| Subject | Date Asked |
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| Ultrasonic cleaning | 3/18/2008 |
Q: My question on ultrasonic cleaning:1) The ultrasound transducer is embedded at the bottom of the ...
A: Raymond, 1) The whole object will be cleaned even though cavitation bubbles are coming from the ...
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| Insulation | 1/12/2008 |
Q: Okay, I know that some materials are better for insulating hot drinks and others are better for cold ...
A: Sanovia, When you have a hot liquid you want to prevent its heat from escaping out into the ...
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| physics | 10/14/2007 |
Q: how are the static force of friction and the kinetic force of friction different?
A: Amanda, To move a body which is at rest you need to apply some force to it. As you keep increasing ...
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| How many watts-per-meter-squared is 1-photon-per-second if the photon is a 2 GHz radio wave? | 10/12/2007 |
Q: How many watts-per-meter-squared is 1-photon-per-second if the photon is a 2 GHz radio wave? ...
A: Green, A photon has an energy given by the equation E=h*f where E is the photon's energy h is ...
|
| physics | 9/30/2007 |
Q: why desert nights are colder whereas the days are very hot
A: Jamali, There a few reasons why days are hot and nights cold in a desert 1) Desert air has ...
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| How aquarium pumps work | 9/24/2007 |
Q: I would like to find out more about how aquarium pumps work. You know the ones that use air bubbles ...
A: Boonlay, Below are 2 articles which may help answer some of your questions. ...
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| Physics | 9/23/2007 |
Q: How to build a simple robot related to Physics because I like to build robots?
A: John, There are may robot kits available at a store called fry's. The kits range from a beginner's ...
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| soundless drilling | 9/21/2007 |
Q: please tell me how to drill holes in hard stones without any sounds.i want break very big rocks ...
A: Vinay, Here's a website which sells the sound absorbing sheets/material. ...
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| soundless drilling | 9/20/2007 |
Q: please tell me how to drill holes in hard stones without any sounds.i want break very big rocks ...
A: Vinay, You could try a couple of things:- 1) Try laser drilling. You will have to research what ...
|
| supercooling water | 9/17/2007 |
Q: remember me? im just wondering i tried the experiment: i put distilled water, without opening the ...
A: Snapfreeze, Water (distilled or not) if cooled to 0 deg celcius will freeze. Thats not a surprise. ...
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| physics | 9/12/2007 |
Q: why All sorts of motion, mechanical or otherwise dissipate in heat ? please explain in detail .
A: Vaibhav, Every machine that does work on a system is inefficient i.e. some of the work energy is ...
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| Water and Floating Bodies | 6/28/2007 |
Q: If I were to build a bridge to carry water that will transport ships and barges, would I need to ...
A: Karl, In your experiment the basin was enclosed on all sides and the displaced water had nowhere ...
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| Escape Velocity | 6/27/2007 |
Q: I assume that any craft flying towards space will escape the earth's gravitational pull once there's ...
A: Karl, Irrespective of the amount of fuel in the rocket it needs to have a velocity greater than ...
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| EM waves | 6/17/2007 |
Q: helo sir 1)Light is an EM wave. I want to know how are X rays , Infra red rays, Radiowaves and ...
A: John, 1) The sun is a massive nuclear fusion reactor where hydrogen atoms fuse into helium atoms ...
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| Pen_problem | 6/14/2007 |
Q: I have some bolt-point pens which are not writing,which were bought some time ago.please give me ...
A: Chanuka, Here are a few things you can try to get the pen to work 1) Scribble circles on ...
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| Gravity via Radiation Pressure? | 5/5/2007 |
Q: I do not know if this is your area of expertise, but I still think that you can contribute since you ...
A: Sam, A theory is considered reasonable if 1) It can explain current phenomenon 2) It can predict ...
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| COLOUR OF QUARK | 5/4/2007 |
Q: we all know that quark occur in 3 colours/anticolours they are combined to each other by gluons ...
A: Mohit, Glueballs are particles made only of gluons. They don't bind to quarks. Glueballs are ...
|
| Different type of light | 5/3/2007 |
Q: Ok so if I get a crystal and let light through it it becomes all diffreent colouts. What I read ...
A: Milt, The time , t, that it takes for light traveling at a speed c to travel a distance d is given ...
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| Different type of light | 5/1/2007 |
Q: Ok so if I get a crystal and let light through it it becomes all diffreent colouts. What I read ...
