationship you gave to work with. And one other: 2*L = v/f where f is the ...
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| Frontal offset collision | 4/10/2009 |
Q: Their is a frontal offset collision between a 2004 Pontiac grand am weighing 3640 lbs going at 43 ...
A: Unfortunately your image didn't come through. The details about the location of the contact and the ...
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| 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: I need to guess at something. Is the block launched to the left or right? I'll guess right. When ...
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| Is this possible at all?? | 4/6/2009 |
Q: A 900 yard par 3 is in South Africa. The green is shaped like the African continent and completely ...
A: It's not possible without more information. Perhaps it expects you to make assumptions. Some ...
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| Temperature | 4/4/2009 |
Q: 1)how can i relate the temperature of a body to kinectic energy? 2)what is the formula when ...
A: 1) A short explanation of temperature (in kelvin) is that it's proportional to the average kinetic ...
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| The speed of a hit baseball | 4/3/2009 |
Q: I have a question about a baseball thrown by a pitcher. If the batter has a constant hand and swing ...
A: In addition to agreeing that the batter has a constant hand and swing speed, we also need to agree ...
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| Electrostatics | 4/1/2009 |
Q: I have a question that is sort of hard to ask simply. But I hope my explanation will be sufficient. ...
A: The table could have been neutral originally. But when the balloon and table touched, the balloon ...
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| Calculating electric force | 3/31/2009 |
Q: Your Question calculating net electric force help needed right away? A small metal sphere (-2.10 x ...
A: The force of attraction/repulsion between any 2 charges follows the relationship F = ...
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| buoy | 3/30/2009 |
Q: i don't want you to answer my question. i only want you to recommend some refrences.it's not my ...
A: Well I don't think you got the Steve that you intended. I'm Steve Johnson. But since it came to me, ...
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| Physics | 3/29/2009 |
Q: 1. a .13 kg balll is swung vertically from a 0.50 m cord in uniform circular motion at speed of 2.4 ...
A: 1. To keep it going in a circle, the net force acting on the ball must be a centripetal force, given ...
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| physics 12 Induction(flux) | 3/26/2009 |
Q: a loop of wire of area .32m squared is placed in a .75 T megnetic field. the magnetic field is ...
A: Faraday's Law says that emf = -d(Phi)/d(time) Phi is the symbol used for magnetic flux (I can't do ...
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| Magnetic field | 3/25/2009 |
Q: Give an equation that represents the radius of curvature of an ion’s path as it passes through a ...
A: Let the ion have mass m, charge q, and velocity v. And let the field strength be B. A force will be ...
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| Magnetic finding electrostatic force | 3/24/2009 |
Q: Can anyone help me with Numerical Response 6 and question 19 on this website ( questions are on ...
A: 6. This problem needs the answer you chose for velocity in question #18. I'll call that V18. Since ...
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| physics | 3/23/2009 |
Q: An automobile initially moving at 72 km/hr jams the brakes and skids to a stop in a distance of 24 ...
A: The original kinetic energy is given by KE = (1/2)*m*v*2 First convert the km/hr to m/s: 72 km/hr * ...
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| buoy | 3/22/2009 |
Q: i want to know about total forces on a floating structure or buoy.i want to calculate these forces ...
A: That would be very much related to the shape of the structure or buoy. First consider a boat at ...
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| Force at x direction | 3/21/2009 |
Q: 1 i have one question.If one block have a force from Up,Fy=200N and at side left and right it have ...
A: I'm not sure if I'm interpreting your question the way you mean it. It seems like there are forces ...
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| 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 they are brought into contact, the 1.70uC will neutralize -1.70uC from the mass with -2.50uC ...
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| Question | 3/19/2009 |
Q: On an amusement park ride, passenger are seated in a horizontal circle of radius 7.5m. The seats ...
A: Angular acceleration can be calculated (in this case) using this equation Wf = Wo + alpha*t where ...
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| electric force | 3/18/2009 |
Q: If the electric field strength between 2 charged particles that are 1.55m apart is 2.70 x 10^-4 N, ...
A: Electric field strength is measured in volts/meter. You gave units of Newtons for the first case and ...
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| electric field | 3/17/2009 |
Q: "Hi, A 2.5uC charge is placed 10.0 cm from a 7.0uC charge. At what point between the 2 charges ...
A: Net electric field is a vector sum. You individually consider the field from each individual charge ...
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| electric potential | 3/16/2009 |
Q: an investigation is performed using a apparatus. Electrons are accelerated from rest from the ...
A: 1) The electrons are given kinetic energy. Consider a single electron. KE given to one electron is ...
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| electrostatic force | 3/14/2009 |
Q: Can you please show me how to do questions 13 and Numerical Response 7 on this site: ...
A: 13. If q1 were the only other charge in q2's neighborhood, q2 would experience a force F1. If q3 ...
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| Physics | 3/13/2009 |
Q: A 0.175-kg coffee cup is placed on a merry-go-round with uS=.70, 3m from the center of rotation. The ...
A: We need to convert the given rotational speed to units of radians/second. Then we generally call it ...
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| Spin applied to a ce ball | 3/12/2009 |
Q: When striking a cue ball slightly to the left of center which direction does it spin? I've been told ...
A: A more common spin put on a cue ball is backspin. Make a sketch from the viewpoint as if your ...
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| Gaussian surface | 3/11/2009 |
Q: .as a follow up: 1) What is a Gaussian surface 2) What difference wiuld it make if I had a charge ...
A: 1) A Gaussian surface is a closed hypothetical surface. I indicated in the previous answer that the ...
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| surface wave propagation in real life | 3/10/2009 |
Q: In real life, when a solid material (such as a piece of wood or plastic - not perfectly isotropic ...
A: Please understand, I don't have any study or experience to support my intuitive reaction to your ...
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| electric field | 3/9/2009 |
Q: sir few questions related to electric field 1) Why no field can exist inside a conductor? or why ...
A: 1) If a chunk of conductor is placed in an existing electric field, the mobile charges in the ...
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| Gauss Law | 3/8/2009 |
Q: Why is the electric field inside a conducting shell zero and how is this a consequence of Gauss law? ...
A: One more assumption that is required is that there be no charges placed inside the shell (such as on ...
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| 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. If you had asked if the speeds were equal, I would say yes. But velocity is a vector so the ...
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| Physics | 3/5/2009 |
Q: 1. A stone is thrown horizontally at a speed of 5.0 m/s from the top of a cliff that is 78.4 m high. ...
A: 1a. The time for the stone to reach the bottom of the cliff is the same as if it were merely dropped ...
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| 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: 1a. During the canter, it goes 116 m, during the gallop, it goes 58 m -- total distance 116+58 ...
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| physics | 3/2/2009 |
Q: if there is no friction how much time the body will take to come to rest?
A: If the moving body is going vertically up, it will stop briefly when all of its kinetic energy has ...
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| The LHC | 3/1/2009 |
Q: Greetings, I am endeavoring in a research project on the Large Hadron Collider. I have succeed in ...
A: For Pros, I would simply say discovery, knowledge and understanding. You say you have learned the ...
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| collision | 2/28/2009 |
Q: How are you? I am in a car moving at constant speed towards another similar car (in every aspect).I ...
A: I'm doing well, thanks -- hope you aren't hurt in the collision. No. Newton's 3rd says that the 2 ...
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| SHM | 2/26/2009 |
Q: sir i am unable to get the answer for the following numericals. Can you explain how to solve them. ...
A: 1) My initial interpretation of the problem was that a single hydrogen atom has a bond with material ...
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| Physics (Friction and Forces) | 2/25/2009 |
Q: Book: physics Principles and problems 17. A girl exerts a 36 N horizontal force as she pulls a 52 N ...
A: 17. The coefficient of kinetic friction has this relationship between force of friction and the ...
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| rotational motion and the law of gravity | 2/24/2009 |
Q: a car traveling at 30.0m/s undergoes a constant negative acceleration of magnitude of 2.00m/s^2 when ...
A: This kinematic equation will give you the distance traveled: Vf^2 = Vo^2 + 2*a*s where Vf is final ...
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| What is the most effective way to produce AC from a (DC) battery (-ies) ? | 2/23/2009 |
Q: I must thank you for your recent answer, it was useful ! I want to make an analysis about an ...
A: The site http://en.wikipedia.org/wiki/Crystal_oscillator indicates that "Quartz timing crystals are ...
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| Ideal gas n thermodynamic | 2/22/2009 |
Q: The specific latent heat of vaporisation of steam is 2.26MJKg^-1.When 50cm^3 of water is boiled at ...
A: a) Converting the volume of liquid water to m^3: 50 cm^3 = 50*(10^-6 m^3) = 5.0*10^-5 m^3 Using the ...
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| friction | 2/21/2009 |
Q: Why does frictional force increase when surfaces in contact are polished beyond a certain extent? ...
A: That's interesting. I suspect, but I might be wrong -- again, that both have to be the same metal or ...
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| Physics | 2/20/2009 |
Q: Find the ampliture, frequency and period of an object vibrating at the end of a spring, if the ...
A: The equation you gave is a standard way to describe an oscillation. It is more often a sine function ...
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| friction | 2/19/2009 |
Q: Why does frictional force increase when surfaces in contact are polished beyond a certain extent?
A: I learned as a kid that my mother's freshly waxed floors were slippery. Walking on them wearing ...
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| I'm a physics student who has to do a experiment on trash and its effects on student life. | 2/17/2009 |
Q: I'm not sure if you ever herd of group iv but basically its a huge experimentation with all of the ...
A: Hmm -- trash, Physics and the effects on students' lives. First, what can we see about the ...
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| Hammer Rotation Puzzler.??? | 2/16/2009 |
Q: .. Below is a link that shows a blond Russian lady Hammer thrower (ther are about 4 other ...
A: You indicated in some of the versions of your question that you would tell us what you thought the ...
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| Abour Uniform Circular Motion | 2/15/2009 |
Q: A mass of 0.5Kg is whirled at 120 rpm in a horizontal circle at the end of a string 2 meters long. ...
A: a) Angular velocity is expected to be in units of radians per second. You have rotational velocity ...
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| The Best Magnetic core material | 2/14/2009 |
Q: We want to build for a science fair project a pulsed electromagnet. The pulse from an accumulator or ...
A: I regret that design of magnetic devices was not something my career gave me any experience in. So I ...
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| vectors problem | 2/13/2009 |
Q: I was having a bit of trouble with a homework problem and was wondering if you could help in ...
A: Just to be sure you can draw this: Island 1 is at the origin of an x-y (or EastWest-NorthSouth) ...
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| Circular Motion | 2/12/2009 |
Q: In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital ...
A: A body in motion tends to continue with no change in its velocity vector, meaning it tends to move ...
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| 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: The thrower is the center of the rotation during the throw. As it's flying on its own, the handle ...
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| impact load on an IC | 2/10/2009 |
Q: I want to use a device rated at up to 8g. will it withstand a 500KG impact , I don't know the ...
A: I really need more information. My first reaction was to say that 500 kilograms is 500,000 grams, a ...
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| average weight on scales? | 2/7/2009 |
Q: If a person weighing 100 lbs. started juggling three balls weighing 5 pounds each, stepped on ...
A: This is an interesting question! Clearly if the person just stood there holding one of the balls, ...
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| physics | 2/5/2009 |
Q: how can objects move with constant velocity even when an appiled force acts on them because the ...
A: I could say that you answered your own question. If I break what you wrote in 2 pieces, the second ...
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| Motion | 2/4/2009 |
Q: 1. When do you consider an object to be moving? 2. How is the change in position of an object ...
A: 1. That's actually hard to define easily because most of the words I want to use mean about the same ...
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| elecetrostatics | 1/30/2009 |
Q: Differentiate between electric potential and electric potential energy at a point in an electric ...
A: Electric potential: The phrase electric potential is used in this sense: "The electric potential ...
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| STATIC COEFFICIENT | 1/28/2009 |
Q: STEVE, i HAVE A PROBLEM THAT ASKS FOR THE STATIC COEFFICIENT GIVEN ONLY THAT I HAVE A BOX THAT ...
A: Just to be sure: I'll assume the 18 degrees is measured from horizontal. And I will assume they ...
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| eLectrics | 1/27/2009 |
Q: A small plastic ball of mass 6.90 multiplied by 10-3 kg and charge +0.150 µC is suspended from an ...
A: Please allow me to show you how to make exponents here. Use the "^". (shift+6) So it would look like ...
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| linear motion | 1/26/2009 |
Q: What is the impact speed when a car moving at 100km/h bumps into the rear of another car traveling ...
A: If you were in the slower car, watching the faster car coming toward you (and if you could ignore ...
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| Power Grids | 1/25/2009 |
Q: The following video shows a substation cutting the power: http://uk.youtube.com/watch?v=hIkNY5xjy5k ...
A: Inductors store energy. When there is current flowing through an inductor, it stores energy and uses ...
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| Micrometeorites and the Moon | 1/23/2009 |
Q: Steve, I am stuck on this question. Can you help point me in the right direction? If one ...
A: One micrometeorite will consume the same space as a cube with the dimensions of the diameter of the ...
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| reversible process | 1/21/2009 |
Q: sir i know this is out of your subject expertise but since whenever i have asked any question to u i ...
A: Of all classical physics, this is perhaps the most difficult concept to accept as logical, in my ...
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| Physics: balancing torques | 1/20/2009 |
Q: I'm having trouble with all the different weights. I would appreciate help with this problem: A ...
A: You can arrange just about any combination of weights for balance by placing them in the right ...
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| reversible process | 1/19/2009 |
Q: sir i know this is out of your subject expertise but since whenever i have asked any question to u i ...
A: I'm happy I've satisfied you in the past. Let's see how this turns out. I reviewed my old college ...
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| physics | 1/18/2009 |
Q: How high will a body rise that is projected vertically upward with a speed of 100ft/s? How long will ...
A: I expect you have been given a set of 4 kinematic formulas. To choose the one that will work on your ...
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| Gravitation | 1/16/2009 |
Q: How will you draw the graph of Kepler's Third Law- i.e. Square of Time Period proportional to Cube ...
A: I did a yahoo search for ["Kepler's Third Law" graph] and got sites with different ways of plotting ...
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| Physics | 1/15/2009 |
Q: What is the positive and negative charges in physics langauge?Please tell me 5 positive points and 5 ...
A: There really is no significant meaning to the names given to the 2 electrostatic charges. It's ...
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| law in physics | 1/14/2009 |
Q: I was wondering what the law in physics means that for every action there is an equal and opposite ...
A: Newton's 3rd Law refers to actions of 2 bodies on each other. If body A exerts a force on body B, ...
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| velocity | 1/13/2009 |
Q: how do you find the maximum velocity of water shot from a water gun? At what point does the squit ...
A: If you're shooting your squirt gun out a window at someone below you, that complicates things (the ...
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| Gravity Machine | 1/12/2009 |
Q: Is there a machine that can multiply gravity? Or is it possible to build one?
A: If such a thing does exist, it's a big secret. I very much doubt it. On your 2nd question, I know ...
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| electronics | 1/10/2009 |
Q: how will i make a generator out of aluminum foil and without using any magnet?
A: Unfortunately I don't know what you wish to generate. I did a search for {"aluminum foil" generator] ...
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| Physics | 1/7/2009 |
Q: You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a ...
A: First, I'm on mission to teach people how to do exponents on a site like this. Use the caret, ^ ...
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| time dilation | 1/6/2009 |
Q: does the dilation mean that time really passes more slowly in moving system or that it only seems to ...
A: I said in my profile that I decline questions on relativity and Atomic Physics. But I think I can ...
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| Potential and Internal Energy | 1/5/2009 |
Q: When doing an experiment, if you set up a an aluminum cylinder with a weighted bucket on one side ...
A: I'm trying to develop a picture in my mind. I have an aluminum cylinder, laying on a table with its ...
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| Physics | 1/2/2009 |
Q: A 5.3 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket ...
A: I imagine you know Newton's 2nd Law. The equation F=m*a is a common way to express it. Using that ...
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| 9th grade physics | 1/1/2009 |
Q: If the optimal angle is 45 degrees for achieving the maximum distance when shooting a canon ball in ...
A: With experiments, it's important to control the consistency of the things you don't want to change ...
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| physics | 12/31/2008 |
Q: A 9.0 kg present (which you hope is your new gaming system) sits on your rough, level carpet. YOu ...
A: If it requires 61 N, applied horizontally, to slide it horizontally, then the force of static ...
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| Physics | 12/30/2008 |
Q: salini filled water in a plastic bottle. she then made a hloe on the bottom of it. water came out ...
A: E.S, I'll assume the bottle has a tight cap. Now, a review the sequence of events: When the bottle ...
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| how much force | 12/28/2008 |
Q: a speaker is set up on a stand that weighs about 55lbs. how much force does it take to move the ...
A: I need to make some assumptions about the problem: a speaker, and its stand, weigh about 55lbs and ...
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| optics | 12/27/2008 |
Q: How does the temperature of sugar (eg. glucose or fructose) solutions affect the angle at which it ...
A: I'm sorry, I didn't even know about this phenomenon of rotation of polarised light. I found some web ...
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| Potential and kinetic energy/Springs | 12/26/2008 |
Q: This question was on my final for mechanics. A 5 kg block rests on a frictionless hill attached to a ...
A: I think there are some missing details. I can't tell how or if the 2 blocks are connected to each ...
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| electromagnetic field | 12/23/2008 |
Q: Can you tell me please, why a neon tube traversed by an electric current doesn't attract ...
A: If you increase the current, you will increase the strength of the magnetic field. There's a direct ...
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| electromagnetic field | 12/21/2008 |
Q: Can you tell me please, why a neon tube traversed by an electric current doesn't attract ...
A: Remember that the lines of magnetic induction for a long straight wire, carrying current i, are ...
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| Residential Electrical Circuits | 12/18/2008 |
Q: Mr. Johnson: I have seen interesting information about 'dirty' electricity on the Graham-Stetzer, ...
A: Instead of dirt, I use the term noise. Electro-magnetic interference (EMI) is the technical term. ...
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| rotational mechanics | 12/16/2008 |
Q: How can one predict which hemisphere of earth we are in by looking at the direction of rotation of ...
A: Many people believe that "all basins" in the northern hemisphere rotate one way and the other in the ...
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| Force distance in air | 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: This tragedy has been analyzed by people who had access to details of the towers. Even with the ...
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| resonance | 12/10/2008 |
Q: sir this is regarding resonance if you can refer the following site page 8 and 9 on forced vibration ...
A: OK, I can see what's behind your question. You're saying "I see what the math says, but it doesn't ...
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| Newtonian Kinematics | 12/8/2008 |
Q: I have a few questions; however they are similar and perhaps even maybe have the same answer. What ...
A: 4 equation linear kinematics model? I use equations that assume that original or final displacement ...
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| electrostatics | 12/7/2008 |
Q: what is meant by electrostatics & is it really that the charges didnt move
A: When you rub a glass rod with silk, the glass rod becomes positively charged and the silk becomes ...
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| Fluid/presure | 12/5/2008 |
Q: Hey, MR.Steve, i need you help on this question. Please take a look at it The drawing shows a ...
A: The weight of the rock is the force, Fo, applied to the system at the output plunger. This causes ...
|
| Fluids Help | 12/4/2008 |
Q: Hey Sir, I got a question on fluids. Could you please look into it and help me. Thanks a lot! ...
A: The area of the roof is 3.7 x 4.5 m^2. The pressure that will just equal the maximum the roof can ...
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| 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: 1) In pool, there is a complication in that spin can be put on the ball. Spin affects the behavior ...
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| conductors | 11/29/2008 |
Q: if a charge is placed inside a hollow spherical conductor, not at the center, how will be the ...
A: This is going to be hard to describe and probably hard for you to picture. Draw a cross section of ...
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| surface tension | 11/27/2008 |
Q: sir why do we see two meniscus in liquid inside glass tube? Lower meniscus and upper meniscus. I ...
A: Surface tension, cohesive force and adhesive force don't agree on the preferred shape of a meniscus. ...
|
| Egg drop- energy conservation | 11/25/2008 |
Q: how would you explain energy conservation in an egg drop (with no parachutes, foam, cotton balls, ...
A: From the height that egg starts at, it has gravitational potential energy. This energy will be ...
|
| Fluids/Pressure | 11/21/2008 |
Q: Hey Sir, I need help on this question. I hope you please take a look at this and explain to me how ...
A: I found 2 sources http://hypertextbook.com/facts/1999/KatrinaJones.shtml and ...
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| project on friction | 11/19/2008 |
Q: I want to design a machine which can climb up or down over a rope with friction only without help of ...
A: A few more details would have helped me. I'll list a few general thoughts but also list some of the ...
|
| Parallel Circuits and light bulbs | 11/18/2008 |
Q: I have so far learned that theoretically, light bulbs connected in parallel circuits have the same ...
A: If theory was not followed, some assumption made in the statement of the theory must have been ...
|
| aero foil | 11/17/2008 |
Q: ) Aerofoils are designed to speed up air flow on the upper section thus prodicing lift.How then can ...
A: In addition to lift due to the wing shape, lift is produced by the angle of the airfoil. Imagine a ...
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| Force and acceleration | 11/15/2008 |
Q: When taking off, fully loaded the mass of the plane is 2560kg.The two jet engines can exert a total ...
A: 1. Newton's 2nd Law says that mass m undergoes acceleration a when a net force Fn is exerted on it ...
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| semiconductors | 11/14/2008 |
Q: can u clearly figure out whats going on in p-n junction and please give me a detailed information ...
A: I have found several websites for you that will do a better job of explaining than I could. Please ...
|
| velocity of a softball | 11/13/2008 |
Q: Mr Johnson, In my physics class we are doing a project on the physics of sports, and i chose the ...