A: Milt, Light is a form of electromagnetic radiation which travels with a speed C. This c is related ...
|
| Sample of Physics investigatory project | 4/30/2007 |
Q: would you give me a sample of physics investigatory project? What are the topics that are included ...
A: Paolo, There are hundreds of topics that you could choose as your physics investigatory projects. ...
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| Time Travel concept | 4/28/2007 |
Q: I am curious about Time Travel. I have read and seen material on the topic. Most tend to sway to the ...
A: Mark, I dont understand as to how you would be able to create any type of "field" by having an ...
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| Time Travel concept | 4/26/2007 |
Q: I am curious about Time Travel. I have read and seen material on the topic. Most tend to sway to the ...
A: Mark, Something similar to what you are proposing had been proposed by Frank J. Tipler of Tulane ...
|
| Photoelasticity | 4/26/2007 |
Q: I have just renovated my house by a builder and install some new windows. I found at night time when ...
A: Peter, No harm in asking the builder for a free replacement. I do not know if this can be ...
|
| Photoelasticity | 4/25/2007 |
Q: I have just renovated my house by a builder and install some new windows. I found at night time when ...
A: Peter, Whenever light reflects off or passes through something with many small ridges or scratches, ...
|
| Time | 4/23/2007 |
Q: I really don't know if you could help me with this question, but maybe you know who can. I have ...
A: Susan, a day is the time that it takes for the earth to complete one rotation about its axis. This ...
|
| Wave | 4/22/2007 |
Q: I have two questions: Is it true that energy may move from one end of a spring to the other? If it ...
A: Farhan, energy is transported in the form of a wave. A slinky is a classic example of such a case. ...
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| The Physics of a Car Accident | 4/20/2007 |
Q: My question is pretty involved and I am not sure if it has a definite answer, but I am desperate, ...
A: Jamie, There are too many unknowns to say with any certainty as to what the speed of the van is. ...
|
| magnetic force | 4/17/2007 |
Q: we know that magnatic force acts on a moving charge; But how come it acts in the direction of the ...
A: King, This is a very interesting question. Here's one way to look at it. We know that a magnetic ...
|
| general relativity | 4/16/2007 |
Q: My question is about the gravitational field surrounding an infinitely long thin rod with a ...
A: Jeff, Iam not an expert in this field and you may be better off asking an expert who is an expert ...
|
| Lab Report | 4/14/2007 |
Q: I did on experiment to determine the coefficient of friction of wood on wood. So now I am writing a ...
A: Farhan, A Hypothesis, by definition, is a suggested explanation for a phenomenon, in your case that ...
|
| Egg Drop | 4/14/2007 |
Q: How can I make an egg drop box that won't crack the egg inside? My thought is using Newton's first ...
A: Otto, I have answered this question for someone else previously. Also, if you go through the ...
|
| magnetic colliders | 4/12/2007 |
Q: I have been reading about magnetic colliders on the Internet, listening to people talk about them on ...
A: David, Colliders are essentially particle accelerators where two beams of particles are accelerated ...
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| Electricity | 4/10/2007 |
Q: I am having trouble solving a question from a past AP exam (studying for the exam in May!). The ...
A: Peter, You need to find the net electric field at point C because of the charges at points A and B. ...
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| friction | 4/8/2007 |
Q: We say friction acts in opposite direction that of motion of object. Suppose we consider a car ...
A: Asp, Interesting question. For the wheels to get any traction and move in the forward direction ...
|
| Mountain Bike | 4/7/2007 |
Q: Can u tell me which tire tread design is appropriate for mountain bikes and why it is appropriate in ...
A: Farhan, On dirt roads, you typically will need wider, thicker tires for better traction and shock ...
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| Mountain Bike | 4/6/2007 |
Q: Can u tell me which tire tread design is appropriate for mountain bikes and why it is appropriate in ...
A: Farhan, Mountain bikes typically require extra traction and shock absorption. Hence they should ...
|
| dynamics - Earth's Orbit | 4/5/2007 |
Q: My husband & I started this discussion about the large population of China. My question is: if every ...
A: Jacqui, The earths mass is so huge that even if the entire population of the world came to one ...
|
| Electricity | 4/4/2007 |
Q: I have a question about lightbulbs and circuits. If you have a circuit with three lightbulbs, and ...
A: Julianne, The bulb is rated at 120V i.e. it need 120V to give out light and also its rated at ...
|
| Sound/Intensity | 4/4/2007 |
Q: I was wondering if you could help me with the following question, which came up in my physics class ...
A: Peter, 1) Intensity of sound follows an inverse square relationship. i.e. if the distance is ...
|
| career | 3/30/2007 |
Q: What are the career options with subjects like physics, maths and computer applications but no ...
A: Tanya, Some of the career options are :- 1) Consulting 2) Various aspects of engineering including ...
|
| physics | 3/30/2007 |
Q: when we heat any liguid with some floating substances put in the liquid there is some force arising ...
A: Saad, U235 is one of the few nuclei which is fissionable, i.e. if this nuclei is bombarded with ...
|
| Frequency reponse | 3/28/2007 |
Q: I was wondering does the frequency response in human decrease as you get older, if so y? ANSWER: ...
A: Chad, If a person suspects that they are unable to hear well then they can go in for an audiogram ...
|
| Frequency reponse | 3/28/2007 |
Q: I was wondering does the frequency response in human decrease as you get older, if so y?
A: Chad, Humans can hear sounds at frequencies from about 20Hz to 20,000Hz. As we grow older, our ...
|
| newton's law of cooling | 3/27/2007 |
Q: taking newton's law of cooling into consideration, (basically objects cool/heat faster when the ...
A: Jenna, You are correct in your definition of newtons law which states that the rate of change of ...
|
| physics | 3/27/2007 |
Q: when we heat any liguid with some floating substances put in the liquid there is some force arising ...
A: Saad, When you heat any liquid, you start generating a convection flow which spirals towards the ...
|
| 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: Stuti, A fuse is an overcurrent protection device which acts essentially like a switch. In your ...
|
| Reflection of Light | 3/18/2007 |
Q: When a light ray hits a material of higher refractive index, when the ray is reflected, the phase is ...
A: Simon, Light is an electromagnetic wave. To find out what happens to a light wave when it goes from ...
|
| receivers | 3/18/2007 |
Q: What do the terms homodyne receiver, heterodyne receiver, intradyne receiver stand for? (please ...
A: Maki, The sampling frequency defines the number of samples per second taken from a continuous ...
|
| receivers | 3/17/2007 |
Q: What do the terms homodyne receiver, heterodyne receiver, intradyne receiver stand for? (please ...
A: Maki, In receivers, the Frequency Modulated (FM) radiation is detected using non-linear mixing with ...
|
| third law | 3/12/2007 |
Q: this is regarding Newton's third law. 1)When we are standing or sitting on ground, our weight is ...
A: Katrina, 1) The net force acting on us is our weight in the downward direction and the reaction ...
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| mass energy equation | 3/12/2007 |
Q: before u read the questions i apologise for asking so many detailed questions. bUt please do reply. ...
A: John, You ask questions which cant even be answered properly by using quantum mechanics and ...
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| physics | 3/7/2007 |
Q: please answer the following questions related to simple machine 1. how does friction reduce the ...
A: Sarita, 1) The efficiency of any machine measures the degree to which friction and other factors ...
|
| physics | 3/3/2007 |
Q: By Newton's third law every action has an equal and opposite reaction. Then, According to this law ...
A: Sarita, The 2 forces act on different bodies. Thats why the forces don't cancel out. There is a net ...
|
| Physics in the car | 3/2/2007 |
Q: I am interested in finding out how Newton's three laws apply to the car? Thank you so much, Ash
A: Ash, 1) when you are cruising at a constant speed of 60 mph in your car, there is no net force ...
|
| Modern Physics | 3/1/2007 |
Q: Explain me about modern physics in few sentences?
A: Neelima, Modern is a relative word. What is modern today will be old news tomorrow. However, ...
|
| physics | 2/27/2007 |
Q: which has the greater momentum, a heavy truck at rest or a moving roller skate?
A: Nicholas, Momentum is the product of the Mass of a body and its speed. A heavy truck has a mass ...
|
| A Question on Speed | 2/26/2007 |
Q: My whole life, I have been full of stupid questions, and this is one that I never have had answered, ...
A: Jesse, The fact that you ask questions is the important thing. Keep at it. I did a finger flicking ...
|
| Physics | 2/26/2007 |
Q: could you please derive the equation a=w^2r
A: Chad, The equation that you want derived is a = r * (w^2) where a is the radially directed ...
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| free fall and weightless ness | 2/25/2007 |
Q: what is the difference between free fall and weightlessness
A: Dillion, When a body is in "free fall", the only force acting on it is the force of gravity ...
|
| a practical joke from a few years ago. | 2/19/2007 |
Q: would this "mercuric thiocyanate" get hot if it came into contact with silver foil?.if it did, that ...