A: In this question I think we need to ignore any speed given by a flick of the wrist or forearm. So ...
|
| Gravitation and Newton's Synthesis | 11/11/2008 |
Q: The Sun's gravitational pull on the Earth is much larger than the Moon's. Yet the Moon's is mainly ...
A: As the Earth rotates on its axis each day, the distance from the Moon to water molecules near the ...
|
| Physics problem Force and Acceleration | 11/10/2008 |
Q: Claudia stubs her toe on the coffee table with a force of 100 N. Ignoring any frictional effects, ...
A: a) If Claudia's toe exerts 100 N on the table, by Newton's 3rd, the table exerts 100 N on her foot. ...
|
| Conservation of Energy | 11/9/2008 |
Q: A skier of mass m starts from rest at top of a solid sphere of radius r and slides down its ...
A: a) According to Conservation of Energy, the skier's velocity will be given by v in the equation ...
|
| viscosity | 11/8/2008 |
Q: sir few questions on viscosity i all books i have read it is written that if we consider a real ...
A: 1) It is said that the fluid is flowing -- we don't know why, but there is a flow. The bottom layer ...
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| physics: work and energy | 11/5/2008 |
Q: I have two questions with which I am struggling: 1. a car is traveling horizontally at 4 m/s after ...
A: You could do both of these with kinematic equations. But I appreciate you gave "work and energy" as ...
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| gravity | 11/4/2008 |
Q: A particular race car can cover a quarter mile track (402 m) in 6.20 s starting from a standstill. ...
A: Newton's Law of Universal Gravitation says the force of attraction between any 2 bodies is F = ...
|
| Physics and tension | 11/3/2008 |
Q: Okay i'm stuck on this. you have three blocks connected by a massless string sitting on a ...
A: You are right about the acceleration, 3 m/s^2 for all 3 blocks. To understand how to calculate ...
|
| Understanding Forces | 11/2/2008 |
Q: I'm currently taking Honors Physics in Highschool and I'm still unclear on how to approach a problem ...
A: To avoid the broom rotating, I will assume the 5.0 N force is directed along the shaft (as opposed ...
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| bernoulli's theorem | 11/1/2008 |
Q: sir i am trying to understand bernoulli's theorem where the proof is given based on energy ...
A: 1) >what is meant by pressure energy in flowing fluids? That term is new to me but I think I know ...
|
| mechanics | 10/31/2008 |
Q: A Fotballer is set to kick a critical free-kick 11m from the goal during a critical match.If the ...
A: I can't give a definite numerical answer for either maximum or minimum. a) Maximum momentum ... I ...
|
| logic | 10/30/2008 |
Q: A man is trapped in a room. The room has only two possible exits: two doors. Through the first door ...
A: Three ideas that I have come up with: 1. There doesn't seem to be anything threatening about the ...
|
| braking or tuning better? | 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 will assume this is a very long wall so the car can't just do a small zig-zag and miss the ...
|
| Momentum | 10/28/2008 |
Q: Hey Mr. Johnson, I actually two questions in which I seriously need help. It would be great if you ...
A: 1. The concept is momentum before = momentum after. And momentum is m*v, mass times velocity. (In ...
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| Projectile motion | 10/27/2008 |
Q: An airplane is heading due south at a speed of 600 km/h. If a wind begins blowing from the southwest ...
A: This problem isn't about projectile motion. Projectile motion involves something projected generally ...
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| help with physics problem | 10/26/2008 |
Q: I was hoping maybe you could help me with an extra credit problem. I cant figure it out. ...
A: I'm going to display the 4 kinematic formulas with my version of variable names and number them so I ...
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| magnetic permability | 10/25/2008 |
Q: I am stuck with a concept in physics. I am using the magnetic permabililty of air in an equation but ...
A: Notice in the table in the website http://en.wikipedia.org/wiki/Permeability_(electromagnetism) ...
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| science project | 10/24/2008 |
Q: My 6th grader is doing a science project on "Can seawater be desalted by freezing. What experiment ...
A: It turns out that the answer is yes. I didn't know, so I did some searching which didn't didn't find ...
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| physics question | 10/23/2008 |
Q: The space shuttle is in a 190 mile high orbit. What are the shuttle's orbital period, in minutes, ...
A: You can solve this using equations 4.1 thru 4.5 in Section 4, The Appendix, of this site: ...
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| question | 10/21/2008 |
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: I assume the blocks are separated on the floor by a distance so that when the pulley lifts, the ...
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| Projectile Motion | 10/19/2008 |
Q: When Babe Ruth hit a homer over the 7.5m high right field fence 95m away from home plate, roughly ...
A: Let the original velocity you need to find be called Vo. It has horizontal and vertical components. ...
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| Physica | 10/18/2008 |
Q: A soccer ball is kicked down the field in three trajectories (each reaches same height but first ...
A: Since each goes equally high, each will have equal time in the air. You can treat the vertical ...
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| rotation!!!! | 10/16/2008 |
Q: i`m very much confused in rotation,momemt of inertia & torque. please help!!
A: Let's picture 2 objects that you could call wheels. One of them is a disk made of wood and the other ...
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| HT 132 KV | 10/15/2008 |
Q: I have a weighbridge installation having load cells (Transducers), 1 132 KV high tension passes over ...
A: I wonder if I misinterpreted your original question. I thought the 132 KV line was interfering with ...
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| Physics | 10/14/2008 |
Q: The velocity of 1.50 kg block sliding down a frictionless inclined plane is found to be 1.36 m/s. ...
A: Using the original & final speeds and time, use the equation Vf = Vo + a*t to find the acceleration, ...
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| Physics | 10/12/2008 |
Q: All force need not make bodies move. Will impulse be zero, even if the force is not zero? Could you ...
A: E.S, >>All force need not make bodies move. That is true. That would be a case where the vector ...
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| HT 132 KV | 10/11/2008 |
Q: I have a weighbridge installation having load cells (Transducers), 1 132 KV high tension passes over ...
A: I would expect the technical support department of the companies that supplied your load cell and/or ...
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| newtons law | 10/10/2008 |
Q: A person jumps from the roof of a house 4.8 m high. When he strikes the ground below, he bends his ...
A: You say that you are asked for downward velocity. At the moment of contact with the ground? Or maybe ...
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| newton's law | 10/9/2008 |
Q: A particular race car can cover a quarter mile track (402 m) in 6.20 s starting from a standstill. ...
A: The symbol g stands for the acceleration due to gravity. The value is 9.81 m/s^2. This is the ...
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| Hazards of 400 nm lasers? | 10/8/2008 |
Q: What hazards -- other than thermal burns -- does a 400-nanometer-wavelength continuous [i.e. ...
A: You are right about 400 nm being the longest wavelength classified as "black light". That is the ...
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| Electric Field and Application | 10/7/2008 |
Q: What is the importance/relevance to know the electric field distribution of a electrical apparatus? ...
A: If a signal cable passes through an area with a high amplitude AC electric field, it could introduce ...
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| force calulation | 10/5/2008 |
Q: i am trying to find out the equivalent mass to 50nm of force. this if applied vertically. ie what ...
A: The abbreviation nm stands for Newton-meters, a unit of torque. See this useful website ...
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| Career question | 10/4/2008 |
Q: Hey I was looking at your experience information, and the areas in physics you mentioned, such as ...
A: Interesting connection. Enjoy homecoming. I grew up in Moorhead and attended Kindergarten at what ...
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| Boiling of water | 10/3/2008 |
Q: My question involves the mechanism of water boiling. My understanding of what is happening is that ...
A: You have the right idea about temperature. And perhaps just referring to kinetic energy is enough ...
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| Magnet motion/rotation | 10/2/2008 |
Q: I have an invention that I’m putting on hold till I can figure out the physics of the concept will ...
A: I need to ask a couple questions about the experiment. 1. I'm not getting the picture of the ...
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| Physics | 10/1/2008 |
Q: A model rocket is fired vertically from rest. It has a net acceleration of 17.5m/s^2. After 1.8s, ...
A: During the powered phase of the flight Vf = Vo + a*t where Vf is final velocity, Vo is original ...
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| 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: One of the equations used when studying one dimensional motion is y = Vo*t + (1/2)*a*t^2 where y is ...
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| Kinematics of motion in a straight line-mechanics | 9/28/2008 |
Q: Cn u plz gv explaination 2 d solutions bit by bit in brief?Cz i actually cnt wrk out hw 2 use d ...
A: We can say now that the average speed, Vave = D / 6*T It's going to be important to keep track of ...
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| Mechanics-newton's law of motion-phy | 9/26/2008 |
Q: Cn u xplain the solutions steps by steps?Cz i really dnt understand wen i revise it nw.Tnxs. A ...
A: i) Friction is given by Ff = mu*N where mu is 0.2 and N is the force of the basket exerted normal to ...
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| projectile motion | 9/25/2008 |
Q: An arrow is shot into the air at an angle of 61.8 degrees above the horizontal with a speed of 21.4 ...
A: The initial y component of velocity is Vyi = Vi*sin61.8 Then you can use the general equation Vf = ...
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| gravitation | 9/24/2008 |
Q: helo 1) why is the gravitational potential enrergy of a body of mass m at any given height R from ...
A: 1) My Physics book says that "Convenience usually determines that the potential energy is taken as ...
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| Physics tension | 9/23/2008 |
Q: An elevator cable may break during acceleration when lifting a lighter load than it normally ...
A: Case 1: When the elevator is at rest, or at a constant velocity, the car is not accelerating. That's ...
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| net external forces | 9/22/2008 |
Q: Which of the following can NOT be a consequence of a net external force acting on an object? (A) ...
A: A If an object experiences acceleration, a net external force must be acting on it: Force is related ...
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| help with physics problem | 9/21/2008 |
Q: I was hoping maybe you could help me with an extra credit problem. I cant figure it out. ...
A: Ralph's ground speed will be reduced by the wind speed: vr = 25 - 8.4 = 16.6 mi/hr Ralph's time, ...
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| help with physics problem | 9/20/2008 |
Q: I was hoping maybe you could help me with an extra credit problem. I cant figure it out.
A: The image you posted seems to be a study guide or notes. I don't see a problem to be worked. I do ...
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| physics | 9/19/2008 |
Q: A skier is gliding along at 4.0 m/s on horizontal, frictionless snow. He suddenly starts down a 16° ...
A: a) The component of acceleration due to gravity pointed down the slope, ad, will be g*sin16. Use the ...
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| terminal voltage | 9/17/2008 |
Q: Why does terminal voltage decreases when more current is drawn from the cell? In my book of class ...
A: In order to increase the current drawn from a particular cell, the resistance of the external ...
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| physics, | 9/16/2008 |
Q: Pr. Electromagnetic waves travel at the speed of light and carry energy. Energy is equal to ...
A: Let's say my favorite radio station broadcasts at 94.3 MHz. Planck's constant is h = 6.625 * 10^-34 ...
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| electrophysics | 9/15/2008 |
Q: this question was in my mid final exam this year. does an increase in the frequency of sampling rate ...
A: a) Time resolution is indeed increased. If the sample frequency were 100 Hz, you would get 1 sample ...
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| gravitation | 9/14/2008 |
Q: 1) The newton's law of gravitation is strictly accurate for point masses. But if the bodies are of ...
A: 1) >what does the above statement mean? That only means that they have to be far enough apart that ...
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| centre of mass | 9/13/2008 |
Q: sir i wanted to ask 1) when a disc is rolling on a plane surface or on an inclined plane , it has ...
A: 1) The mass of a body can be represented as being concentrated at the calculated c.o.m. for many ...
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| physics | 9/12/2008 |
Q: what are the effects of earth's rotation on gravitational force?
A: A pebble sitting on the surface of the earth is moving in a circle as the earth rotates on its axis. ...
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| current | 9/11/2008 |
Q: I am puzzled over the meaning of “drawing current.” Please tell me if the following is correct. ...
A: >the current flowing through (1) the wires and (2) the motor is the same, and is determined by ...
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| electrostatics | 9/10/2008 |
Q: wat is capacity of spherical capacitor internally grounded.thorough answer
A: Capacitance is given by the equation C = q/V You might say capacitance is a measure of how much the ...
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| "Investigatory Projects" | 9/6/2008 |
Q: Mr. Steve Johnson, I'm a highschool student and I'm really here to ask you about ...
A: I need to ask you some questions: Are you just starting to study Physics? How major a project is ...
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| strong nuclear force | 9/3/2008 |
Q: is that the bond due to strong nuclear force is greater between neutron-neutrons and neutron-proton ...
A: I said in my profile that I decline questions on relativity and Atomic Physics. I'm a high school ...
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| I want to ask you 3 question | 8/27/2008 |
Q: 1.When we look at a apple? do we really "SEE" the apple with our eye? ...
A: 1. "do we really "SEE" the apple with our eye?" The definition of the word "see" has been configured ...
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| Sciintillation | 8/26/2008 |
Q: This is a follow on to my previous question. 1) are there common household products (man is this a ...
A: Most of what I am able to do for you is give you links to material related to your interests. You ...
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| mass | 8/24/2008 |
Q: i read that mass is a constent, if it is, than how could it increase with special relitivity?
A: When it is said that mass is a constant, an approximation is being used. This approximation is ...
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| rotational motion | 8/22/2008 |
Q: sir few questions 1) what is the difference between circular motion and rotational motion? all ...
A: 1) Those terms, plus revolution, can be a can of worms. My 2 dictionaries indicate that the ...
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| 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: Different approaches work for different people. I prefer to reason it out. See this answer of a ...
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| electric motor circuit | 8/20/2008 |
Q: My question concerns a 12v DC motor driving a cooling fan in a car. If there is a high resistance ...
A: When resistance develops in the line carrying power to a load, like your fan, the current does ...
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| audio and physics | 8/19/2008 |
Q: I am trying to figure out how to apply work and pressure formulas to an amplifier and speaker system ...
A: Unfortunately I'm not really up on this topic. I did some searching and found some info that helps ...
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| Doppler effect | 8/17/2008 |
Q: What is the Doppler effect?
A: The Doppler effect is the name given to a phenomenon that movies and TV often include as sound ...
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| thermodynamic | 8/16/2008 |
Q: why heat is zero in aconstant heat material
A: If a body's temperature is not increasing or decreasing, that means it is not loosing or gaining ...
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| rotational motion | 8/12/2008 |
Q: after so long i could find you available as you were always maxed out. I wanted to ask so many ...
A: 1) Interesting question. I don't think I ever had a feeling for what physics meant by that. ...
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| gravitation | 8/11/2008 |
Q: what will be the change in weight of a body if earth start spinning faster or stop spinning and if ...
A: So much detail you couldn't find the answer you wanted? Repeating: If the earth stopped spinning, a ...
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| gravitation | 8/9/2008 |
Q: what will be the change in weight of a body if earth start spinning faster or stop spinning and if ...
A: An object sitting on the surface of a spinning body -- like the earth, requires centripetal force ...
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| Physics | 8/7/2008 |
Q: What is the formula of Displacement due to gravity?
A: An object in free fall due to gravity (assuming no air drag) increases it's y displacement, over a ...
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| physics | 8/6/2008 |
Q: what is the angle between the two forces of equal magnitude when their resultant is also equal to ...
A: I'll show you 2 ways to work that out. 1) Think of the graphical method where you draw both ...
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| Electrostatics | 8/4/2008 |
Q: I have a question about concepts for you. When I study the electrostatics,there is two concepts ...
A: My use of gravity was intended to show that encountering a force that is at some angle to existing ...
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| please help me to answer this problem. | 8/3/2008 |
Q: 27.0) 1.5 kg of gas expands in a closed system from 6.5 kPa and 50L to 100L. Determine the work done ...
A: I'm going to explain the concept, the work you need to do, and get you started on all 4. The work ...
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| Electrostatics | 7/30/2008 |
Q: I have a question about concepts for you. When I study the electrostatics,there is two concepts ...
A: I agree with concept #1 (except that it doesn't say that the point charge is positive -- that's an ...
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| electricity | 7/29/2008 |
Q: Its me again:)Just read from a text book " Once we thought that electricity travels at the speed of ...
A: My followup is at the bottom. OK, found the page that claims current is faster than light. I have a ...
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| Exhaust from the rockets | 7/28/2008 |
Q: does the smoke/exhaust from rockets remain as such in the space? or gets dissolved?. because when ...
A: Most of the exhaust is expelled before the ship has reached orbit. For example the Shuttle's Main ...
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| Coefficient of Restitution | 7/25/2008 |
Q: How does the Height of Drop affect the COR of a bouncing ball? Does it simply increase as the ...
A: Ahhh, the difficulties in getting experimental data to agree with the principles. I have several ...
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| converting radio signals | 7/24/2008 |
Q: I have heard about converting radio signals into optical signals and i was wondering if you could ...
A: This technology, called Radio over Fibre or RoF, is used when a signal that is intended to be ...
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| Coefficient of Restitution | 7/23/2008 |
Q: How does the Height of Drop affect the COR of a bouncing ball? Does it simply increase as the ...
A: As the height of drop, H, increases, the height of the rebound, h, increases. The relationship ...
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| Waves | 7/22/2008 |
Q: I don't remember the right way to look at this problem. I wave two waves sin(x) and cos(3x) adding ...
A: Imagine that you placed a microphone at a random point between 2 speakers, and played a pure ...
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| air blast | 7/21/2008 |
Q: what is a air blast reject. 2. how to find torque in a conveyor.
A: It would have helped if you had explained the situations of these questions a bit. My answer is ...
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| friction | 7/20/2008 |
Q: sir i have few questions related to friction 1) I read in my book that extremely smooth surface ...
A: 1) Friction is a complex subject. The coefficient of friction for any 2 surfaces must be measured. ...
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| electricity | 7/19/2008 |
Q: Its me again:)Just read from a text book " Once we thought that electricity travels at the speed of ...
A: That electricity can travel travel faster than the speed of light was news to me. I did some ...
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| gravity | 7/18/2008 |
Q: imagine two equal plane one of them is on earth and the other one is on mars which of them needs ...
A: Gravity on Mars is less than here. To figure the ratio: Acceleration due to gravity: Earth 9.8 ...
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| electricity&magnetism | 7/17/2008 |
Q: sir, imagine a situation when we are standing in an elevator,a uniform magnetic field is existing ...
A: Whether or not a magnetic field would cause a force to be exerted on an electron depends on whether ...
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| Transference of energy | 7/15/2008 |
Q: I was wondering if you could help me. Can you tell me how fast my car (weighing 1192 Kg)would have ...
A: Let me explain why it's difficult to answer. For your car to come to a stop, it needs to decelerate ...
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| magnet | 7/14/2008 |
Q: I have a long series of questions related to magnetic fields and I would like to find the answers on ...
A: I have seen good sites with physics lessons online, unfortunately I haven't recorded the url of any ...
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| What physics calculation(s) would be used in this scenario? | 7/13/2008 |
Q: I'm not trying to figure out an actual problem. I'm trying to figure out the proper formula(s) that ...
A: So I guess the object is going to pull the tree down on top of itself. Or perhaps the object hits ...
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| induction motors as generators | 7/11/2008 |
Q: I am currently working on low speed wind mills. I have read a great deal about induction motors as ...
A: I'll help as much as I can. But it appears that you have studied this topic more than I have. Motor ...
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| transistor | 7/10/2008 |
Q: Ms.Steve Could tell us about the newest and latest applications of transistor? We'd be thankfull.
A: The transistor is used in so many devices I can't possibly know the latest. Your cell phone probably ...
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| RE: Finding the resonant frequency of an object | 7/9/2008 |
Q: Good day Steve! I am Drew from the Philippines. I am an undergraduate BS-ECE student and me and my ...
A: An interesting and important task. There are too many land mines left waiting after hostilities are ...
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| physics | 7/8/2008 |
Q: A bullet of mass 10g traveling horizontally at a speed of 100ms embeds itself in a book of wood of ...
A: This is a problem for the principles of conservation of ___. First you need to use conservation of ...
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| ballast | 7/3/2008 |
Q: My work is quite stressful and my way of de-stressing ( and you may find this weird),is to brouse ...
A: Sorry that it's taken quite a while to get back to you. I haven't found much information about this. ...
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| the moon's gravity | 7/2/2008 |
Q: With the moon's mass 1/80th of the earth's, why is its gravity 1/6th? Thanks
A: It's true that the moon's mass is about 1/80th of Earth's. Newton's equation of universal ...
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| Magnetism and Electricity | 7/1/2008 |
Q: Ok, I understand that electricity creates a magnetic field as it passes through a conduit (wire, ...
A: If the current is an AC current, there are 2 ways that I can describe. One is a transformer. You ...
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| magnetism | 6/30/2008 |
Q: Can you explain why a steady current like DC produces a magnetic field only..what is the link ...
A: Your questions are very basic questions. As physicists discovered phenomena, they then tried to ...
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| Rotation speed | 6/29/2008 |
Q: I'm a woodworker but have a question regrading the fan in my spray room. I'll list the parts I ...
A: You're right about the circumference being involved. If the belt moves 10 cm over the small pulley, ...
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| falling objects | 6/24/2008 |
Q: When a small pebble about the size of a marble, is dropped into an 8 inch cylindrical hole of a ...
A: I assume that "without any affect of air movement" means that there is no air resistance. That means ...
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| 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: I agree with James J. Kovalcin. But a different explanation sometimes helps. So assume you have a ...
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| ROLLERCOASTER PHYSICS | 6/15/2008 |
Q: I am in year 12 and have been asked to construct a model, working rollercoaster. I have built it ...