A: Rod, I looked up the MSDS (Material Safety Data Sheet) for mercuric thiocyanate and couldn't find ...
|
| sending a potato chip through the mail | 2/18/2007 |
Q: do you have any ideas on how to engineer the package/box to have the smallest volume and smallest ...
A: Hedge, A couple of ideas: 1) You could place the potato chip in a lightweight circular thin box ...
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| physics | 2/18/2007 |
Q: why does it become warmer during snow storm?
A: Sarita, Besides volunteering to answer questions, I also have a full time job. Also, I want to make ...
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| a practical joke from a few years ago. | 2/16/2007 |
Q: in the early 80s you could buy a practical joke which was a small white cone that you lit and it ...
A: Rod, The only thing which resembles what you have described was the snake firework pellet which ...
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| physics | 2/16/2007 |
Q: I have great respect for your knowledge. However, you felt that you were not an expert on this. May ...
A: David, Thanks for your patience. I have read Dr. Gorts. reply to you. I agree with his statements ...
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| relativity and time dilation | 2/16/2007 |
Q: For me, time dilation is throwing up a very difficult paradox. When one rocket is moving at 60% the ...
A: John, Since both rockets are in inertial frames(i.e. unaccelerated frames), it is equally correct ...
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| Physics- Refraction Of Light | 2/11/2007 |
Q: For the same angle of incidence, the angles of refraction in three different medium X, Y and z are ...
A: Deepak, I typically do not answer "homework" type problems. You should be able to find the answer ...
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| physics | 2/10/2007 |
Q: Is it feasible earth could produce "earth flares?" Like "solar flares" but these might glow cold ...
A: David, Iam not an expert on this topic but will try and answer. 1) A solar flare, by definition, ...
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| Two - wheeler balancing | 2/7/2007 |
Q: I have always wondered how a two wheeler like bicycle, motorcycle gets balances itself while moving ...
A: Mohan, For an object to be in static equilibrium i.e. to be balanced, it must have a large support ...
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| inertial reference frames | 2/7/2007 |
Q: I know that an “inertial reference frame” is defined as one in which the law of inertia applies. ...
A: David, You are correct. An inertial reference frame does not accelerate i.e. it is either ...
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| physics | 2/5/2007 |
Q: why is it generally said that only non conducting bodies can be charged to develop static ...
A: Sarita, It is NOT TRUE that conductors can't be charged. Normally static experiments typically ...
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| physics | 1/26/2007 |
Q: do different colors absorb heat differently?
A: The color of an object depends on two things 1) The frequencies absorbed by the body and 2) The ...
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| free fall | 1/23/2007 |
Q: is it possible for one to say that an object moving vertically downward can accelerate less than the ...
A: Stephanie, An object moving vertically downward can experience a NET acceleration less than g ONLY ...
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| Bathtub drain | 1/22/2007 |
Q: I have always been told that draining water in the northern hemisphere always rotates ...
A: Mace, There is a force called the coriolis force which can influence the way that water drains in ...
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| Equations | 1/22/2007 |
Q: What is the formula for area given the pressure and force?What is the relationship between force ...
A: Jessica, 1) Pressure, P, is defined as the Force, F, divided by the Area, A i.e. P = F/A This is ...
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| relativity | 1/19/2007 |
Q: Lenght contraction and time dilation in Special Relativity is puzzling me greatly. This is what I ...
A: John, The reason that time dilation experiments usually use a light clock arranged perpendicular to ...
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| lifting/suspending | 1/18/2007 |
Q: can a chandelier be installed by lifting it and mounting it just by its wires? if it were to fall ...
A: Richard, Interesting question. Lets consider a chandelier hanging by a rope from the ceiling. The ...
|
| Mass | 1/8/2007 |
Q: The average density of the material in intergalactis space is approx. 2.5*10^-27 kg/m^3. What is the ...
A: Robert, You are correct. You can use the formula Density=(Mass)/(Volume) to solve this problem. ...
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| Weird touch-sensitive lamps | 1/7/2007 |
Q: When my family woke up this morning, we found that all of our touch-sensitive lamps had been turned ...
A: Sam, Let me assure you that there are no ghosts at work here! Here is the answer to your question. ...
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| science | 1/4/2007 |
Q: what is spectrometer
A: Iyas, A spectrometer is an instrument which can be used to 1) Measure properties of light like its ...
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