A: If the P.E.=465,975 J when the rollercoaster is halfway down from the peak, the maximum P.E. (at the ...
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| Hit baseball: accel or de-acccel? | 6/13/2008 |
Q: When a pitched baseball is well hit, does it accelerate from zero (the moment it was hit) for a good ...
A: The baseball will not accelerate toward the outfield unless there is a net force acting on it toward ...
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| iPod | 6/11/2008 |
Q: I have two questions about how iPods work. First of all, could you explain to me (in electrical ...
A: I'm sorry, I don't know. I don't have and haven't used an ipod. I did some searches trying to find a ...
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| Magnet only pushes in ONE direction | 6/10/2008 |
Q: http://www.youtube.com/watch?v=xb8wwkdtz0M Can you explain this ?
A: I see only one thing that might explain why the magnet set near the disk, call that one m1, wouldn't ...
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| units and significant figures | 6/8/2008 |
Q: Sir few very basic questions related to units in meausrement as we hav been introduced to units in ...
A: It's good to avoid starting off unsure of the basics. Statements: 1) It may be just a legend, but ...
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| physics | 6/6/2008 |
Q: time of flight,range of a projectile
A: If you know any 2 of the parameters: time of flight,range of a projectile, and angle of take-off, ...
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| heat | 6/5/2008 |
Q: A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will ...
A: The answer is clearly A. There's no way the bar would shrivel up as much as B,C, or D say (about 1 / ...
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| vectors | 6/4/2008 |
Q: sir i want to know when we find torque = cross product of moment arm (distance of point of ...
A: 1) The valid direction of the vector of a straight line force is obvious. It's the direction the ...
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| Physics Lab- how to name controls and variables | 6/3/2008 |
Q: I'm designing a lab that talks about "energy relationships". I have created a lab, but I don't know ...
A: I'm a little troubled by the setup of the experiment. I'll just point out some things and then go ...
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| Energy from Hydrolysis | 6/2/2008 |
Q: I would like to know the energy return from hydrolysis. Let's say a person uses 100 kilowatts of ...
A: According to Wikipedia (http://en.wikipedia.org/wiki/Electrolysis_of_water), the theoretical maximum ...
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| center of mass of the body | 6/1/2008 |
Q: In which direction would the center of mass of the body migrate if the arms were raised overhead? ...
A: If some of the mass of the body is elevated, the center of mass (c.o.m.) will be elevated. If some ...
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| online lectures. | 5/30/2008 |
Q: im doing bsc physics major through correspondence. can you suggest me some "online video lectures" ...
A: I didn't personally know of any, so I did a yahoo search: ["online lectures" "basic physics"] and ...
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| electricity | 5/29/2008 |
Q: if a resistor wound then it acts like inductor how a single wire show different properties like ...
A: Ampere's Law says that any current produces a magnetic field. The relationship between the current ...
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| Physics, Electricity, Circuits... | 5/27/2008 |
Q: What's the diff. between a light bulb connected to the positive terminal of a battery and one ...
A: If I have this right, in either case you have some wire, a switch, an ammeter, and a lamp between ...
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| Evaporation Rate | 5/22/2008 |
Q: What molecular variables do you think affect the evaporation rates of liquids?
A: I have several web sites for you to look at. ...
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| force | 5/21/2008 |
Q: Why is it difficult to walk on a marshy land ? please explain
A: You are doing a certain amount of work as you walk. When you walk in a marsh or on a sandy beach, ...
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| Tesla Coil Build | 5/20/2008 |
Q: Dr. Johnson, I'm planning to build a tesla coil as a nice side project over this summer, and seeing ...
A: It's good that you want to find resources to learn as much as you can. It is a dangerous goal. I ...
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| Egg Drop | 5/18/2008 |
Q: I am doing a science project for school (high school) and for some reason I have to define some ...
A: Sorry, I don't know "disturbing the forces". It sounds like a term from the Star Wars movies. It's ...
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| electrical science | 5/16/2008 |
Q: draw one cycle of an a.c. waveform having a peak value of 325v at 50Hz. From the waveform, determine ...
A: Draw a vertical axis at the left of your drawing space, label that "Voltage" with +350 at the top ...
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| 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: Unfortunately your question got garbled somewhat. I got "˝ kx2 = mg h". I think that box in ...
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| 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: Yes this can be confusing. When you hold the chalk, all of the weight of the chalk is exerted on ...
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| conversion | 5/8/2008 |
Q: how do i convert kilogram/meter to Newton/meter?
A: Kilograms are the unit of mass and Newtons are the unit of force and weight. The relationship ...
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| Current versus Voltage | 5/4/2008 |
Q: I'm trying to get my head around the idea of current versus voltage. By my way of thinking the ...
A: Followup at the end. Your ideas are pretty close to true, maybe if I just add a few things it'll ...
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| voltage | 5/1/2008 |
Q: 1. A circular coil of diameter 8 cm and consisting of 1000 turns is rotated in a 0.2 Tesla ...
A: 1a. The magnetic flux density, B = 0.2 tesla, which is equivalent to 0.2 weber per square meter. ...
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| Momentum and spring constant | 4/30/2008 |
Q: i need help! a block of mass m is attached to the end of a horizontally mounted spring of ...
A: a) When displaced by xo, there is a spring potential energy spe = (1/2)*k*(xo)^2 When the block ...
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| Physics Misconceptions | 4/28/2008 |
Q: Physics has never come intuitively for me. I somehow make little mistakes along the way that give me ...
A: To help your intuition: If a relationship doesn't make sense, try to simplify it, or perhaps think ...
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| Physics Project Ideas | 4/27/2008 |
Q: I am a senior in high school and in my physics class we have been assigned an end of the year ...
A: I think your choice should be influenced by the interest you had in the various topics that you ...
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| resonant frequency | 4/26/2008 |
Q: I just want to ask how can i construct a material of a specific resonant frequency? What are the ...
A: During my electrical engineering career it was the mechanical engineers that were given the task of ...
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| Electrostatiacs | 4/25/2008 |
Q: When we connect the positive terminal of the battery to the ground, then what happen to van de graff ...
A: If the Van de Graaff generator you're asking about is like the one on this webpage, ...
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| pulley systems | 4/23/2008 |
Q: for a horizontal pulley problem involving friction where you have a block c sitting on top of block ...
A: OK, the way you have explained it, the task is to increase the friction between block a and the ...
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| egg Drop | 4/21/2008 |
Q: i have to do the egg drop project for physics. My rules are i can only use 10 sheets or standardize ...
A: I never did one of these when I was in school. Now I'm surprised to see how many variations on the ...
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| pulley systems | 4/20/2008 |
Q: for a horizontal pulley problem involving friction where you have a block c sitting on top of block ...
A: I'm not sure I've got the picture right. The tension on the string pulling on block a is the weight ...
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| Egg Drop | 4/19/2008 |
Q: How would speed, velocity and acceleration affect my egg and it's container for my egg drop?
A: Speed, and velocity; and the increases in velocity acceleration causes, are involved in the kinetic ...
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| egg drop | 4/18/2008 |
Q: For my egg drop project I am supposed to explain how Newton's Laws of motion affect my prototype
A: If you ignore air resistance during the fall, the only force acting on the egg is its weight. ...
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| force | 4/17/2008 |
Q: Sir These are questions related to force 1) Any body falling under gravity accelerates with the ...
A: 1) You could add an external force. A body can accelerate at a higher rate than 9.8 m/s^2, if it has ...
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| Applied Mathematics | 4/16/2008 |
Q: What effect, if any, would the coriolis effect have upon a parachute descent? The initial ...
A: Very little affect. The Coriolis effect is small to begin with. And a parachutist looses all the ...
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| Tangent question | 4/15/2008 |
Q: tangent to y = x^2 when x = 2. Can you tell me which of the following is the correct answer? ...
A: I'm sorry that this reply has taken me so long. I usually do better. The desired tangent to the ...
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| frequency/waves | 4/14/2008 |
Q: 4. A bat, moving at 5.00 m/s is chasing a flying insect. If the bat emits a 40.0 kHz chirp and ...
A: 4. The formula describing the Doppler Effect when both source and observer are moving with respect ...
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| Physics | 4/11/2008 |
Q: An elevator weighing 2.00x10^5N is supported by a steel cable. What is the tension in the cable ...
A: The elevator's weight can be written as W = 2.00x10^5N = m*g So its mass is m = 2.00x10^5N / g I ...
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| Sound Waves | 4/10/2008 |
Q: 1) A string of mass 4 grams and length of 2.4 meters is forced to vibrate at a frequency of 120 Hz. ...
A: 1a) The nodes are the points of the string that are not vibrating. Or you can say the points of the ...
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| relative vector | 4/7/2008 |
Q: sIR I have not faced so much difficulty in understanding any topic as i am facing in understanding ...
A: I found the site you referred me to have a good discussion. But I might have presented the vector ...
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| Physics | 4/5/2008 |
Q: Abullet with a mass of 6.00g is fired through a block of wood on a frictionless surface. The ...
A: Momentum must be conserved in collisions. (That's true whether it's an elastic or inelastic ...
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| final equilibrium | 4/4/2008 |
Q: A track star goes into jump at 12m/s and launches at 20.0 degrees above the horizontal. What is the ...
A: The problem is simpler because both components have the same specific heat. I'll work the problem 2 ...
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| Questiom\n | 4/3/2008 |
Q: If a 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power company ...
A: I think you could have figured that out just by just looking at the units. Let me help you see how. ...
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| Science | 4/2/2008 |
Q: A 10 ton truck is going down the highway at 60 miles per hour. It comes to a complete stop in 7 ...
A: Boy, I dislike physics problems given in pounds and miles. And then they give the mass of the rotors ...
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| Electrical voltage | 4/1/2008 |
Q: We take it for granted that the frequency is 60Hz and the voltage levels for transmission and ...
A: Much of the answer is historical. Sticking to a choice because the investments already made are ...
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| A- physics (Electricity) | 3/31/2008 |
Q: Please Sir could you kindly help me the theory behind the topic and diagram where necessary "AC to ...
A: I think you are asking about a power system like (in principle) the old one described in this web ...
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| Magnetism | 3/30/2008 |
Q: I would like to know about magnetic screening
A: I'm not sure which application you're interested in. Consider the following sites. ...
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| Electromagnetism | 3/27/2008 |
Q: If a car made of iron and steel moves over a wide closed loop of wire embedded in a road surface, ...
A: Yes I believe it will alter the earth's magnetic field at that location. Iron introduced into a ...
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| force | 3/25/2008 |
Q: sir thank you first for replying mu previous questions on force sorry for bugging you but since ...
A: 1) Your question is typical of frequent confusion over just what Newton's 3rd means. I have seen a ...
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| please help! | 3/24/2008 |
Q: 1.An athlete with a mass of 95 kg is found to have an apparent mass of 7.92 kg when submerged in ...
A: First, I'm on a mission: Teaching people how to show squared and other powers in computer text. ...
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| force | 3/23/2008 |
Q: sir few questions on force and force of gravity 1) Why does inertia of an object depend on mass ...
A: 1) It's mass that makes an object resistant to changing its velocity. Being resistant to changing ...
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| simple generator | 3/22/2008 |
Q: I am attempting to make a simple generator. Here's what I've done so far. I have coiled 3 small ...
A: I'm almost sure, but just to be 100% sure, you mean you taped it with electrical tape? OK, good. ...
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| Rotational dynamics toppling&sliding | 3/19/2008 |
Q: Broadly explain toppling and sliding with good number of examples involving calculations. Thanks.
A: I need a more clear explanation of what you're asking about. Please send a followup. I guess I could ...
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| miscellaneous | 3/18/2008 |
Q: sir few questions as i hav just appeared my class X physics exams and i am doubtful about few ...
A: 1) It is good that you watch the units. They will often give you a clue if things are going wrong, ...
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| electricity | 3/16/2008 |
Q: sir i hav one question , its really urgent. sorry for asking you this question last moment and ...
A: OK, I hope this is quick enough after you posted the question. Your book is probably correct. Have ...
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| acceleration of gravity | 3/11/2008 |
Q: it would be really nice if you solved this before March 19,2008! OK.....According to the ...
A: I hope you intend for me to ignore air resistance. I don't know whether air would have more affect ...
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| thin film resistors | 3/10/2008 |
Q: why would it be better to use a thin metal film resistor as opposed to a wire wound resistor for an ...
A: The wire wound resistor can have some inductance. Although some of them are built to minimize the ...
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| dimmer for light bulbs | 3/7/2008 |
Q: I would like to know what happens when you attach a 100 watt or a 300 watt light bulb to a dimmer ...
A: There are different types of dimmers. The older, more crude type puts an adjustable resistor in ...
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| Physics | 3/6/2008 |
Q: What is the cause of Earth's Gravity. How is it produce.
A: Man's understanding of Gravity has improved throughout time. The first fairly good understanding was ...
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| opposite forces pulling a boat | 3/5/2008 |
Q: How do you determine the opposite forces acting upon a boat in two opposite directions? The boat is ...
A: I have to make some guesses here about what you mean. Here's what I will assume you meant: How do ...
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| modern physics | 3/1/2008 |
Q: how can we understand from michelson and morely expriment that the speed of light is constant?
A: The Michelson and Morely experiment wasn't designed to prove that c is a constant. And in fact it ...
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| physics | 2/29/2008 |
Q: The space shuttle is in a 250-mile-high orbit. What are the shuttle’s orbital period, in minutes, ...
A: The key to figuring this out is to understand centripetal acceleration. Newton's 1st Law says that ...
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| Chareable batteries | 2/28/2008 |
Q: How have you been,after a brief sojurn,I am back with this question.I read an article about cell ...
A: Good to hear from you again. Things are good here. The exploding thing is apparently true. It's ...
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| physics newtons third law | 2/27/2008 |
Q: a. How much force does an 80.0 kg astronaut exert on his chair while sitting at rest on the launch ...
A: a. The astronaut exerts his weight on the chair. W = m*g = 80.0 kg*9.8 m/s^2 Additional info: the ...
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| ac dynamo | 2/26/2008 |
Q: sir this is related to ac current generated in ac generator 1) how is the output emf or volatge ...
A: 1) Faraday's Law says that the induced emf equals -1 times the rate of flux change. The way that's ...
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| motion | 2/25/2008 |
Q: what is motion uniformly accelerated?
A: That means that the velocity is increased the same amount each second. For example: Say you're ...
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| vectors | 2/24/2008 |
Q: You are a pilot on an aircraft carrier. You must fly to another aircraft carrier, now 1450 km at 45 ...
A: I'm not sure how to interpret "at 45 degree of your position". I'm going to guess that means it's NE ...
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| force | 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) If you were buying 1/4 kg of peanuts and the scale made an error or 1%, maybe you were gypped out ...
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| Energy | 2/22/2008 |
Q: how are energy and electricity related?
A: It's like the relationship between fruit and apples. Energy comes in many forms. One of the forms ...
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| general physics | 2/21/2008 |
Q: A small ball rolls around a horizontal circle at height y inside a frictionless hemispherical bowl ...
A: This is an interesting question. Too bad the "as shown" you mentioned didn't show anything. But I ...
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| Physical Science | 2/20/2008 |
Q: What are red foxes? Consumers, Herbivores,omnivores,producers,carnivores, and/or photosynthesizers?
A: Wikipedia says that the red fox (the 4 legged fox) is a member of the order Carnivora. But then they ...
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| Centrifuge force against Gravity | 2/18/2008 |
Q: Not to go into too much detail here, but I need some help with my project. I have built a machine ...
A: There's a cable in the top springs that restricts those springs from stretching as far as they would ...
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| Centrifuge force against Gravity | 2/17/2008 |
Q: Not to go into too much detail here, but I need some help with my project. I have built a machine ...
A: That thing really spins doesn't it? I'd hate to be in the way if one of the weights broke loose. I ...
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| 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: Interesting question. I had never studied, or thought hard about, just what flames are. Perhaps my ...
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| energy | 2/14/2008 |
Q: Sir i have few questions. please donot consider these questions as homework questions as i am ...
A: Followup is at the bottom. What you have plotted looks like what you might have plotted in a math ...
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| Tennis Net Tension | 2/13/2008 |
Q: I'm wondering if you could help me with a problem im having. I'm currently mid process of designing ...
A: I'm curious how you determined the force applied when a hard serve hits the net cord head on. Assume ...
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| symmetrical pi attenuators | 2/12/2008 |
Q: When it comes to a schematic for a symmetrical pi attenuator, all I have been able to find is the ...
A: I wasn't sure if the term symmetrical had more than the obvious meaning. So I found the following ...
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| physics | 2/11/2008 |
Q: A 110 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 3.0 N/cm ...
A: a) If it weren't for the spring, the block would continue to increase its speed, therefore also its ...
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| space motion | 2/10/2008 |
Q: In a test of a new missile defense system, a missile is fired on a trajectory that would directly ...
A: The center of mass, COM, of the incoming missile will still land on its original target. So the only ...
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| Acceleration question | 2/6/2008 |
Q: Felix steals for second base running at a speed of 4.20m/s. He slides into second base from a ...
A: When you used the equations d=rt and d/r=t you found the time that it would have taken Felix if he ...
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| kinetic energy | 2/5/2008 |
Q: if a mouse and an elephant both run with the same kinetic energy, can you say which is running ...
A: The equation for kinetic energy is KE = (1/2)*m*v^2 where m is the mass and v is the velocity of the ...
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| SI unit | 2/4/2008 |
Q: sir I am in 9 th grade. I want to ask you a question 1) We are learning SI units, can you tell me , ...
A: 1) Two reasons I can suggest. To continue using units and values for those units that had been ...
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| Current question | 2/3/2008 |
Q: I have a question regarding current through a water layer. The answer that i am getting for this ...
A: I can see 2 traps that might have tripped you up: 1. The units of length need to be made ...
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| Drag Force | 1/30/2008 |
Q: How to calculate the drag force of the human body in the water when you swimming?
A: There may be formulas that try to yield an approximate value. Drag would vary with speed of swimming ...
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| Electricity | 1/26/2008 |
Q: In reference to the electrical feed to a house, one lead is +110 and the other is -110 volts. The ...
A: To say one lead is +110 and the other is -110 volts is an oversimplification. I started out looking ...
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| static electricity | 1/24/2008 |
Q: One question on work and power 1) Which body of the two having power 150W and 200W can do more work? ...
A: Ahh, I see your point. I agree with you, given any task where any amount of work (Joules) is ...
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| static electricity | 1/22/2008 |
Q: One question on work and power 1) Which body of the two having power 150W and 200W can do more work? ...
A: 1) A watt is a J/s. Each second, the 1st body has 150 Joules that it can "spend" doing work. The ...
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| force | 1/20/2008 |
Q: sir i hav been trying to ask you a question but always i found you maxed out for past one week. can ...
A: Sorry that you've had trouble finding me available. I accept only one question a day. At allexperts, ...
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| generators | 1/19/2008 |
Q: I build water wheels and am playing with electric production. I am looking to drive a 60-100 amp ...
A: If you have a load on the alternator that is drawing 60 amps, the power out of the alternattor is ...
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| 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: That sounds like a fun project. Also a bit challenging for the 8th grade. You must be an advanced ...
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| Physis | 1/9/2008 |
Q: what's the best way to do a physics project about Free-Fall?
A: That depends on what you want to learn about Free-Fall. Do you want to verify that falling objects ...
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| electrcity | 1/7/2008 |
Q: sir i hav one doubt regarding a numerical in teh following circuit diagram we hav to find teh ...
A: >why are they connected like this?< Yes, if you are using a number of 1.5 V cells to build a voltage ...
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| Egg Drop Project...Please Answer!!!!!!!! | 1/4/2008 |
Q: I am doing the the egg drop project and i can use any material except bubble wrap and styrofoam. And ...
A: This project has been discussed many times here at allexperts. I went to page ...
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| despersion | 1/3/2008 |
Q: Is despersion of sound is posible like dispersion of light?
A: Dispersion of light is obtained by sending a beam of light through a prism. The beam can be shown to ...
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| question | 1/2/2008 |
Q: if he comes to rest 5.0 m beneath the surface determine the average resistance force exerted on him ...
A: I don't see how this can be worked with the data given. The height the diver dropped from would ...
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| 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: I don't have specific knowledge or data about this so I have to rely on instinct, or what seems ...
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| A/C Current | 12/30/2007 |
Q: I have a very basic question regarding 110 volt a/c current. From what I understand the a/c changes ...
A: >the voltage is always on the hot wire but changes from 120 to 0,back to 120 etc< Well, I need to ...
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| 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: This is well outside my experience and expertise. However I've been working on your question hoping ...
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| Gyroscope | 12/25/2007 |
Q: I want to know how gyroscope works? ,different types of it ,what are related equations?,useful sites ...
A: When I first started work after college (1968), my first assignment was related to gyroscopes. I was ...
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| energy loss of a projectile | 12/23/2007 |
Q: I am submitting two related questions. I am 52 years old, so this is not a kid's homework project, ...
A: Your subject implies that I should consider air resistance. First I'll ignore air resistance. If you ...
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| free energy ??? | 12/22/2007 |
Q: what can be put between two magnets to stop the force
A: One way is to put a lot of distance between them. That probably wouldn't work for whatever you're ...
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| ? | 12/20/2007 |
Q: If an astronaut is in space, is it's mass the same as it is when it's on Earth?
A: Depends on diet. If it eats more than enough to maintain the normal amount of mass, it might get ...
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| sound | 12/19/2007 |
Q: Sir i hav a problem sum which came in my exam I know that the frequency of a string is inversley ...
A: One error I see may be just in the version you wrote up for me about how you worked it: "velcvit of ...
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| physical science | 12/18/2007 |
Q: Can an object have mechanical energy without having momentum?
A: Yes. Two examples: Newton's apple had gravitational potential energy before it broke loose from ...
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| newton's laws | 12/17/2007 |
Q: applications of newton's laws in our daily lives and studie
A: Newton's 1st: When you put your book on your desk, it stays there without moving (even if your desk ...
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| doppler effect | 12/16/2007 |
Q: In doppler effect if the observer and the sours are located at the top of a train that is moving<is ...
A: This was an interesting study. I hadn't thought this through for many years and it took me some time ...
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| Egg Drop Question | 12/13/2007 |
Q: what we now need to do is to determine the minimum time the egg has to stop to survive. What I do ...
A: Knowing the max force that can be applied to the egg and the mass of the egg, you can find the max ...
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| science | 12/12/2007 |
Q: Gas a is composed of diatomic molecules (two atoms to a molecule) of a pure element. Gas B is ...
A: I am sorry that this is late. The equation of state for an ideal gas says that p*V = n*R*T where p ...
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| high voltage electric shock | 12/11/2007 |
Q: can we receive an electric shock from the overhead distribution wires fixed up by the company? if so ...
A: Air is good insulation. If there is an air gap (of more than a few millimeters) between you and the ...
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| Physics | 12/10/2007 |
Q: Can you help me with thisA 70.0kg box is pulled across a frictionless surface by a 300N force at an ...
A: I'm sorry this is late. You need to find the downslope component of the box's weight. Components ...
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| Physics | 12/6/2007 |
Q: we are a groups of physic teachers following a professional development course bewilder happy if you ...
A: A quick answer is that Geophysics is the science of the earth and its environment. Geophysics has ...
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| Newton's Cradle | 12/5/2007 |
Q: When you place a finger in between the middle of the Newton's cradle, somehting strange happends. ...
A: The operation of Newton's cradle requires that the balls be elastic, equal shape, and equal mass. ...
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| light | 12/4/2007 |
Q: I'm not quite sure if your the right person to ask for this question but I was just wondering, ...
A: You are right. Gravity affects light. The effect is that if a light beam passes close to a body with ...
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| bridge jumping impact force into water | 12/3/2007 |
Q: "hello Im a adventure film maker.(www.myspace.com/flyingfatmanproductions) I have made a movie about ...
A: My pleasure. That was a fun question. Bear in mind that pressure is a significant factor in the ...
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| bridge jumping impact force into water | 12/1/2007 |
Q: "hello Im a adventure film maker.(www.myspace.com/flyingfatmanproductions) I have made a movie about ...
A: I have to disagree with your velocity figure. In free-fall, if you can ignore air resistance, the ...
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| physics | 11/30/2007 |
Q: Why is there no net force in constant speed Please provide a different answer than just the simple ...
A: The easy answer is that if the net force were non-zero, then that net force would cause ...
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| force and energy | 11/25/2007 |
Q: have two questions whose answers i am not geting. can yoy please help me. 1) The momentum of a body ...
A: The force of 447.2 N was applied only for the 0.5 s period. That force was applied by the earth ...
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| Questions about magnetic analogs of electricity. | 11/24/2007 |
Q: Dielectric strength and ohm [electric resistance] are electric entities. What are their magnetic ...
A: Dielectric strength and electric resistance are both a measure of the ability of the substance to ...
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| electricity | 11/23/2007 |
Q: if a point charge is released in a non uniform electric field with field line in the same direction ...
A: Just to be clear, I'm going to assume you mean that it's the original velocity of the charge that is ...
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| 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: The volume of water passing through any and all cross sections in a second have to be equal. That's ...
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| force and energy | 11/20/2007 |
Q: have two questions whose answers i am not geting. can yoy please help me. 1) The momentum of a body ...
A: Well, I'll show the method and equations. Giving the answer is something I try to avoid. I prefer to ...
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| 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: Magnetism is present in an area if there is some force that tends to make a test magnet align in a ...
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| Explain pls. | 11/14/2007 |
Q: Explain connection of circuit to physics?
A: Physics has several fields. Electricity is one of them. Physicists study the phenomena and determine ...
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| angular momentum | 11/13/2007 |
Q: We have a project to do in physics (first year university) about angular momentum. That is the ...
A: I see why you say that hurricane doesn't have mass. Before the hurricane came to a particular place, ...
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| Physics | 11/12/2007 |
Q: Hey Steve, How have you been? I can lift a bag off the floor,a weightlifter can lift more than his ...
A: Some people like excitement while on vacation. Roller coasters, scary movies ... natural disasters ...
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| ac theory | 11/11/2007 |
Q: im after some advice about the foolowing question. a resistor of 250 ohms is conected in series ...
A: Yes you need to come up with net impedance. It's not as simple as 100 / 250 = 0.4 amps. That's what ...
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| physics | 11/10/2007 |
Q: Suppose air friction acting on a car increase as kv^2. What is engine power needed to keep the car ...
A: Power is the rate that work is being done P = W/t where the amount of work W is done in time t. ...
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| centrifugal force | 11/8/2007 |
Q: why don't we experience centrifugal force due to the rotation of the earth?
A: I prefer to talk about centripetal force. Centrifugal force is somewhat controversial. In the ...
|
| Simple Machine Design Question | 11/7/2007 |
Q: I'm trying to figure out how to design a simple machine with the following specifications: There is ...
A: The downslope force due to the weight of mass M2 being on the slope is Fds = M2*g*sin20 The static ...
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| hello | 11/6/2007 |
Q: you exercised by working for 15 min. on a treadmil A). what is you velocity relative to the trail ...
A: A) Trail, do you mean the tread of the treadmill? If so, your velocity relative to the tread is the ...
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| Physics | 11/5/2007 |
Q: Hey Steve, How have you been? I can lift a bag off the floor,a weightlifter can lift more than his ...
A: Let's start by putting you in that cage! If you pull on the rope, you will first start climbing the ...
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| electromagnet dc motor | 11/4/2007 |
Q: How should i build a dc motor, if i want two electromagnets instead of permanent magnets, and i want ...
A: I don't have personal experience from my career on motors. So I had to do some research. Yes you can ...
|
| 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: According to http://en.wikipedia.org/wiki/Wind_resistance, the force of wind resistance, (or more ...
|
| density question | 10/31/2007 |
Q: I need to know how the density of an object will be affected if the volume of an object is ...
A: Density is mass (sometimes weight) divided by volume. Density = mass / volume The units are ...
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| Taking Off ; Newtonian Mechanics | 10/25/2007 |
Q: I am uncertain what formula I should use to solve this question. Could you help me out? " A jumbo ...
A: You know the original velocity, Vo, the final velocity, Vf, and the distance, s (sometimes the ...
|
| Continuity Equation? | 10/24/2007 |
Q: Use the continuity equation to explain how jet engines provide a forward thrust for an airplane. My ...
A: I didn't know of (or didn't remember) the Continuity Equations either. A search yielded several ...
|
| Pondering science project | 10/23/2007 |
Q: If you place different weights on a skateboard and roll them down an inclined plane, gravity will ...
A: "Rolled farther" ... I assume you are talking about the skateboard rolling farther on the level ...
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| physics | 10/21/2007 |
Q: when alternating current flows through an inductor, voltage leads current by phase angle 90 ...
A: The affect of inductance is to resist any change of the current flowing through it. When the voltage ...
|
| Newton's law of cooling | 10/20/2007 |
Q: A cup of coffee is taken from a coffeemarker at 96C and left on the office table. In the ...
A: Newton's law of cooling is an approximation which holds well if the cooling body can be assumed to ...
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| forces on 3 connnected blocks | 10/19/2007 |
Q: There are three blocks on a frictionless surface. Block one (1.0kg)is connected to block 3 (4.5 kg) ...
A: The 3 blocks (total mass = m123) are all connected in some way, so all have acceleration of the same ...
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| SUVAT | 10/18/2007 |
Q: I am struggling to rearrange the equation s=ut+(at^2)/2 to find time. please help!
A: I assume that you know s, u, and a. If so, this will become a quadratic equation. I imagine ...
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| physics | 10/17/2007 |
Q: A 1.5 kg ball and a 2.2 kg ball are connected by a 1.0 m long rigid, massless rod. The rod is ...
A: I'm sure you could do this if it were a mass sliding on a table. What friction would bring it to a ...
|
| clockwise or counterclockwise? | 10/16/2007 |
Q: I've just started learning about the torque, so I'm still confused about some fundamental stuff. I ...
A: I think I can best explain if I set up a situation and analyze it. Consider an uniform steel bar, 3 ...
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| heat | 10/14/2007 |
Q: Can you explain me the following questions 1) Why does the melting point of ice decreases with ...
A: I did not know much about either topic so I searched the web. 1) This collection of websites ...
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| kinematics | 10/13/2007 |
Q: A boy standing on the ground 20m from a building throws a snowball into a window 15m above the ...
A: I've added a followup at the bottom. Go there to pick up a modification of my answer. Since it went ...
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| physics | 10/10/2007 |
Q: I have been trying these two problems with no luck any help is appreciated Thank you 1. A 60 kg ...
A: 1. Since the skydiver is traveling at constant speed, there is no net force acting. The skydiver's ...
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| electric toothbrushes | 10/9/2007 |
Q: How does the charger for my electric toothbrush work? It sits in a stand to get charged, but there ...
A: You're right, it's the phenomenon of electromagnetic induction. DON'T DO ANY OF THESE STEPS without ...
|
| Physics Tension Help? | 10/8/2007 |
Q: I have a question regarding this problem. I have tried using the formula mv^2/r but is that not ...
A: It's true that you should use the formula mv^2/r. That is the centripetal force that is required to ...
|
| about pressure and electricity | 10/7/2007 |
Q: i wanted to ask you wether we can convert applied force into electricity or not if yes how please ...
A: Yes we can. If we can include torque (which is a force applied to a lever arm to cause rotation) in ...
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| Force and accelerations - Newton | 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: So if I have it pictured right, I guess block A could just sit on the table and block B could go up ...
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| Heat | 10/5/2007 |
Q: A temperature of 200 F is equivalent to approximately A. 37.8 C. B. 93.3 C. C. 232 C. D. 840 C.
A: I'm sure you know a few facts that you could use to answer this yourself. Let me remind you of some ...
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| Projectile | 10/4/2007 |
Q: The lob in tennis is an effective tactic when your opponent is near the net. I consists of lofting ...
A: I have to assume that the lob is launched essentially at zero altitude. I'm going to give you advice ...
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| velocity | 10/3/2007 |
Q: I've been trying to find the equation for the velocity of an object dropped from a certain height, ...
A: If you have an expression for position, x, versus time, t, the 1st derivative (dx/dt) is velocity, ...
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| Problem about Projectile Motion | 10/2/2007 |
Q: I need help understanding this problem specially the part where I have to calculate the range ...
A: You can separate the initial velocity of 65.2 m/s into horizontal and vertical components. Vix = ...
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| physics | 9/30/2007 |
Q: when you are standing on the ground. how much upward force is exerted on you by the earth?why does ...
A: You are pushing down on the Earth with a force equal to your weight. (This is the same force you ...
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| acceleration and tension | 9/27/2007 |
Q: A block is resting on a horizontal table and has a weight of 422 N. It is connected to a block ...
A: The 2 blocks will undergo acceleration of the same magnitude since they are tied together. #1 goes ...
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| Elelctricity and Electronics | 9/26/2007 |
Q: first I would I to say thank you if you can help I've been struggling with this lesson. 1. ...
A: I disagree with several of your answers. I think you need to hit the book. I considered refusing, ...
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| electrical resistance in wires | 9/24/2007 |
Q: 1 what effect does connecting an ammeter and voltmeter to a circiut have on the experimantal ...
A: 1 Often in scientific observations, the method of making the observation changes the behavior. A ...
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| voltage drop | 9/23/2007 |
Q: I am trying to find out the p.d. accross a resistor of 250 ohms and a inductor of 1.5 H. Both ...
A: As a guy who worked in electronic labs for 32 years, I can say that "potential difference" and ...
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| Physics Help Please | 9/20/2007 |
Q: I have started working on this problem and know that the moon rock will fall towards the moon and ...
A: Some data first: Radius of Earth = 6.371*10^3 km. Mass of Earth = 5.983*10^24 kg Radius of Moon = ...
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| physic | 9/18/2007 |
Q: can a rope ever be 100% horizontal?
A: Well, not unless it's laying on a 100% horizontal table!! I assume you mean it's stretched out ...
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| Physics stopping distance | 9/16/2007 |
Q: The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m , including the ...
A: You need to analyze the ability of the brakes. So you should subtract the distance traveled during ...
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| fuse | 9/15/2007 |
Q: i have a question regarding the electric fuse. An electric currentof rating 3Kw,250V.I want to know ...
A: The heating element in the electric kettle will be primarily pure resistive. Power in that case is ...
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| physics problem | 9/14/2007 |
Q: I have tried this problem and cannot figure it out. Any help would be greatly appreciated! Thank ...
A: Since the acceleration is perpendicular to the original eastward velocity, the eastward velocity ...
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| Electrical circuits | 9/11/2007 |
Q: Why would it be better to use the variable resistor rather than the potentiometer?
A: I generally use the terms interchangeably and generally abbreviate to "pot". But there is a ...
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| Torque on a rotating drillstring | 9/9/2007 |
Q: Please Help - I am stuck on this one. How do I calculate off-bottom and on-bottom torque on a ...
A: I screwed up. I prepared an answer and must have fumbled the process of sending it out. I just now ...
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| Torque on a rotating drillstring | 9/7/2007 |
Q: Please Help - I am stuck on this one. How do I calculate off-bottom and on-bottom torque on a ...
A: Sorry, I'm going to have to ask you for more information. I didn't know what a drillstring was so I ...
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| Waves | 9/6/2007 |
Q: 1)What is the property of a Transverse wave that allows it to travel thru a vacuum as opposed to a ...
A: 1) Not all transverse waves can go thru a vacuum. The wave on a violin string is transverse, but it ...
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| Physics | 9/4/2007 |
Q: I am having trouble understanding what to do with the information given in the following equations: ...
A: Nothing is said about wind resistance in these questions so you should assume that you are supposed ...
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| Wine | 9/3/2007 |
Q: You will like this one :) I attended a wine appreciation talk recently and was told that the ...
A: I didn't know why it was there. I was just vaguely aware that there was a dimple at the bottom of ...
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| Physical Science | 9/2/2007 |
Q: What Is Simple Machine and Complex Machine ? I need some examples of Simple Machines, and Complex ...
A: The 1st of the websites below gives definitions. The definition of complex machine isn't as clear as ...
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| stressed with this question | 8/31/2007 |
Q: .. ok it says : instructions for finding buried gold, go 83.9 paces at 188 degrees, turn to ...
A: Sorry for this tardy response, it's been a busy week-end. >"between the limits of -180 degrees and ...
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| graphing problem | 8/30/2007 |
Q: How do I go about drawing a position versus time graph for this problem? A police car is at rest ...
A: I'm going to start out using equations, then maybe we'll have a function to graph. The speeder is ...
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| liquid pressure | 8/29/2007 |
Q: Sir i have few questions related to pressure in iquids I am showing three diagrams , i hope it ...
A: The figures show different size bases for each. And that's OK, water at the bottom of a 10 meter ...
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| MOTION | 8/28/2007 |
Q: TWO BOATS 'A' AND 'B' MOVE AWAY FROM BUOY ANCHORED AT THE MIDDLE OF A RIVER ALONG MUTUALLY ...
A: Yes, that's what 'N' TIMES GREATER means. If the river current is 1 m/s, and N is 3, the boat speed ...
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| mechanics | 8/26/2007 |
Q: I want to ask this question. A chain of mass M and length L held vertical by fixing its end to a ...
A: Let's call the point in the chain that is a length y from the support, point Y. Since there is no ...
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| Physics(Projectile motion) | 8/24/2007 |
Q: Two guns are pointed at each other,one upwards at an angle of 30 degree & the other at the same ...
A: At the muzzle velocities involved, the time is going to be very short. Therefore the distance the ...
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| bulb | 8/23/2007 |
Q: why is a bulb filled with inert gas? I know that it deposits the evaporated tungsten back but HOw? ...
A: I'll explain briefly, but the links below do a complete job of discussing the topics. >inert gas ...
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| fluid dynamics | 8/22/2007 |
Q: Why canals posses 'V' shaped cross-section instead of 'U' shaped cross-section?
A: I'm afraid I haven't been able to confirm that V shapes are common. Quoting from ...
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| Electromagnetic Field | 8/21/2007 |
Q: How are you?I am doing a course in electromagnetics.I have a question relating to transmission ...
A: Good to hear from you again -- I'm fine thanks, hope you are doing well too. I feel I need to ...
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| Electric fields | 8/20/2007 |
Q: based on a magnet [or something with a magnetic field] passing thru a coil, which generates a ...
A: >field oscillates from zero to its maximum That would be effective. But other changes in the field ...
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| Electric fields | 8/19/2007 |
Q: based on a magnet [or something with a magnetic field] passing thru a coil, which generates a ...
A: This process is called induction. The formula for the induced emf e (this should really be an ...
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| Suplemontry quatites | 8/18/2007 |
Q: In some books I found that radian and stradian are categorize into third type of quantities known as ...
A: The Systeme International d’unites (SI) conference decided on 7 fundamental units. Combinations of ...
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| voltage fluctuation | 8/17/2007 |
Q: 1) IF i connect a voltmeter between the socket[neutral and live] at my home the voltage shown is not ...
A: Sorry I missed your time target. I didn't read this until morning my time. 1) Ohm's Law says that V ...
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| linera and rotational motion | 8/16/2007 |
Q: if i have a roller (cylinder, pencil)on the table a I move it by rolling my ruler over the top of it ...
A: Look first at the pencil with respect to the table. You can leave the ruler out of it for now. If ...
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| Physics reason for drive on left or right | 8/12/2007 |
Q: I would like to know which way is more sensible in terms of physics that driving on the left of the ...
A: I don't think I'm going to lean either way. The Coriolis effect is weak and would have the opposite ...
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| 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: Regarding your 1st q, it's better to think in terms of electric energy. (The electrons still have ...
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| electricity | 8/2/2007 |
Q: i want to know that the current coming to house is alternating current. now there are three wires ...
A: Yes, the current (electrical power) coming to your house is AC. It's more proper to say that the ...
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| help with this calculation | 8/1/2007 |
Q: This question was sent to you recently; I received an answer from another source; do you agree with ...
A: I can agree with that other answer if I use those assumptions. You didn't say anything about ...
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| electricity | 7/27/2007 |
Q: why is the resistance of the bulb filament kept og very high resistance? I know that in a bulb, the ...
A: Consider a 100 Watt bulb intended for 110 Volt power. Voltage (V) is the force that causes charges ...
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| Huygens double slit exp | 7/26/2007 |
Q: If I have an 11kv power line and put a copper mesh (shaped like a metal fence ) a few feet under ...
A: I may be badly misunderstanding your questions. But let me proceed. For an induction of current in ...
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| Forced collision | 7/24/2007 |
Q: When two freely moving masses collide the outcome is easily determined. What happens when the first ...
A: Hmmm, that's a good one. Let's limit this to collisions in one dimension. We have collision formulas ...
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| resistance | 7/23/2007 |
Q: 1)why does the internal resistance of a battery decrease with increase in the temperature? because ...
A: I think the answer to all 3 parts is efficiency of the chemical action in the cell. 1) I wasn't ...
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| Huygens double slit exp | 7/22/2007 |
Q: If I have an 11kv power line and put a copper mesh (shaped like a metal fence ) a few feet under ...
A: (followup below) The main reason I'm writing right now is to ask for time to come up with a better ...
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| motion | 7/21/2007 |
Q: A ball is thrown vertically upwards from the ground with an initial velocity of 50m/s.What is the ...
A: After being thrown up at original (or initial) velocity Vo, the ball is decelerating at g = -9.8 ...
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| water_motion | 7/19/2007 |
Q: I have a curious question.Imagine a bullet was projected from a still helicopter (straight down, in ...
A: The bullet arrives with high speed at the surface of the water. It is suddenly subjected to a large ...
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| electricity | 7/18/2007 |
Q: helo sir I was reading the chapter on electric potential. Now the elctric potential in all books is ...
A: Well it turns out that my book defines potential differently. Paraphrasing slightly what it says: ...
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| electricity | 7/16/2007 |
Q: sir i hav few questions on electricity 1) why does a thin wire offer more resistance to current than ...
A: 1) A wire contains many free electrons moving randomly around in a disorganized manner. When you ...
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| 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: Followup: While I was waking up this morning my mind was bouncing form one topic to another and ...
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| physics help | 7/14/2007 |
Q: (1) A projectile fired from a gun has initial horizontal and vertical components of velocity equal ...
A: This question tests your understanding of concepts. Gravity acts vertically. The projectile starts ...
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| physics | 7/13/2007 |
Q: The density of ercury is 1.36 x 10^4 kg/m^3. What is the mass of a 4.00x 10^-4-m^3 sample of ...
A: The formula for density is D = M/V where D is density in kg/m^3, M is mass in kg, and V is volume in ...
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| 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: It's true that this isn't my field and I don't often think about acoustics, but I can get my mind to ...
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| Hi Steve | 7/10/2007 |
Q: Its me again with a follow up question on my earlier question ref air pressure. one atmosphere at ...
A: Yes, one atmosphere at sea level is developed the way you describe. And I agree, the weight of the ...
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| fluid pressure | 7/7/2007 |
Q: why pressure inside a fluid is same in all direction?It's due to gravitaion but it's only downwards.
A: Consider a modification to a teapot. Remove the lid and build a cylindrical 3 meter vertical ...
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| Physics | 7/4/2007 |
Q: I refer to the experiment where you fill a glass to the brim with water,then place a piece of thick ...
A: I tried this out (got quite wet) to study the variables. I don't think I had the right type of ...
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| 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: It looks like "Physics for Future Presidents" meets your needs for an overview of physics quite ...
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| AC POWER | 6/30/2007 |
Q: In AC RLC circuits the apparent power S is VI and the real power is VI cos theta and reactive power ...
A: Perhaps it's hard for me since I don't know the context in the texts you have found give the ...
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| Electricity | 6/29/2007 |
Q: Hey I have been working as a land surveyor for a while and we are currently on a project under a ...
A: I disagree with your statement that you need a complete circuit in order to generate electricity. ...
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| AC POWER | 6/27/2007 |
Q: In AC RLC circuits the apparent power S is VI and the real power is VI cos theta and reactive power ...
A: The question on apparent power made me dig. Thank you for the challenge. I think this website will ...
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| physics- average force | 6/26/2007 |
Q: what is the average force required of the brakes in a 1200kg car in order to come to rest from ...
A: In order to come to rest, Vf = 0, from original velocity Vo = 60,000 m/3600s in a distance s = 150m, ...
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| About Newton's 3rd law | 6/25/2007 |
Q: As u know that action and reactions are equal and opposite and also act on two DIFFERENT bodies!! ...
A: I agree, that wasn't one of my best answers. Let me try again. Newton's 3rd is often misunderstood. ...
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| Question about capacity of telephone lines | 6/24/2007 |
Q: I am on reading a article about Loading Coil on a telephone line . It is used to extend ...
A: The website you referenced says "Plain old telephone systems (POTS) telephone line consits of one ...
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| reply soon... | 6/21/2007 |
Q: my Q is AC power supply is provided to our homes from grid station, but there are many home ...
A: One of your home appliances is your computer. (Also radio, TV, cordless phone, microwave oven ...) ...
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| Motion | 6/20/2007 |
Q: An object is pushed along a rough horizontal surface and released. It slides for 10.0s before coming ...
A: The part of the slide that we know most about is the last 1.0 s of the slide. Let's analyze that ...
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| Pendulum Damping | 6/19/2007 |
Q: I found from the internet that the equation for decay in the amplitude of a swinging pendulum is :- ...
A: So in the hypothesized formula, I believe (if the parentheses haven't overwhelmed me) you could say ...
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| electricityandelectronics | 6/17/2007 |
Q: electrons are emitted from a conductor when the conductor is
A: I found several websites that should help you with this. ...
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| Pendulum Damping | 6/13/2007 |
Q: I found from the internet that the equation for decay in the amplitude of a swinging pendulum is :- ...
A: I'm sorry it took me some time to reply. But it's a good thing I didn't send my initial reaction to ...
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| Snap and Clap | 6/12/2007 |
Q: What causes the sound when fingers snap or hands clapping?How different is that from the rumbling ...
A: This is an interesting question. When things are quiet, the pressure of the air around us is pretty ...
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| Electromagmetic shielding | 6/11/2007 |
Q: My friend is a medical doctor.He prefers to sleep on a mat on the floor as he has problems with his ...
A: Non-ionizing radiation is believed to be harmless when the intensity is below the level of heating. ...
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| velocity of microwaves | 6/10/2007 |
Q: what is the velocity of infrared microwaves
A: In free space, all electromagnetic waves travel at c = 3.00*10^8 m/s. Perhaps you meant to ask ...
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| Induction | 6/9/2007 |
Q: I have been told by some electrical people that a human can only produce one kilowatt per hour ...
A: Sorry, but the quick answer is "No". I'm going to try to explain. I hope you have ridden a bicycle ...
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| Baloons | 6/8/2007 |
Q: My daughter asked me yesterday after her helium baloon flew off..how high will it go?
A: I won't be able to give you an altitude with great confidence. I can say (assuming no up/down air ...
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| questions about physics (heat) | 6/7/2007 |
Q: 1. The transmission of heat requiring the movement of a liquid or a gas is A. conduction. ...
A: I can help you with some of them, but I'm not an auto mechanic or refrigeration technician. Surely ...
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| plzz reply soon | 6/5/2007 |
Q: What will be the direction of electric field in each of following circumstances: 1.in the middle of ...
A: 1. E=F/qo where E and F are vectors. Direction of electric field can be determined by thinking of ...
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| Mechanics | 5/31/2007 |
Q: Why a person bends in a downward direction while lifting heavy load?
A: Well I guess it's so that if the person graps hold of the heavy load while bent over, then when ...
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| Physics | 5/30/2007 |
Q: 1. T F A scientific fact is an educated guess. 2. T F Even if evidence is found which ...
A: 1. We start with an educated guess which we call a hypothesis. After several studies and/or tests ...
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| waves | 5/29/2007 |
Q: whats the effect of electromagnatic waves on the human brain?
A: I don't really know. There have been many articles by experts and pseudo-experts. On this topic, I ...
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| Force of Drag across a Moving Body | 5/27/2007 |
Q: I'm trying to determine the force of drag across a moving body. Can you provide me with a general ...
A: I have a number of wegsites for you to look at. I believe they will answer your questions. drag ...
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| theory of relativity | 5/26/2007 |
Q: Tell any practical application of special theory of relativity
A: If you mean practical from the viewpoint of the banker, History teacher, or medical doctor, I think ...
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| Question about Sound- Physics | 5/23/2007 |
Q: Sir, if frequency of two sounds are equal can u say that u r same? i want to know the parameters ...
A: Instead of using the question method, there's another way to send positive feedback. As you read ...
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| plzzz reply me soon..... | 5/22/2007 |
Q: questions are: Q1. A car goes along a section of road shaped like the letter S. The speed of the car ...
A: I haven't replied to all of them. The ones towards the top were easy. But I spent some time thinking ...
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| electricity | 5/21/2007 |
Q: Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles ...
A: What I was thinking of was the way the charges are attached. The charges are at the vertices. If ...
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| Question about Sound- Physics | 5/20/2007 |
Q: Sir, if frequency of two sounds are equal can u say that u r same? i want to know the parameters ...
A: Ahh, sorry that I misunderstood. First, about the Doppler effect: to reduce the amount of the ...
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| electricity | 5/19/2007 |
Q: Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles ...
A: I'm going to assume you intended to say "The resultant <force> on the charged <particle> at A has ...
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| Question about Sound- Physics | 5/17/2007 |
Q: Sir, if frequency of two sounds are equal can u say that u r same? i want to know the parameters ...
A: I'm sorry, I don't understand the first part (can I say that I am same?) 2nd part: If I hear sound1 ...
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| help plz i need the formula of how its done | 5/16/2007 |
Q: A car decelerates from a speed of 40 km/h to rest in seconds. What is the magnitude of the ...
A: You first will need the speed converted to m/s. (40 km/hr)*(1 hr/3600 sec)*(1000 m/1 km) = 11.1 m/s ...
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| battery | 5/14/2007 |
Q: How exactly does an air/saltwater battery work? Where can i find information on it? how can i ...
A: I have experimented a bit with similar batteries. Without much success. What happens is that you can ...
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| free falling body | 5/10/2007 |
Q: a.what are the applications of free falling body in Nursing in outline form b.what are the ...
A: I don't know if I'm going to help you much with either question. a. I'm sorry, I don't know. My ...
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| mearurement,electricity | 5/8/2007 |
Q: what is difference between chemical and physical balance? is electric current due to flow of ...
A: >>difference between chemical and physical balance: I'm only guessing here. It might have helped ...
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| motion | 5/7/2007 |
Q: Im having difficulty in finding final velocities of two masses in a collision. If a car with an ...
A: In any collision, momentum is conserved. In inelastic collisions, the cars will stick together so ...
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| not sure | 5/2/2007 |
Q: I am wandering how a led work as a charge indicator in a plug in cigarett lighter flashlight?
A: All I can do is guess. I haven't taken one apart. I'm going to guess the led is brightest when the ...
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| motion and acceleration | 5/1/2007 |
Q: the driver of a blue car moving at a speed of 80 km/hr realizes that she is about to rear end car, ...
A: The question really is that easy, no tricks. If the blue car exactly matches the speed of the red ...
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| trains in motion | 4/30/2007 |
Q: Two trains , each having a speed of 30 km/hr are headed at each other on the same track. A bird can ...
A: I assume you accidentally made one typographical error in writing up your question. You said "60/ ...
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| motion and acceleration | 4/30/2007 |
Q: the driver of a blue car moving at a speed of 80 km/hr realizes that she is about to rear end car, ...
A: I suspect there's more to the question than what I understand. All I can say about the question ...
|
| radioactivity | 4/29/2007 |
Q: why ionizing power of alpha rays is greater than beta rays?
A: I'm not the best "expert" to ask this question, but I did find a website ...
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| inertia | 4/29/2007 |
Q: a MAN FALLING ON CEMENTED FLOOR IS HURT SERIOUSLY THAN A MAN FALLING ON SOFT MUD FLOOR?WHY
A: There is a saying about falling: "It's not the fall that hurts you, it's the sudden stop." Comparing ...
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| physics, deriving an equation | 4/28/2007 |
Q: A stretched string, when plucked & then released, gives off a note of frequency 'f' which depends on ...
A: I'm afraid I'm not familiar with the "method of base units". I tried 2 searches and came up empty. ...
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| electromegnetism | 4/26/2007 |
Q: what is possiblity when current induced is zero although magnetic field passing through a coil is ...
A: OK, you didn't like the previous answer? On second thought, I don't like it either. Let me try ...
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| bifilar pendulum | 4/26/2007 |
Q: Please, I need help with my assessment. WHY and how do the distance between the strings and length ...
A: I didn't know about this pendulum so I needed to do a search on-line to find information. Apparently ...
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| electromegnetism | 4/24/2007 |
Q: what is possiblity when current induced is zero although magnetic field passing through a coil is ...
A: I guess that could happen. The affect of the changes in the 2 parameters would have to cancel out. ...
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| multimeter | 4/23/2007 |
Q: .. I want to know how the multimeter works...like if we are checking the the transistors to know if ...
A: I have 3 multimeters in my collection of electronic stuff. One of them is an old analog type. The 2 ...
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| Ideal Gas Law Related ( I think) | 4/23/2007 |
Q: I am having trouble figuring out how to go about this one. I sure would appreciate some insight. I ...
A: Yes I think it's Ideal Gas Law Related. And I agree that the advice you were given was good. But I'm ...
|
| SPACE : Ion Engines | 4/22/2007 |
Q: Steve, I read about ion engines/thrusters on wikipedia.They ionise xenon gas and the Xe+ ions are ...
A: I don't have much specific knowledge about the subject but I'll discuss some of the issues that ...
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| 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: I'm quite sure that the ride is required to reach and maintain a particular angular velocity before ...
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| blackbody radiation | 4/21/2007 |
Q: A blackbody in an enclosure radiates power per unit area sigma*t^4, where t is the blackbody temp, ...
A: My answer is heavily taken from these 2 webpages: http://en.wikipedia.org/wiki/Blackbody ...
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| capacitance | 4/21/2007 |
Q: in the derivation of capacitance for parallel plate capacitor,we start like this: C=Q/V. but the ...
A: I should have remembered from some our previous discussions that you are familiar with Gauss's Law. ...
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| capacitance | 4/20/2007 |
Q: in the derivation of capacitance for parallel plate capacitor,we start like this: C=Q/V. but the ...
A: To respond to your first puzzle: My Physics book starts the derivation of capacitance a couple steps ...
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| motion | 4/20/2007 |
Q: Can you help? A truck with a mass of 2000kg moving up hill at 15m.s requires a force from its wheels ...
A: OK John, I'll take you through the mechanics of resolving the weight into downslope and normal. ...
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| Calculating a Vrms Speed for a Gas | 4/19/2007 |
Q: Can you simply check my work and see if I am on the right path. If so, here is theFind the Vrms for ...
A: Yes, something has gone amiss. In your calculation to obtain temperature you converted from the ...
|
| motion | 4/19/2007 |
Q: Can you help? A truck with a mass of 2000kg moving up hill at 15m.s requires a force from its wheels ...
A: No mention is made of friction so I guess we assume frictionless. Since the truck is maintaining ...
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| DC Motor | 4/18/2007 |
Q: Mr. Johnson, Recently in my Physics class, we built a simple brushless DC motor. The project got me ...
A: Most of what I found and looked at online was from manufacturers describing their units. There are ...
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| Wedge problem | 4/18/2007 |
Q: I am stumped on a problem for my homework. It involves a wedge, with wheels, and a pulley directly ...
A: Sorry, I need help understanding the setup. I know it's hard to describe the drawing that you ...
|
| The speed of light | 4/16/2007 |
Q: Will it ever be possible to travel at the speed of light in a space transport vehicle...... ...
A: 100s of years ago it was said that we would never fly, but who was it that was saying that? Was it ...
|
| Sound/Intensity | 4/15/2007 |
Q: I have some questions about the following situation: Two loudspeakers are located on a coordinate ...
A: 1. If you go to http://en.wikipedia.org/wiki/Sound_intensity you will see that the intensity of ...
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| Physics | 4/15/2007 |
Q: I once rode an amusement park ride where riders stand against the inside of a cylinder, once the ...
A: Newton's 1st says that objects in motion tend to stay in motion, in a straight line, unless acted on ...
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| plzzzzzzz sir reply me very soon..... | 4/14/2007 |
Q: my questions are: Q1. A stone tied to a string is whirled around. Suppose the string has tension ...
A: Q1. Work is F*d*cos(theta), the product of force (or tension in this case), times the distance that ...
|
| Lightbulbs/Circuits | 4/13/2007 |
Q: I have a question about lightbulbs and circuits that came up in my physics class the other day: ...
A: 1) You got the right answer. There are 3 forms of the power equation. We use Ohm's Law to convert ...
|
| Electricity | 4/13/2007 |
Q: I have a question about the following situation: Two identical electric charges +Q are located at ...
A: Remember that I said "The components Ax and Bx will cancel out at point C"? Because of that, some of ...
|
| gauss' theorem | 4/12/2007 |
Q: i need to clear a few things abt gauss' theorem.let me consider a hemisphere with a charge q at the ...
A: Yes I agree with what you say on the first part. On the 2nd part, sorry, I'm not sure I ...
|
| Momentum | 4/12/2007 |
Q: I need your help please with the followingA .15 kg frame, when suspended from a coil spring, ...
A: a) The velocity after a fall of 30 cm is pretty easy. Vf^2 = Vo^2 + 2*a*h where Vo = 0, a=g, and ...
|
| gauss' theorem | 4/11/2007 |
Q: i need to clear a few things abt gauss' theorem.let me consider a hemisphere with a charge q at the ...
A: Well I agree with most of what you say. I have to disagree when you want to say "cover the ...
|
| Mechanical Waves | 4/11/2007 |
Q: I know this has to be something easy, but for some reason, I just cannot find the right equation or ...
A: Sorry, I know that I've been slow with my answer. The light string provides the tension to make ...
|
| Electricity | 4/10/2007 |
Q: I have a question about the following situation: Two identical electric charges +Q are located at ...
A: I agree with almost all of what you did with the first question. Because of the way the question is ...
|
| Electricity/Circuits | 4/10/2007 |
Q: I have some questions about the following circuit: RESISTOR + - __12 ...
A: I think it might help to start with your>What does the potential at X have to do with anything? How ...
|
| machines | 4/9/2007 |
Q: this s question related to class 2 levers Why is an oar rowing a boat considered as second class ...
A: You didn't get Kevin, you got the other Johnson. That's OK, my mailman often brings me mail intended ...
|
| Distance travelled of a falling object | 4/9/2007 |
Q: How far must an object fall to reach a speed of 2 meters per second?
A: I will give you some help finding how to work this. You probably were given 3 or 4 equations of ...
|
| Physics | 4/8/2007 |
Q: A particle of mass 5 kg is acted upon by a force whose power is 10W. If it is initially at rest its ...
A: If the mass was originally at rest, it originally had zero kinetic energy. So it was given kinetic ...
|
| please satisfy me. | 4/8/2007 |
Q: please detail me the concept of free electrons in a conductor,also when an insulator is charged by ...
A: The following websites discuss these. They get more detailed in discussion as you go down. ...
|
| plzzzzzzzz answer me very soon.... | 4/6/2007 |
Q: questions are Q1. Describe all the forces acting upon a ladder that is leaning against a wall. ...
A: See followup at the bottom. Q1. The floor is providing an upward force to support most of the ...
|
| power | 4/6/2007 |
Q: who can do more work? A machine of power 1/4 watt of a machime of power 1/2 watt? I just want to ...
A: Let's say the work to be done is to lift a weight of 10 Newtons 10 meters. A watt is 1 ...
|
| earth's orbit | 4/5/2007 |
Q: Why is the earth's orbit elliptical? That is, what force acts on the earth perpendicular to the ...
A: There is no force that acts on the earth perpendicular to the force of the sun. (At least nothing ...
|
| Earthing a simple circuit | 4/5/2007 |
Q: Consider a simple circuit having, a cell and a bulb connected by UNINSULATED wires? If any ONE point ...
A: If I understand right, the circuit involves 2 uninsulated wires (one from cell + to one side of the ...
|
| brownian motion | 4/4/2007 |
Q: i want to ask questions related to brownian motion 1) why does brownian motion of the suspended ...
A: Let me set up an analogy. A small classroom, with no furniture but one teacher and 20 6 year old ...
|
| Physics | 4/2/2007 |
Q: Can you please sxplain to me what the differences between gravity ahd magnetism are? You'd be a big ...
A: There are some similarities. They can both exert force. Our earth is a source of both. These ...
|
| Newtons's Third Law | 4/1/2007 |
Q: When an object rests on a table, it exerts a force on the table and the table exerts an equal and ...
A: Do you mean during the time the object is still accelerating up to its terminal velocity? I'll ...
|
| mechanics | 3/30/2007 |
Q: it's a problem and here is thethere is a movable wedge(mass 4kg) at an angle of 30.the lower vertex ...
A: OK, I see the setup, thanks. I agree that the force that will accelerate the 1kg mass with respect ...
|
| egg cracking | 3/30/2007 |
Q: what is the pressure required to crack an egg (by tapping it on the edge of some thing)or the ...
A: Sorry, there's no table I can look that up in. The answer would vary depending on the orientation of ...
|
| general science | 3/29/2007 |
Q: the phrase "ten meters per second squared" describes the
A: Those are the units of acceleration. To describe what it means: assume an object starts with an ...
|
| Newtons's Third Law | 3/28/2007 |
Q: When an object rests on a table, it exerts a force on the table and the table exerts an equal and ...
A: Newton's Third Law does apply. There are actually several forces involved while the object is ...
|
| Motion | 3/28/2007 |
Q: A hollow cylinder of mass M and a radius R rolls down an inclined plane. A block of mass M slides ...
A: I will use the conservation of energy principle. Potential energy, M*g*h, will be converted to other ...
|
| inertia | 3/27/2007 |
Q: A 60 kg skater begins a spin with an angular speed of 6 rad/s, by changing the position of her arms, ...
A: Her angular momentum is conserved and is calculated as I*w. You might wonder if energy is ...
|
| Tangential Speed | 3/26/2007 |
Q: What is the tangential speed of Nairobi Kenya, a city near the equator. The earth makes one ...
A: One way to figure this is to calculate the circumference. Then figuring that the earth does one of ...
|
| Satellite | 3/26/2007 |
Q: An artificial satellite in a circular orbit around the Sun has a period of 8 years. Determine the ...
A: OK. I guess I can walk you through the rest of the steps - but it worries me. If you were given this ...
|
| acceleration | 3/25/2007 |
Q: A train passes through a town with a constant speed of 16 m/s. After leaving the town, the train ...
A: You were probably given a set 3 or 4 of equations to use on problems like this. The way to choose ...
|
| Satellite | 3/24/2007 |
Q: An artificial satellite in a circular orbit around the Sun has a period of 8 years. Determine the ...
A: Any particle moving in a circular path requires centripetal force, Fc, of Fc = m*v^2/r to keep it ...
|
| Displacement Vector | 3/23/2007 |
Q: The x and y components of a displacement vector are -3.00 m and +4.00 m, respectively. What angle ...
A: Let me help you drawn this out. Draw an x-y coordinate system. Preferably on graph paper. Just let ...
|
| velocity,distance,time, acceleration | 3/23/2007 |
Q: okay so here's theThe easter bunny runs along a straight and narrow path with a constant speed of ...
A: During those 2.3 hours, the tortoise was slowly increasing his speed. Meanwhile the rabbit was ...
|
| Let's say a giant who had a mass equivalent to one quarter of the earth's mass .... | 3/22/2007 |
Q: Let's say a giant who had a mass equivalent to one quarter of the earth's mass jumped off the earth. ...
A: This can be approached various ways. By the principle of conservation of momentum. If the giant ...
|
| physics problem(hoping for exact answers) | 3/22/2007 |
Q: 1. while giving birth, a mother's uterus contracts and exerts a sudden force of 40 N on the baby ...
A: My practice is to avoid just giving answers to problems. My favorite questions ask for an ...
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| 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: 1. The net force is (40 - 39.8) N. Mass is 2.7 kg. Fnet = m*a s = (1/2)*a*t^2 2. The force on the ...
|
| physics | 3/20/2007 |
Q: Where does a tennis ball bounce higher on top of a mountain or on a plain at sea level?
A: If the collision of the ball and the ground were perfectly elastic, and if this happened in a ...
|
| fuse | 3/19/2007 |
Q: an electric kettle is rated 3kW,250V. so its current carrying capacity is 12A. can it be used in a ...
A: ***Follow-up: I re-read my answer, and I'm embarrased. I must have read your question wrong and ...
|
| Flux | 3/18/2007 |
Q: Why is it that when working out the flux through a coil of wire (using flux = BA), we calculate the ...
A: It looks like you're not clear on the definitions of field and flux. It's tricky. When you say "most ...
|
| FORCE | 3/18/2007 |
Q: An object lying on a horizontal surface is tied with a rope at one end. The object starts moving ...
A: Look at all forces that are in effect. There are at least 3, generally 4 (if you count the tension ...
|
| receivers | 3/17/2007 |
Q: What do the terms homodyne receiver, heterodyne receiver, intradyne receiver stand for? (please ...
A: I'm sorry to admit I can't define them either, so I found links to various discussions. Here are ...
|
| Flux | 3/16/2007 |
Q: Why is it that when working out the flux through a coil of wire (using flux = BA), we calculate the ...
A: I'm not clear what you mean by the terms loop versus coil. Apparently they are separate circular ...
|
| Newton's Law of Gravitation... | 3/15/2007 |
Q: Can you see if I am doing this correctly? The question is: Calculate the energy in joules ...
A: I expected the cost to come out higher too, but your work looks almost perfect. I disagree with the ...
|
| Rate of heat flow | 3/13/2007 |
Q: The rate of heat energy flow along a metal bar at any point is proportional to the temperature ...
A: Calculate T(0) and T(1). Plugging 0 and 1 in for x, T(0) = 1/10 = 0.1 T(1) = 1/12 = 0.083 T(2) = ...
|
| Terminal speed in fluid | 3/10/2007 |
Q: A spherical object of radius (r) moving slowly in a fluid medium is subject to a viscus drag force k ...
A: There are 3 forces acting on the ball bearing: Weight of the ball bearing W = m*g Bouyancy, B, of ...
|
| Forces | 3/8/2007 |
Q: m1 m2 F--- |__||---| surface under m2 in frictionless ...
A: The first problem is that m1 must be pressed against m2 hard enough to keep it from falling. The ...
|
| Earth's Spin (and moment of Intertia, I) | 3/8/2007 |
Q: The moment of inertia of the eart about its spin axis is approcimately 8.03 x 10^37 kg m^2. (a) ...
A: The moment of inertia, I, is a term that is defined as the sum, for all particles of a body, of the ...
|
| physics problem | 3/7/2007 |
Q: 1. a man weighing 160 lb stands in an elevator. as the car starts upward, for a short time there is ...
A: 1a. If the man accelerates, there is a net force on him. First, need an expression for his mass: w = ...
|
| themordynamics | 3/5/2007 |
Q: A jogger's internal energy changes because he performs 6.20* 10^5 J of work and gives off 4.9*10^5 ...
A: Oh C.C. I'm sorry, I messed up. I used 4.9*10^5 J for both Q and W. Revised reply: The jogger's ...
|
| thermodynamics | 3/4/2007 |
Q: I have to fill out a chart with deltaU, Q, and W I have fill out most of it but can't figure out how ...
A: C., I found what seems to be a problem with the table you gave me to work with. I'll let you see ...
|
| themordynamics | 3/4/2007 |
Q: A jogger's internal energy changes because he performs 6.20 105 J of work and gives off 4.9 105 J ...
A: C., I think you mean 6.20 105 J to equal 620,000 J. If so, to avoid confusing me, I would like you ...
|
| Physics applying to the car | 3/2/2007 |
Q: I am wondering how Newton's three laws apply to the car? Thank you so much, Ash
A: Newton's 1st: If the car is sitting at a red light, when the light turns green, the driver needs to ...
|
| Electrocution | 3/1/2007 |
Q: my question is somewhat longer ,sorry for it imagine theres a high voltage power line suddenly ...
A: 1) That line may jump around on the ground. Sparks may also fly. If you are far enough away to avoid ...
|
| Problem | 3/1/2007 |
Q: I was wondering if you can go through the steps and eplain how to solve this problem. A rock ...
A: a) Work is calculated as the force exerted times the displacement the force caused -- times ...
|
| Rate of speed | 2/28/2007 |
Q: After traveling 110 miles of a 200 mile trip a motorist decreased his speed by 20 mph for the last ...
A: Let the total time be T, the time of the 1st leg be t1 and time of the 2nd leg be t2. So T = t1 + ...
|
| circular motion | 2/27/2007 |
Q: IN A CIRCULAR, THE DIAMETER OF GLOBE OF DEATH IS 20M FROM WHAT HEIGHT MUST A CYCLIST START IN ORDER ...
A: I haven't seen this done. I searched and saw a bunch of photos, but I still don't know for sure how ...
|
| the egg.. | 2/25/2007 |
Q: how much force is needed to break an egg? because we are about to make a footwear that could walk on ...
A: It's hard to say how much force is needed to break an egg. It would depend how you deliver the ...
|
| physics | 2/24/2007 |
Q: joyce here again...,asking for your help...pls.Our topic is all about potential and kinetic energy. ...
A: 1. Potential energy = m*g*h. You have the mass, g=9.8 m/s^2, h = # steps * height/step. (Convert cm ...
|
| Conservation of Momentum (Inelastic Collisions) | 2/23/2007 |
Q: Yes, we have the initial velocity of the ball of 1.3 m/sec. We have the sliding distance of ...
A: OK, ummm, I would like to modify what I said in my first answer. A little embarrassing - I just came ...
|
| Conservation of Momentum (Inelastic Collisions) | 2/22/2007 |
Q: I think I have this problem figured out, but there is a tiny roadblock in my progress. If a ball ...
A: If I understand the problem right, I think it's more of a conservation of energy problem. Do you ...
|
| Electric Fields | 2/8/2007 |
Q: I am really struggling with the concept of electrical forces and fields. My question is: A particle ...
A: Don't worry about the description being lengthy. It helps me to know where the confusion lies. ...
|
| density | 2/8/2007 |
Q: The question gives me the weight of the block of gold in newtons is it still possible to figure this ...
A: I can't tell where you're hung up, so I'll work it out with the assumption I made before, that the ...
|
| physics | 2/7/2007 |
Q: It is said that thicker conducting wires offer less resistance to curren. But i fail to understand ...
A: If each of 2 different size copper wires is carrying 1 amp, the thicker wire has less resistance. ...
|
| physics question | 2/7/2007 |
Q: The mass of a newborn baby’s brain has been found to increase by about 1.0 mg per minute. How much ...
A: Interesting information. I wonder how they determined that. Anyway - well first you need to find ...
|
| density | 2/6/2007 |
Q: I have a question about finding the weight if an object in water. I have the weight of the gold gold ...
A: This is a fairly easy one to explain. You haven't given me the dimensions or the volume of the ...
|
| Projectile motion | 2/1/2007 |
Q: where do you find the coefficient of drag in an example pertaining to a bullets flight?
A: It looks like these web sites will tell you all about that, and more. ...
|
| Gauss's Law | 1/31/2007 |
Q: I have a (three-part) question on Gauss’s Law. If you enclose a dipole in a spherical Gaussian ...
A: What Gauss’s Law says in the case you describe is that the NET flux through the surface would be ...
|
| home made wind generator | 1/30/2007 |
Q: I am trying find a way to make a simple (but powerful) alternating generator of electricity from a ...
A: The squirrel cage motor is an induction motor. The rotating magnetic field generated by the stator ...
|
| life period of aircraft | 1/30/2007 |
Q: how long do aircraft last, I mean in flying terms, can a plane built 20 years ago still flyable?
A: Check out these sites: http://edition.cnn.com/TRANSCRIPTS/0006/24/stc.00.html Go about 2/3 of the ...
|
| Electric motor amps | 1/28/2007 |
Q: Is there an equation to determine max amps for a 440 VAC motor rated at 15 HP?
A: Well, ummm ... yes, but. There are more factors invlolved than what you list. I'll discuss the ...
|
| 3 pin plugs | 1/26/2007 |
Q: what are the safety features for a 3 pin plug?
A: My answer is a brief description of the way power is distributed in the US. I'm not sure how similar ...
|
| Volume | 1/24/2007 |
Q: A small sculpture made of brass ( p brass = 8870 kg/m^3 ) is believed to have a secret central ...
A: The decrease in weight is due to buoyancy. The amount of the decrease (1.90 N), and the density of ...
|
| physics | 1/23/2007 |
Q: Our new topic is all about free falling bodies, and our teacher didn't explain it well again and ...
A: There is a series of motion equations that you probably have been given in class. Sometimes not all ...
|
| LED LIGHT RUN..... I NEED HELP! | 1/23/2007 |
Q: I thought I knew enough about electricity and physics to do an LED light project.... I WAS WRONG. ...
A: I admire your confidence that you can figure it out, with a bit of help if needed. My first concern ...
|
| Physics | 1/21/2007 |
Q: A Toy rocket launched from the ground rises vertically with an acceleration of 33m/s2 for 2.8s until ...
A: You can use this basic motion equation to get the velocity after the powered phase of the flight: V ...
|
| physics question | 1/19/2007 |
Q: When the space shuttle is in flight, and it discharges it's booster rockets, the space shuttle ...
A: I worked on it for 8-9 years and thinking about it again was a pleasant trip down memory lane. My ...
|
| temperatures | 1/18/2007 |
Q: Which would cause a more serious burn, 30g of steam or 30g of liquid water, both at 100 degrees C ...
A: That's hard to answer but I'll give it my best guess. It's true that the steam has more heat ...
|
| HEIGHT CALCULATION | 1/18/2007 |
Q: STONE OF MASS 0.62KG FIRED UPWARDS AT ANGLE TO GROUND, SPEED 5.5M/S. KE AT MAXIMUM HEIGHT ABOVE ...
A: At max height, there is no vertical component of velocity. So the KE at max height can tell you the ...
|
| controling gravity | 1/17/2007 |
Q: could we control gravity
A: No we can't, at least not with any knowledge we have now. The force of gravitational attraction, F, ...
|
| Simple Harmonic Motion | 1/17/2007 |
Q: A 0.350 kg block moving vertically upward collides with a light vertical spring and compresses it ...
A: You seem to be off by a factor of 2. I started out guessing that you messed up by not using the ...
|
| Heat | 1/16/2007 |
Q: Two spheres labled A & B, have identical masses, but are made of different substances. The specific ...
A: OK - an amount of heat, Q, is given to both. We don't know the mass, so I say m is the mass of both. ...
|
| Perpetual energy machine | 1/16/2007 |
Q: Is it possible to make a machine that feeds off the energy it creates? Like a lamp shining on a ...
A: Sorry, no. The example you describe would fail. An incandescent light is only about 5% efficient at ...
|
| Mass | 1/14/2007 |
Q: A force of 250N is applied to a hydraulic jack piston that is 0.01m in diameter. If the piston which ...
A: Problems with hydraulic jacks can be solved fairly easily once you understand pressure. Pressure is ...
|
| i can hardly understood this, pls. help me | 1/13/2007 |
Q: But honestly, i dont know how to apply the given from those equations. Can you pls. show me the ...
A: Sorry that didn't do it for you. OK, with bells and whistles and 3-part harmony: 1)A car moves at ...
|
| i can hardly understood this, pls. help me | 1/12/2007 |
Q: sir steve! Hope your doing fine as always. i need help again. Im kinda confused what equation would ...
A: 1) The equation that will work well on this is x = Vo*t + (1/2)*a*t^2 where Vo is the original ...
|
| Pressure | 1/11/2007 |
Q: An ice cube, p = 917 kg/m^3, is sliding down a frictionless incline of 16 degrees. The sides of the ...
A: The 917 kg/m^3 seems to be density (you call it p?). The volume of the cube is .75^3 m^3. So the ...
|
| Physics | 1/11/2007 |
Q: Good mornign sir!, I am not that good in Physics but I must pass my Physics subject. May I ask your ...
A: The waves have a speed of 0.32m/s. So how far does a particular crest go in 1.6 s? 0.32 m/s * 1.6 s ...
|
| egg drop experiment | 1/9/2007 |
Q: Dom's mom here - I'm trying to help Dominic understand physics concepts - gravity, air ...
A: >Would Newton's 2nd law have anything to do with the parachute drop? Yes it would. This explanation ...
|
| Gun Recoil | 1/9/2007 |
Q: A rifle weighs 50.0 N and its barrel is 0.750 m long. It shoots a 25.0-gram bullet, which leaves the ...
A: We will need the time, t, that the bullet was still in the barrel. Using the equation x = ...
|
| AC motors | 1/8/2007 |
Q: I’m having trouble understanding the principles of operation of a single phase AC motor. I ...
A: It seems that you're mistaken about your statement: "there should be a constantly rotating magnetic ...
|
| egg drop experiment | 1/8/2007 |
Q: This is my first science experiment. I dropped medium and extra large eggs, raw and hard boiled from ...
A: It depends on how the parachute was designed. I assume there were 4 12 inches strings, one to each ...
|
| force 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: I agree with your answer for 2). The midpoint of the rope will accelerate the same as all the other ...
|
| i can hardly understood this, pls. help me | 1/5/2007 |
Q: its me and needs a little (big) help again! to open up, i would like to greet you a happy prosperous ...
A: you have a good one too. And I should ask you, for a new question unrelated to an old one, don't ...
|
| i need help so bad!! | 1/5/2007 |
Q: your teacher tosses a basketball and it goes through the hoop! how long does it take the ballto ...
A: My first thought is that there is much more data given than is necessary. Example: The horizontal ...
|
| Spring constant | 12/31/2006 |
Q: A ping pong ball weighs 2.5 * 10^-2N. The ball is places inside a cup that sits on top of a verticle ...
A: The spring accelerates the ball while the spring returns to its rest position, releasing its stored ...
|
| impulse &acceleration | 12/30/2006 |
Q: Dose a moving have impulse? Please give reason also. A car is accelerating at the road which force ...
A: I don't clearly understand your question so I'll explain about impulse as well as I can. It's very ...
|
| Mass | 12/30/2006 |
Q: A cable stretches by an amount d when it supports a crate of mass M. The cable is replaced by ...
A: I refer you to http://en.wikipedia.org/wiki/Young's_modulus. About 1/2way down the page is the ...
|
| newtons laws of motion | 12/28/2006 |
Q: A block of mass m is placed on top of an inclined plane. The mass of inclined plane is M. All the ...
A: Assumptions: The inclined plane appears, when observed from the side, to be the hypotenuse of a ...
|
| friction | 12/28/2006 |
Q: What is difference between 'sliding' 'rolling' 'slipping' of a body when friction is considered ? ...
A: I find that in many contexts, slipping and sliding are used as synonyms. But in a relatively new ...
|
| spheres | 12/25/2006 |
Q: A solid sphere of radius R rotates about a diameter with an angular speed. The sphere then collapses ...
A: The "internal forces" would have done work in collapsing the radius, so we won't think about ...
|
| help plz | 12/21/2006 |
Q: the answer which u gave explained it very well and i did understand it. but the only prob is tht ...
A: So the book is talking about a condition where only the ice above the surface melted and the ice ...
|
| Kinetic Energy | 12/20/2006 |
Q: A 50 kg rider on a moped of mass 75 kg is traveling with a speed of 20 m/s. Each of the two wheels ...
A: Yes, it looks like your formulas are good. So here's some help with converting 20 m/s to rad/s. When ...
|
| physical science | 12/20/2006 |
Q: if it took 5 seconds to lift the crate using a machine what wat the rating of the machine
A: I think power is the rating you are looking for. In lifting the crate, the machine does work, W. W = ...
|
| Thermal Energy | 12/17/2006 |
Q: Johnson, I'm reviewing for my physics final and I'm having a little trouble with this problem. ...
A: From conservation of energy, the potential energy of the shot when on top of the building needs to ...
|
| help plz | 12/17/2006 |
Q: thnks for ur mail. can u plz help me out with this question? when a floating piece of ice melts into ...
A: Medicine is a fine place for someone with science talent. Go for it. Ice floats because it is less ...
|
| Archimedes principle | 12/15/2006 |
Q: Please answer this, Why wouldn't the weight of the fish have an apparent decrease due to the ...
A: (followup below) I think I can convince you with an analogy. Say you were standing on a bathroom ...
|
| Archimedes principle | 12/14/2006 |
Q: Please help me with this question Steve. A bucket containing water is placed on a compression ...
A: Let the fish's weight be W2 Kgf (whatever a Kgf is). The balance will show W1+W2 Kgf. Archemedes ...
|
| Work | 12/14/2006 |
Q: i am a grade 12 physics student, and i have a question regarding work done when an object is lifted ...
A: It seems so doesn't it? If you did that with several heavy objects you would 'work' up a sweat. But ...
|
| field force | 12/11/2006 |
Q: 1. what is voltage, are there positive charges involved here? how does this work? 2. where does the ...
A: 1. Starting with the charges, there are positive and negative charges. This is one of the origins of ...
|
| linear momentum | 12/10/2006 |
Q: could u help me with this question A man of mass "M" having a bag of mass "m" slips from the roof ...
A: I can help with that but I'm going to leave most of the algebra to you. You need to know how much ...
|
| Kinematics | 12/10/2006 |
Q: During the spin dry cycle of a washing machine, the motor slows from 95 rad/s to 30 rad/s while ...
A: The familiar 4 formulas of linear motion have equivalents in rotational motion V = Vo + a*t ...
|
| relative motion | 12/9/2006 |
Q: What one measurement will two observers in relative motion always agree upon? Please help!
A: I'm not 100% sure this is what you need. My answer is the measurement of the relative motion between ...
|
| Physics | 12/8/2006 |
Q: 1. If one body is positively charged and another body is negatively charged, free electrons tend to ...
A: Given such a long list of questions, I'm not willing to go to much work on any that I don't know ...
|
| atoms of air | 12/8/2006 |
Q: sir, air molecules are alwalys surrounding us.they are made of mass though negligible.then why ...
A: The air molecules do have an effect (but it's not their weight), it's a slight amount of bouyancy. ...
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| Heat | 12/7/2006 |
Q: Could you please check my answers to see if they are right THANKS 1. A silver bar 0.125 meter ...
A: Given such a long list of questions, I'm not willing to go to much work on any that I don't know ...
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| what determines current in a lemon battery? | 12/6/2006 |
Q: i'm a secondary school physics teacher. i made a lemon battery by connection about 24 lemons in ...
A: I'm glad that you asked several of us. I can confirm that I've seen those results from my own ...
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| Where does the springs energy go? | 12/6/2006 |
Q: A spring made of metal is compressed and while keeping it compressed (by some apparatus)it is put ...
A: This is a fascinating question. I thought the energy had to show up as heat, but I wasn't sure, so I ...
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| linear momentum | 12/5/2006 |
Q: can u help me out with this question. Two persons each of mass m are standing at the two extremes of ...
A: I assume "resting" means it is stationary - wouldn't want anyone to get run over. I need to make ...
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| help | 12/4/2006 |
Q: A swimmer is under water and looking up at the surface. If someone holds a coin in the air, above ...
A: First have to assume the swimmer can remain perfectly still and there's nothing else causing ...
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| physics help | 12/4/2006 |
Q: Light of wavelength 550nm is incident on a diffraction grating. If the third order bright fringe is ...
A: Optics was never my interest and I forgot most or all of what I learned. So I had to turn to the ...
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| Inductor Charging | 12/3/2006 |
Q: Does an inductor charge faster through a low resistance or a high resistance? and why? I know an ...
A: When a voltage, E, is applied (for instance by closing a switch) across a series R and L, the ...
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| Physics question | 12/2/2006 |
Q: You observe three (non-interacting) particles with: m1=1 kg, m2 =2 kg, and m3 =3 kg, and at ...
A: Unfortunately I can't read your question. Example: It looked very bizarre (&s and #s) in my email ...
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| Tennis Ball Momentum | 11/30/2006 |
Q: But where does the wall's momentum come from(since the earth rotates?) and does the wall's momentum ...
A: Sorry my previous answer didn't do the job. >But where does the wall's momentum come from(since ...
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| Tennis Ball Momentum | 11/29/2006 |
Q: A tennis ball bounces off a wall elastically. How does wall have momentum -2mv to transfer, but no ...
A: Saying that a tennis ball bouncing off a wall is elastic, is an approximation. KE is not 100% ...
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| kinetic energy | 11/28/2006 |
Q: I want to desing a cell phone battery that depends on kinetic energy. How can I send the amount of ...
A: Hola Jorge, I think I need more detail to answer fully. There are flashlights (flashlights in ...
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| Pole Vaulting | 11/28/2006 |
Q: How is it possible for a pole vaulter's center of gravity to pass beneath the bar?
A: Consider that you made a large U out of cardboard. The c of g would be someplace in the open area ...
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| Har,onic oscillator | 11/27/2006 |
Q: I have a simple question, what is the angular frequency in the following equation? x = (20.6 cm) ...
A: So you need to convert to the form x = A*cos(w*t + p) where w is omega, in radians/second, and p ...
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| Solar Cells | 11/26/2006 |
Q: I want to know about Solar Cells.Could you help me to find some general information about Solar ...
A: These links will probably give you more than you need to know. I hope one of them will be just ...
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| Accleration | 11/26/2006 |
Q: I understand the formula for finding acceleration and that the SI unit for acceleration is meters ...
A: Let me start with a review of velocity. Velocity, V, is the rate of changing position. V = delta ...
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| 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: Unfortunately my physics expertise is minimal beyond the first year of college physics. This topic ...
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| White laser | 11/21/2006 |
Q: Is there anyway for there to be a white laser? Maybe bouncing a red, green, and blue laser off of a ...
A: If you and 2 friends each had a laser pointer, one each red, green, and blue, and could hit the same ...
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| General College Physics | 11/21/2006 |
Q: Is water a conductor or insulator. Explain?
A: Heat conductivity: The material with the highest heat conductivity listed by my source is purified ...
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| Physics Question | 11/20/2006 |
Q: A 0.6m-diameter lead sphere has a mass of 5600 kg. A dust particle rests on the surface off the ...
A: The normal everyday weight of the dust particle in the earth's gravitational acceleration is given ...
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| 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: Well if that's all the given information, I'm kind of stunned too. I guess the student is required ...
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| circuits | 11/18/2006 |
Q: It is easy to see that a sinusoidal voltage applied directly to the terminals of a passive component ...
A: OK Mark, I maintain that an individual component buried deep in the circuit will have a potential ...
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| circuits | 11/16/2006 |
Q: In my circuits class, we were first taught how to solve DC circuits. Then we moved on to AC ...
A: Well, the 2 premises are not true for arbitrary circuits of any complexity or size. For example, the ...
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| Physics | 11/16/2006 |
Q: Johnny drives to wisconsin (1920 miles) in 32 hours. He returns hoem by the same route in the same ...
A: a) The units of speed, normally used for car travel (in the US), is miles per hour or miles/hour. ...
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| Laser frequency | 11/15/2006 |
Q: I have a green and red laser pointer, and was wondering if there is an inexpensive way to create a ...
A: I answered without learning all the details. Thanks for getting me to learn more. Knowledge is good. ...
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| Laser frequency | 11/14/2006 |
Q: I have a green and red laser pointer, and was wondering if there is an inexpensive way to create a ...
A: Sorry no, that's not going to work. The light from a laser is a specific frequency. A filter can't ...
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| physics help | 11/13/2006 |
Q: An electron having a speed of 4*10^6 m/s is moving perpendicular to a uniform magnetic field of 0.5 ...
A: The force F (a vector) on a charge q moving in a magnetic field B is given by F = q*(vxB), where ...
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| rocket height. | 11/13/2006 |
Q: Got a question here that I dont really know how to tackle. A net force (F= -mg - kv^2 ) acts during ...
A: To be sure I understand: * The net force after engine cutoff is F = -mg - kv^2. * You're asked to ...
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| radio waves | 11/8/2006 |
Q: i'm a 32 years old teacher. will you please tell me why the dishes to receive satellite tv signals ...
A: I've had a similar question before and it is frustrating how little there is to be found on the web ...
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| Question on acceleration | 11/8/2006 |
Q: a 2.0kg otter starts from rest at the top of a muddy incline 85cm long and slides down to the bottom ...
A: 2 equations will do this for you. The otter starts from rest at the top, accelerates for 0.5 seconds ...
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| School Physics | 11/7/2006 |
Q: The definition of Equilibrium I have is : When a body does not change its state of rest or uniform ...
A: Your definition is OK. The problem is in your understanding of it. Perhaps the definition in my old ...
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| physics | 11/7/2006 |
Q: what is the done by the earth in moving around the sun?
A: The rotation of the various planets would set up an equivalent to our tides. Because of the heat, ...
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| physics question | 11/6/2006 |
Q: not sure if you are the right expert? I want to know if disc magnets threaded onto a live ...
A: I'm not sure I'm the right expert either. I did some searches for disc magnets. One problem I see is ...
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| air pressure | 11/6/2006 |
Q: I would like to know how the weather is affected by air pressure? I'm on the first year of faculty ...
A: Well I know that when we have a high pressure system overhead the weather is nice. When there is a ...
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| 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: This is more a question for a biologist, but I can take a shot at it. It's decomposition at work. ...
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| Rigid Body | 11/4/2006 |
Q: A rigid body rotates about a fixed axis with a constant angular acceleration, does the tangential ...
A: Yes. Tangential means perpendicular to a radius. Let's talk about velocity first. Velocity in the ...
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| physics | 11/3/2006 |
Q: if a fish is resting on the bottom of a bucket that is filled with water while it is being weighed ...
A: No it will not. A similar and common question regards a truck full of canaries. And that is a bit ...
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| DC to AC | 11/3/2006 |
Q: What is the specific terminology used for the conversion of DC to AC?(Like the conversion of AC to ...
A: The usual device to do this is called an inverter. See http://en.wikipedia.org/wiki/Inverter This ...
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| walking | 11/2/2006 |
Q: I am a high school physics student with a question. What are the forces involved in walking? Also, ...
A: In the normal stride, there's not much more than picking up your foot at the end of its contact with ...
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| PHYSICS | 11/1/2006 |
Q: what do you mean by degree of freedom of system in general?
A: It's hard to answer in general. There are specific meanings depending on the field you are in at the ...
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| Rotational Inertia | 10/31/2006 |
Q: Johnson, Thanks for answering so quick! I drew a diagram and uploaded it here; ...
A: My answers are sometimes difficult without a figure so I will probably include a link thru tinypic ...
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| heat | 10/31/2006 |
Q: If you wish to warm 100 kg of water by 22°C for your bath, how much heat is required? ((The heat ...
A: I have to point out how easy this is - if you understand. Perhaps I can help you understand - that ...
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| Rotational Inertia | 10/30/2006 |
Q: Johnson, Hi there! I was wondering if you can help me with this problem i have to solve. I've tried ...
A: I'm afraid I need to ask for more detail. I need a clear picture in my head of the parts. Are the 2 ...
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| conservation of momentum | 10/29/2006 |
Q: Could u please help me with this question-An open watertight railway wagon of mass 5000 kg is moving ...
A: This is a case of conservation of momentum in an inelastic collision. Inelastic because the rain ...
|
| 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: You're right, Q=mct is the answer. That will give you calories. I guess that's the "useful" energy ...
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| physic | 10/28/2006 |
Q: I would appreciate your answering to these questions. The production of carbon dioxide increases as ...
A: This is a question better asked of a biologist but I can offer an opinion for #1. Many, or perhaps ...
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| I was in a recent car accident. | 10/27/2006 |
Q: I was in a recent automobile accident in which I was ejected from the car. We were traveling at ...
A: You are either a miracle or a prankster. I'll believe you're a miracle. But there's no way to know ...
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| sound | 10/25/2006 |
Q: I actually have more than one question if you dont mind answering then i would greatly appreciate ...
A: 1) That particle will be disturbed very little. 2) I'm not very sure on this one but I'd guess A ...
|
| Defect in Newton's Law of Motion.. ! | 10/24/2006 |
Q: Q) If we throw a ball up it comes down .. Action and Reaction Newton's 3rd Law... Ball goes up ...
A: Well I'm going to try to defend my friend Isaac. >If we throw a ball up it comes down .. Action and ...
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| rotational equilibrium | 10/23/2006 |
Q: I just want to ask how am i going to solve a see-saw problem with two masses at one end and a single ...
A: I think you left out a word in the sentence about the unknown. But I can describe in general how to ...
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| calucalting the force of an ocean wave | 10/22/2006 |
Q: Can we use Newton's 2nd Law -- F=MA -- to describe the force of an ocean wave hitting a sea wall? ...
A: Waves are classified as transverse (particles vibrate perpendicular to the direction of wave travel) ...
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| belt tension gauge | 10/22/2006 |
Q: Please give me the equations. How does the tool know the angle between the forces?how does a belt ...
A: Sorry it's taken a couple days to answer. I have been thinking about how best to describe this, and ...
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| 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: There seem to be some contradictions in the literature from the link you gave. Maybe you saw that ...
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| Gun Recoil | 10/21/2006 |
Q: A 30-06 caliber hunting rifle fires a bullet of mass 0.00953 kg with a velocity of 500 m/s to the ...
A: Before pulling the trigger, the momentum of the rifle (m1) including the bullet (m2), is (m1+m2)*0 ...
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| pull and push | 10/19/2006 |
Q: why is it easier to pull than to push. Explain it with vectorical reasons
A: I don't believe it's always true. Sometimes it's easier to push than pull. What if you had a tall ...
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| PHYSICS | 10/15/2006 |
Q: why in metals relaxation time is equal to collision time?
A: This topic requires detailed discussion. I refer you to the following sites. ...
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| incline | 10/14/2006 |
Q: A 9.0kg box slides from rest down a frictionless incline from a height of 5.0m. What is its speed at ...
A: This is a question that will benefit from use of the principle of conservation of energy. When at ...
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| light | 10/11/2006 |
Q: Say you are in space, how can you recognize a double star (2 stars that revolve around their center ...
A: The site http://en.wikipedia.org/?title=Double_star gave me a link to ...
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| physics (velocity/distance traveled) | 10/10/2006 |
Q: I need help finding the formula that will solve this problem: A ball is thrown horizontally from a ...
A: I'm going to assume the ball is "thrown", not from shoulder height but from the top surface of the ...
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| equilbrium | 10/10/2006 |
Q: A body is in translational equilibrium if it is either at rest or moving with constant velocity, is ...
A: According to the Encyclopedia Britannica: "equilibrium is a condition in which the net force acting ...
|
| energy question | 10/8/2006 |
Q: I've been stuck on this question and many others. I don't know how to answer it. "a daredevil on a ...
A: Let me give you a tip. The 35 m/s speed is at the angle of the ramp - I know, you don't know the ...
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| magnitude | 10/8/2006 |
Q: I am sorry about the confusing question. Fm = the magnitude of the gravitational force on the marble ...
A: Newton's law of universal gravitation says the force between any 2 mass particles, mass m1 and m2, ...
|
| Energy used by Light Bulbs | 10/5/2006 |
Q: How much does it cost to leave a 100w light bulb on for a year? Assume average current cost for one ...
A: According to http://www.coaleducation.org/Ky_Coal_Facts/electricity/average_cost.htm, the average ...
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| Sound/motion | 10/4/2006 |
Q: We are researching motion for our grammar class, and I am writting my paper on golf. Why a golf ...
A: I've never had a golf ball go flying past my head (fortunately) so I'm not sure I've heard the sound ...
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| projectiles | 10/4/2006 |
Q: A Basketball player has to put the ball into a hoop 3.7meters above the court. If the player ...
A: First you need to determine the horizontal and vertical components, Vho and Vvo, of the original ...
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| potential difference relating to electric fields | 10/3/2006 |
Q: A cell (source of emf) has a voltage across the two terminals because the cell causes electrons to ...
A: Regarding your last paragraph, about Kirchoff: yes the electrons pass through. It's like water ...
|
| Dynamics | 10/2/2006 |
Q: oopz..i messd up a bit vid da ques.heres da ques: - two shipz A and B leave the port at the same ...
A: This is really just an exercize in trig. In 1 hour A goes 15 km and B goes 10 km. Draw it out on ...
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| VERY VERY URGENT ????????? | 10/1/2006 |
Q: (SENDING IT AGAIN) hi i'm in 12th, please give me proof of parallel axis theorem(rotational ...
A: OK, I'll try to help. I notice that the web sites I gave you had an un-needed complication in one ...
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| What would we see, if we could travel at the speed of Light ? | 10/1/2006 |
Q: My question is about travelling at the speed of light. If I could travel exact at the speed of ...
A: I follow the question archive fairly closely and have enjoyed seeing some of your questions. They ...
|
| Projectile motion | 9/25/2006 |
Q: A fire hose held near the ground shoots water at a speed of 5.1 m/ s. At what 2 angles could the ...
A: It's interesting. I had an almost identical question 10 days ago. I hope it's OK with you if I just ...
|
| fluid dynamics? | 9/23/2006 |
Q: If a circular vessel containing water spins slowly, how is the water inside generally affected? ...
A: When the vessel is first brought up to the slow speed, the rotation of the water will lag behind for ...
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| VERY VERY URGENT ????????? | 9/22/2006 |
Q: please give me proof of parallel axis theorem(rotational motion)&explain thoroughly. Why integral in ...
A: see followup at end Giving you links to some good discussion will be quicker than me writing up ...
|
| football | 9/22/2006 |
Q: This is a physics question about football. Since I am not familiar with American football, I have ...
A: The stuff about football is just trying to make it hard to find the critical info. And it would be ...
|
| laser | 9/20/2006 |
Q: would cds made for red lasers be readable by blue laser machines ?
A: Yes and no, or maybe. Check out ...
|
| Newtonian Physics: Gravity | 9/19/2006 |
Q: How strongly, and in what direction does a 1-newton apple pull on the earth? I understand that the ...
A: The apple exerts a 1-Newton pull on the Earth - toward the apple. It's fitting that we're talking ...
|
| Science Fair Project Research | 9/19/2006 |
Q: How far can you throw a water balloon before it will bust? This is my science fair question. I am ...
A: This should be a fun project. I'll try to help you do some proper research while you have fun. One ...
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| projectile motion | 9/15/2006 |
Q: i'm not familiar with the formulas u used. the ones i learned were: vf = vo + at final velocity = ...
A: I did use the first of the 2 formulas you listed above. But I changed a few variable names to ...
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| projectile motion | 9/14/2006 |
Q: A fire hose held near the ground shoots water at a speed of 6.5 m/s. At what angle(s) should the ...
A: Break the velocity into components: Horizontal velocity, Vh = cos(theta)*6.5 m/s Time to go 2 meters ...
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| satellite orbits | 9/11/2006 |
Q: thanx 4 ur suffecient & nice answer ..it satisfied my info lack.. but i've a unique question, if we ...
A: OK, that's an interesting question. The result would depend on a few additional details about how ...
|
| Physics- General Science | 9/11/2006 |
Q: In physics the "desire of an object to keep doing what it is doing" is termed..... permanence ...
A: The 2nd choice gave me a chuckle - thanks for that. Physics calls that characteristic inertia. ...
|
| principles | 9/10/2006 |
Q: what are some principles or laws in a ballon powered car?
A: The principal principle to be used in analysis of this toy is the conservation of momentum. You ...
|
| Newtons | 9/10/2006 |
Q: Is a Newton a measurement of force, and if so, is 1 Newton a lot
A: Yes, the Newton is a measurement of force, and weight. Is it a lot? The weight of 1 kilogram is ...
|
| Energy, power | 9/9/2006 |
Q: Find power in terms of displacement (s) if the mass of body is m and force F=Ks^(-1/3)(i.e ...
A: Power is Work divided by time, so the result will also be in terms of time. Work is Force times the ...
|
| Pressure | 9/8/2006 |
Q: There is a apparatus where a test tube is covered with a nonpermeable elastic membrane and sealed in ...
A: I will guess that the test tube contains air and the syringe contains air. So when the plunger is ...
|
| the difference between two electromagnets | 9/7/2006 |
Q: I have a question that I have been stuck on for ages: What is the difference between two ...
A: I will assume your electromagnets are in solenoid shape (straight tube). As said in ...
|
| 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: I have seen many questions answered on this topic. This is the first I have gotten. It seems that ...
|
| Object sizes | 9/6/2006 |
Q: It seems obvious that it should, but why does an object appear to get smaller when you move it ...
A: Horizontal size is interpreted by our brain from the angle between lines from our eye to the left ...
|
| satellite orbits | 9/6/2006 |
Q: why satellites dont fall down over earth service ? which make it spining around earth ? ...
A: See http://en.wikipedia.org/wiki/Orbital_velocity and ...
|
| pk & 99channels | 9/5/2006 |
Q: i have two questions 1.) i notice '2.5pk', a lable on our airconditioner. what does it mean? 2.)in ...
A: 1) I find that pk is a unit used in Jakarta, Indonesia, and the Dutch language and is related to ...
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| Magnets and electricity | 9/3/2006 |
Q: A lawn mower would be disqualifie because it depend on something other than the magnet itself. ...
A: Ah, I see that you are trying to get energy out without putting energy, or work, in. Sorry, that ...
|
| general | 9/1/2006 |
Q: why does a small steel pin sinks and a massive ship floats
A: Let's talk about an empty aluminum soda can first. If you seal the hole in the end so water does not ...
|
| Magnets and electricity | 9/1/2006 |
Q: Can electricity be created from the use of magnets? I know (and in fact have) there are magnet ...
A: >Can electricity be created from the use of magnets? Yes, as your example shows. Also engines like ...
|
| physics | 8/31/2006 |
Q: a student drops a ball from a window 4.5m above the sidewalk. the ball accelerates at 9.80m/s ...
A: Before giving you some help with your question, let me see if I can give you some general help with ...
|
| Inducing clouds to rain | 8/29/2006 |
Q: In thinking of ways to help minimize the potency of hurricanes...... can a cloud, say over ocean ...
A: I believe that a cloud can be induced to rain. Whether that would help minimize the potency of ...
|
| electricity | 8/27/2006 |
Q: ""Suppose a point q1 is in the electric field & a unit positive charge q2 is at infinite distance ...
A: The way you phrase your question has problems - perhaps because of some concept you need to study. ...
|
| getting the work | 8/27/2006 |
Q: I'm thinking how I will be able to get the work required to fill the cylindrical tank with water if ...
A: I'm afraid there is a problem with your question. Work is defined as (F*cosTheta)*d - the product of ...
|
| Incandescent lamp surge | 8/25/2006 |
Q: I was once told that when you switch on an ordinary incandescent lightbulb from cold, you will get a ...
A: In most of my calculations, assume house power of 115VAC - the US standard. Calculations show (P = ...
|
| Projectile Motion | 8/24/2006 |
Q: I am currently doing a major project for Year 12 Physics, investigating projectile motion - in ...
A: This should be an interesting study for you. I refer you to the following Wikipedia pages. There are ...
|
| train on a track | 8/23/2006 |
Q: one more question please. A train is on a track going up a hill. It is accelerating. It has several ...
A: Interesting question - thanks for challenging my grey matter. Let the train have 20 cars. The 20th ...
|
| motion | 8/23/2006 |
Q: a person in an elevator drops a coin. It takes 6 seconds to hit the floor. Will the time increase ...
A: I'm a little puzzled that it takes 6 seconds to hit the floor. That means it fell 176.4 meters! Tall ...
|
| Coefficiet of restitution | 8/22/2006 |
Q: The first ball of mass m moving with a velocity u collides head on with second ball of same mass m ...
A: The problem doesn't mention whether the balls are rolling, sliding on a frictionless surface, or ...
|
| work | 8/20/2006 |
Q: A man walking/carrying a briefcase is NOT doing any work, how do you explain that? I believe that it ...
A: Work is displacement times force (or component of a force) in the direction of the displacement. If ...
|
| physics | 8/18/2006 |
Q: 1.which among the three methods(polygon method,1st condition of equilibrium for nonconcurrent ...
A: 1. Maybe I don't understand the question but it seems it's asking you to compare apples and oranges. ...
|
| newtons 3rd law | 8/17/2006 |
Q: I am writting with regard to something a friend told me. He told me that Newtons Law could be proven ...
A: Well, it is true that Newton's Laws are not 100% true in every condition. But discrepancies are only ...
|
| projectile motion | 8/17/2006 |
Q: why the result of projectile motion will be the same as long as the velocity of projectile is the ...
A: Say that you have a small cannon which uses compressed air to fire a metal ball the size of a tennis ...
|
| Pushy Load | 8/15/2006 |
Q: Let's say I want to push a very heavy load. Assume the load weights 1 ton. Is there any relevance in ...
A: Yes, there is relevance. Weight is directly related to mass (W = M*g), and mass is directly related ...
|
| canoes | 8/10/2006 |
Q: would a canoe sink in the ocean?
A: I've added a followup at the bottom. Canoes are required to float in fresh water even when capsized ...
|
| Light and more | 8/9/2006 |
Q: I am a bioengineering major (limited calculus-based, college level physics) studying for the MCAT, ...
A: I think I can help. 1. Remember, if you change the value of a resistor, either the voltage or the ...
|
| ultrasonics | 8/9/2006 |
Q: sir... can you explain the concept behind "magnetostriction oscillators using transistors"... ...
A: I'm afraid I don't have much for you. I had not heard of magnetostriction oscillation (at least not ...
|
| torue | 8/8/2006 |
Q: Please explain the term torque?how torque=rFsintheta(where r is a position vector and F is the force ...
A: When talking about linear motion, force causes acceleration according to the formula F = m*a. The ...
|
| X-husband | 8/7/2006 |
Q: I have been divorced 5 years. Now my X-husband wants me back in his life. I need to know if it ...
A: Sorry, this is outside my expertise. I am a physicist and deal with scientific facts - force and ...
|
| Pressure/thrust | 8/6/2006 |
Q: I have read that a body experiencing pressure from being under water experiences the force in all ...
A: Yes indeed, the pressure is due to the weight of the water above the body. But ... Let's look at ...
|
| Force, Acceleration and Flight | 8/6/2006 |
Q: Currently there are a number of my peers who have been debating why a person gets forced back into ...
A: Rather than give a 1 or 2 sentence answer I'd like to try explain the dynamics of take off so you ...
|
| motion in outer space (free from all outside forces) | 8/5/2006 |
Q: this has been bugging me for a while and is probably a really simple question but i really want a ...
A: I think I can clear this up for you. You may remember that there are 3 laws credited to Isaac ...
|
| building a mock street light | 8/4/2006 |
Q: HELP! I'm currently in college physics II and we are doing a gadget project. My group is making a ...
A: See followup added at the end. I think you suspect that you will need several more components. You ...
|
| Physical Science | 8/3/2006 |
Q: I'm Having Some troubles with some questions.. Just so u know your not doing all or even half of my ...
A: I inserted my response in the question. Sometimes, I don't know either. 1. When the molecules in a ...
|
| Questions about heat | 8/3/2006 |
Q: Steve, I am pressed for time. I have six months to finish my high school courses. Now, I resisted ...
A: I inserted my response on each question after choice D. I usually agree with your answer. You did ...
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| physic electricity and electronics | 7/28/2006 |
Q: 1. Suppose that you're facing a straight current-carrying conductor, and the current is flowing ...
A: You will find the answer to your question (and probably answers to several related questions you ...
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| how does a plane move forward | 7/27/2006 |
Q: Can u tell me how does a plane move forward? Is it by sucking the air from the front or pushing the ...
A: It is an application of Newton's 3rd Law. This is true whether the plane is propeller driven or jet ...
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| Movable Wings | 7/27/2006 |
Q: Greetings, Steve: My husband has a pair of wings that are worn for a costume piece, for ...
A: Without seeing the wings, it's hard to know whether ideas that I might have are feasible. The ...
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| physics light | 7/25/2006 |
Q: 1. an object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from ...
A: I'm sorry, Optics never interested me much so I've forgotten much of what I knew. A.Alexandropoulos ...
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| physical science sound | 7/24/2006 |
Q: 1.A surface receiving sound is moved from its original postion to a postiton three times farther ...
A: 1B. (I assume the sound is to be coming from a point source. If it's coming from a train rumbling ...
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| roller coaster in physics project | 7/21/2006 |
Q: My groupmates and I decided that it will be interesting to build a roller coaster for our physics ...
A: This should be a fun project. You can get a good discussion of roller coasters and many ideas from ...
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| particle fall (<1mm) | 7/21/2006 |
Q: a particle of 1mm fall from 10m in air 1. How many forces will work on it ? 2. Mathematical ...
A: OK Veerendra, I think I can work with that. To get the mass of the particle: Volume of sphere = ...
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| particle fall (<1mm) | 7/20/2006 |
Q: a particle of 1mm fall from 10m in air 1. How many forces will work on it ? 2. Mathematical ...
A: I need more information. Judging by your 4th question, we are not to ignore wind resistance. So it's ...
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| Calculating horizontal distance traveled by object | 7/19/2006 |
Q: Steve, Success! I finally get it. The program now accelerates accurately and reaches terminal ...
A: Congratulations on the successful program. I did some searches and found that the engine in the 2005 ...
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| Sorry this is the corrected link for static equilibrium problem | 7/18/2006 |
Q: The corrected one is located in this link http://www.box.net/public/i314x8r2v4 . Yeah the answer at ...
A: For the maximum horizontal force that the Block B's force of friction will be able to resist, I get ...
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| thyristor | 7/17/2006 |
Q: why is silicon used for constructing S.C.Rs and not germanium?
A: From Wikipedia (http://en.wikipedia.org/wiki/Semiconductor_device): "Making germanium of the ...
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| Physical Science Heat | 7/12/2006 |
Q: Can you please check to see if my answers are correct.Thanks Paula 1.A silver bar 0.125 meter long ...
A: 1. I agree with you. 2. I haven't been able to find the specific heat of coal. Working backwards ...
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| Calculating horizontal distance traveled by object | 7/12/2006 |
Q: Steve, Thanks for the detailed reply, its clearer now. You're correct in assuming I'd be going for ...
A: OK, I see that I wasn't as clear as I might have been in the paragraph discussing what I called "the ...
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| Resistance in wires | 7/9/2006 |
Q: if the resistance through a copper wire was lower than expected, why would that be? I know that if ...
A: Several possibilities come to mind that might explain a discrepancy of several percent error. But ...
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| changing mass in a helicopter blade | 7/9/2006 |
Q: If you had two contrarotating helicopter blades, rotating so as to have the torque placed on the ...
A: All other things remaining equal, yes the vehicle would begin rotating. It's a case of Conservation ...
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| Physical Science Sound | 7/8/2006 |
Q: Please Help! Need to know if my answers are correct. Can you please check if my questions are ...
A: I agree with you on questions 4, 11, 16, and 2. I disagree with you on question 6. The external ...
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| Calculating horizontal distance traveled by object | 7/7/2006 |
Q: Well, I'm actually writing a small program to simulate a car, so if F is variable, then I'll need to ...
A: OK, that sounds like an interesting challenge. Let me reply to the individual comments/questions ...
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| Calculating horizontal distance traveled by object | 7/6/2006 |
Q: Steve, I do understand that when Fnet = Fd, acceleration will be 0, however, if I solve for v = ...
A: So you don't have F and the other frictions? Sorry, I thought you did. The equation I thought you ...
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| Calculating horizontal distance traveled by object | 7/6/2006 |
Q: Here comes one of those questions you've probably heard a million times before, but I simply can't ...
A: I guess we assume the force the car is applying to the road is constant. But the drag is not ...
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| mobaile phone | 7/5/2006 |
Q: hai 1- what is the effect of a mobile phone on healthe?
A: James J. Kovalcin said in reply to a similarAs far as is scientifically known, the only way that the ...
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| Kinematics | 6/30/2006 |
Q: I got stuck with a question which says: A rocket when fired rises up with an acceleration of 20 ...
A: Please see followup added below. Hello Abhishek, There are some formulas that will be needed that ...
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| physics | 6/28/2006 |
Q: In physics the 'desire of an object to keep doing what it is doing ' is termed3iwn9
A: I'm sorry, I need to ask you to clarify. Notice that your question is garbled at the end. "it is ...
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| Regarding sound parabolas | 6/28/2006 |
Q: I am planning to build a sound parabola of my own. My purpose is record bird sounds and other ...
A: Good to correspond with another who appreciates birds. I assume that you want this to be a portable ...
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| Venturis | 6/26/2006 |
Q: just a quick question on venturis. I know the basics of how they work I just need a bit of advice. ...
A: Sorry I didn't have a quicker answer to your "quick" question. I refer you to the following ...
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| Physics | 6/25/2006 |
Q: I have 10 questions to answer and they all include equations. I have no Idea about anything in ...
A: I sense that you tell yourself that you can't, without trying. Don't believe that it's not feminine ...
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| reading comprehension | 6/23/2006 |
Q: I like to have some reading comprehension or text about physics. Regards
A: My main resources are my 40+ year old college texts and the web site wikipedia. I don't know the ...
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| Physics | 6/23/2006 |
Q: In which of the following units is acceleration expressed? A. Newtons B. Foot-pounds ...
A: First a bit of preaching: That's a long list of questions that look like homework. First I think ...
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| How Can I build a small 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 see that James J. Kovalcin has given you a good source for lenses. It will be for you to decide if ...
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| ELECTICITY AND ELECTRONICS | 6/21/2006 |
Q: COULD YOU CHECK MY ANSWERS ON THSES QUESTIONS AND SE IF I DID THEM RIGHT DID WAS HARD FOR ME.THE ...
A: I disagree with you on these. 5. If an electrically uncharged body is contacted by an electrically ...
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| time travel | 6/21/2006 |
Q: a car gets 25.0 miles gal/she plans to spend yr in europe/what should the cars average gas mileage ...
A: This is basically a problem in converting from one group of units to another. My high school physics ...
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| basic phisics | 6/20/2006 |
Q: Why is it difficult for a firefighter to hold a hose that ejects large quantities of water at a high ...
A: The force on the firefighter's hose is caused by the same principle as the toy balloon flying across ...
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| Torque | 6/19/2006 |
Q: Thanx for your answer.But the reason that why i am specificaly including torque is because of this ...
A: OK Sameer, now I see. The torque that is requested is the torque on the bar magnet (due to its ...
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| Seasons | 6/18/2006 |
Q: Hey there, quick question, i hope! Why is it cold and dull and the sun is low in winter? Hope you ...
A: To paraphrase your question, in the winter it is cold and dull >because< the sun is low. The web ...
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| 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: The common definition of work is force X the distance through which the force is exerted. A torque ...
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| Electric Cars | 6/16/2006 |
Q: "I hope I am asking the right person. If not, can you direct me to the proper "expert" to ask? ...
A: The wikipedia web site http://en.wikipedia.org/wiki/Electric_car supports your feeling that an ...
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| resistance doesn't slow down current in series circuit!? | 6/11/2006 |
Q: so what does resistance do to the current. I see from your analogy that it would not decrease, but ...
A: Resistance determines the amount of current. From Ohm's Law, I = V/R. So the higher the value of the ...
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| Physics | 6/9/2006 |
Q: I am back again with a confusing question?( for me at least ). A 12cm long rod has 2Kg weight ...
A: What must be done is find a pivot point such that the turning force, or torque, provided by the 2 ...
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| Car Crash Question | 6/8/2006 |
Q: If a car of a know weight, traveling at a known speed, hits a cow of a known weight, if you assume ...
A: There are still several variables to consider. Is the car a low profile sports car that might ...
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| Vectors | 6/8/2006 |
Q: I wanted to ask you... How are vectors used in weapons technology? With this I mean missiles, rocket ...
A: There are many vectors involved in the calculations controlling accurate course direction. The ...
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| car | 6/6/2006 |
Q: I hope I'm not a great bother to you; I guess I'm a little slow! original original Question - A ...
A: Don't worry, if you can take the time to explain your problem, I can take the time to try to solve ...
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| Electricity and Electronics | 6/5/2006 |
Q: When an electric current flows thru a long conductor, each free electron moves a. from one end of ...
A: You seem to know it's definitely not b or c. That's good. But, I think I'll choose d. The way the ...
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| vortex tubes? | 6/5/2006 |
Q: It just came to my attention that there are devices called vortex tubes that use compressed air to ...
A: I hadn't studied this topic until I got your question. One thing to point out: water is not ...
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| Oxygen and Heaters | 6/5/2006 |
Q: Do electric space heaters use up oxygen? ie. do they actually burn oxygen or is something else ...
A: No electric space heaters that I know of use oxygen. Electrical energy is converted directly to heat ...
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| car | 6/4/2006 |
Q: A question from the past pops up again! You saida truck's work horizontally states that if there was ...
A: [Before I get into the main point of your question, I need to clarify something. In your question ...
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| tropospheric reflection | 6/1/2006 |
Q: the radio waves are reflected from troposphere thorough blobs.What is its actual mechanism ?and why ...
A: I'm sorry but I don't know much about these topics. The following web sites should help you. ...
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| paradox for electricity | 6/1/2006 |
Q: The increasing brightness of the bulb is an indication that the temperature of the bulb filament ...
A: jeff, I'm sorry this is so late. I composed an answer and attempted to send it. I guess it got lost ...
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| MOSFET | 5/31/2006 |
Q: http://www.tpub.com/content/neets/14179/img/14179_162_2.jpg At the bottom of the p-type substrate ...
A: I perhaps should just say that this is outside my expertise and I can not answer. I have not been ...
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| resulatant | 5/31/2006 |
Q: Two 30.-newton forces act concurrently on an object. In which diagram would the forces produce a ...
A: There are 2 graphical ways I know of to figure the resultant of 2 vectors. Take the 2 vectors as ...
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| harp physics | 5/30/2006 |
Q: I was assigned a project to research the physics that occurs when playing a musical instrument (i.e. ...
A: I didn't find much explanation of the physics of harps. The 2nd website below may give you the most ...
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| HI,
The diagram below shows... | 5/29/2006 |
Q: The diagram below shows points A, B, and C at or near Earth’s surface. As a mass is moved from A to ...
A: The fact that the question asks for work done against gravity tells you to consider only the force ...
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| power | 5/28/2006 |
Q: A truck weighing 3.0 × 10^4 newtons was driven up a hill that is 1.6 × 10^3 meters long to a level ...
A: Followup added at end To compute power you had to calculate work and then divide by time. And yes ...
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| motion & magnetic field | 5/28/2006 |
Q: if there is a non magnetic non moving object , will it have a magnetic field if we move it? thanks
A: Counter-intuitive results have been shown in the field of magnetism. Magnetic levitation surprised ...
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| charges | 5/28/2006 |
Q: An object with a net charge of 4.80 × 10^–6 coulomb experiences an electrostatic force having a ...
A: I was with you at first. I thought perhaps there was a misprint in Barrons but finally I saw the ...
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| balloon jet/rocket? | 5/25/2006 |
Q: My name is Sandy and I am a freshman in Redondo Beach,CA. My teacher assigned us a project to design ...
A: The first thing I thought of is ... HYDROGEN??!! That's explosive - I hope you're not supposed to ...
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| What happens if unkowns>equations? | 5/25/2006 |
Q: I'm considering a square desk whose center of gravity is the geometrical center with four legs ...
A: It would be interesting to see your 3 equations. I'm not sure I understand the problem. I'm going to ...
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| Kinetic friction | 5/22/2006 |
Q: A person pulls his young daughter on a sled with a constant velocity on a level surface through a ...
A: You will need these 3 formulas. W(ork) = F*d. Gives the final result (F = Fkin). Fkin = ...
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| Physics (Mechanics, Heat & Sound) | 5/20/2006 |
Q: I need help really bad I have to be done with this in 4 days! I need to get these done with good ...
A: I can't answer 75 out of 75 questions for you. Looking at question 1, if you have any understanding ...
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| String Tension | 5/19/2006 |
Q: How come in the popular physics demo where there is a top and bottom string with a weight in the ...
A: It turns out that I don't know of that "popular" physics demo, but I think I can guess how it is set ...
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| physics (Motion) | 5/19/2006 |
Q: A body of mass 0.3kg moving with a velocity of 40ms-1 is brought to rest at a distance of ...
A: First, to compute the acceleration a (retardatioin in this case) you need a formula involving ...
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| MECHANICS | 5/18/2006 |
Q: AN OCEANOGRAPHER IS HAVING A BELL UNDER THE OCEAN AT 1 Km. THE DENSITY OF THE BELL IS 1020Kg/ cubic ...
A: There's a strange thing about your question. It's interesting that the density given for the bell is ...
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| equilibrium | 5/17/2006 |
Q: why do we keep our legs far apart when we have to stand in the aisle of a bumpy-riding bus?
A: Ah yes, the bumpy-riding bus problem. And even with our legs far apart, we sometimes have trouble ...
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| physics | 5/16/2006 |
Q: could u please Consider a device or devices and explain how Heat, Light, Sound and Electricity is ...
A: I'm well, hope you are too. The incandescent electric light converts electric energy to both light ...
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| Heat | 5/16/2006 |
Q: Can you describe how Heat can be Reflected, Refracted and Diffracted? Thanks
A: Heat energy is transferred in three different ways; conduction, convection and radiation. In ...
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| physics | 5/15/2006 |
Q: which of the following is true about magnetic field produced by a current in a long, straight wire? ...
A: If you check out this wikipedia page, you will find the answer. ...
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| Light | 5/15/2006 |
Q: Can you discuss the nature of Light and how it is affected by different media? Thanks.
A: Your question covers a very large topic. Pages 851 to 1107 of my 2nd year college Physics book cover ...
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| ring | 5/14/2006 |
Q: a ring of mass M and radius r turns in a vertical plane without friction about a horizontal axis ...
A: I see at least 2 ways to picture your question. I'll explain. Stick with me, OK? Let's start by ...
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| mechanics | 5/14/2006 |
Q: what is the effect on the speed of a fighter plane chasing another when it opens fire?what happens ...
A: Your question about planes shooting at each other is a question of conservation of momentum. (Unless ...
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| electrostatics | 5/13/2006 |
Q: A metal sphere has a net negative charge of 1.1 × 10^–6 coulomb. Approximately how many more ...
A: When a body has no electric charge the number of electrons equals the number of protons. These are ...
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| physics | 5/13/2006 |
Q: I am still stuck on this question am I suppose to use T=2*pi*square(1/(MgR))? the first question ...
A: Your formula isn't quite right. A good check if you're not sure of a formula is to check to see if ...
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| Mechanics | 5/12/2006 |
Q: why do we not fall down of a roller coaster even when it is upside down?
A: This is a question of momentum and centripetal force. I'd like to start by discussing another ride ...
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| Theoretical question on relativity | 5/12/2006 |
Q: Consider a train , its proper length = 375000 km , traveling at a speed of 180000 km/sec (0.6 of ...
A: Your question reminded me of one of the reasons that I switched to Engineering for my advanced ...
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| current | 5/11/2006 |
Q: I just saw a program on the tv5 it is a educational program in denmark. A man on the tv said that if ...
A: If I understand your description of the situation, you might have misunderstood the tv program. Is ...
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| I can't solve this 2 problems:
A... | 5/11/2006 |
Q: I can't solve this 2 problems: A heavy, homogenous ball has mass M and radius R. the ball is ...
A: I'm sorry, I can't get a clear picture of the situation. Let me describe what I think it might be ...
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| A question i'm having trouble answering | 5/9/2006 |
Q: What is the gravittational force exerted on a 35 N baby by the 650 N maternity nurse as it's being ...
A: Newton's law of universal gravitation says that the force between any two mass particles, m1 and m2, ...
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| Heat | 5/6/2006 |
Q: Physical Science student Estella uses an electric tea kettle to disinfect her apartment freezer with ...
A: I like this question. This was a topic early in my first year of Physics, and I still remember Mr ...
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| 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: I have replies for questions 1-4. When you give the details (rear end of what?) about the crash in ...
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| A few Physics Questions | 5/3/2006 |
Q: 1.In a stringed musical instrument the sound frequency of a particular string can be increased by ...
A: Sorry that I needed to send a followup but a detail in my discussion of question 4 needs revision. ...
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| electromagnetic headphones fluctuations | 5/1/2006 |
Q: If you have , say, a 80 hz signal going through headphones of the type that have neodymium magnet ...
A: I will give your question a shot, but I can't claim to be an expert in audio subjects. I've never ...
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| light dependent resistor | 4/30/2006 |
Q: I'm revising for my GCSE Physics, and I'm still not sure about the uses of LDRs.. In bright light, ...
A: Your logic is correct, you're just not aware of some of the tricks circuit designers can use. An ...
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| light ray | 4/29/2006 |
Q: I hope I'm finding you in the best of health. A ray of light goes from air into Lucite then back ...
A: How have you been - studying light now I see. I don't think your figure appears at my end the way ...
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| 1.a particle moves at a speed... | 4/28/2006 |
Q: 1.a particle moves at a speed of 2.5 m/s in the +x direction upon reacing the origin theparticle ...
A: 1. The particle will continue to have the +x velocity, so 4 seconds after passing the origin it will ...
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| When an electric current... | 4/27/2006 |
Q: When an electric current flows through a long conductor, each free electron moves A. from ...
A: An example in my old Physics book says that in a copper wire carrying 10 amps, the drift speed of ...
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| electricity and electronices | 4/27/2006 |
Q: six questions I NEED HELP 1. If one body is positively charged and another body is negatively ...
A: 1. This seems like an incomplete question. If there is a conductive path between the bodies, or if ...
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| physics | 4/26/2006 |
Q: CAN YOU HELP ME WITH THESE 8 QUESTION 1. In which of the following units is acceleration expressed? ...
A: See followup added at the bottom. It might be better for you to know where in your book to look for ...
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| Wind resistance and running | 4/25/2006 |
Q: Steve, your knowledge is incredible! Most impressive. Your answer was very helpful! In my ...
A: OK, that's some interesting data you have there. I noticed something interesting. You converted the ...
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| logic gates | 4/24/2006 |
Q: I reacently learned about truth tables and logic gates. I was wondering if you can reverse the truth ...
A: I'm sure that there is a systematic way to determine what gates provide the given truth table. ...
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| 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: This is an interesting question. There will be many approximations and hedges in my response. The ...
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| newtonian mechanics | 4/22/2006 |
Q: I always learnt that friction opposes motion except by centripetal acceleration[why doesn't friction ...
A: I think now I see the cause of your problem. You are right that friction opposes motion. And I will ...
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| newtonian mechanics | 4/21/2006 |
Q: A manufacturer's advertisement claims that their 1,250-kilogram (12,300-newton) sports car can ...
A: I went through the math and verified the statement that a force of 8940 N is required to accelerate ...
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| Newtonian mechanics | 4/21/2006 |
Q: Tell me the difference between angular acceleration,centripetal acceleration,cercular acceleration.I ...
A: I hope you're old enough to know about vinyl phonograph records, the primitive music storage disks ...
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| Advance Vector. | 4/20/2006 |
Q: Where can I learn more about those various law of vector from basic to advance, free, on the ...
A: A yahoo search with the criteria "vectors resultant component addition" (without the quote marks) ...
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| magentism | 4/18/2006 |
Q: I hope I'm finding you in the best of health,as always. A diagram represents a straight conductor ...
A: Yes, I'm well, and you? I agree that the wire needs to be moved into the page. (Or out from the ...
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| circuits and resistance | 4/17/2006 |
Q: I hope I'm finding you in the best of health,as always. How does resistance affect a circuit?Without ...
A: Yes, I am well thank you. I hope you are also well. I think it would be good to discuss the light ...
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| question about forces and acceleration | 4/16/2006 |
Q: i am a tennis player . since a force is an acceleration multiplied by a weight M , can we say that ...
A: Ahh yes, the Physics of hitting a ball is complex. First let me point out: for our discussion this ...
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| electromagnetic induction | 4/12/2006 |
Q: For which to angles between the direction of motion of a wire and a magnetic field can a potential ...
A: I'd like to be able to show you a picture but I'll have to describe my picture. Let's say that in ...
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| resistance | 4/12/2006 |
Q: I hope I'm finding you in the best of health. Here is a quote from my book that i don't completely ...
A: Good questions. You're thinking about what you're reading. Let me start with question #2. Have you ...
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| Gravity | 4/5/2006 |
Q: I am an amateur researcher now days researching the subject of gravity during this research I have ...
A: I also enjoy watching birds soar. How do they do it? I don't think they are defying gravity. They ...
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| normal force | 4/1/2006 |
Q: Like you, I am retired (from a career in law) and am now spending my time studying physics on my ...
A: You are right that because of gravity, the object will exert a force equal to its weight downward ...
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