| Subject | Date Asked |
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| Force and Gravity | 11/21/2009 |
Q: 1.When an object is at rest, it has a weight. W=mg, When we push an object, the object is in motion ...
A: I think I understand your question now. As you mentioned yourself, while the earth orbits the sun, ...
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| dielectric | 11/21/2009 |
Q: F=-du/dx=-(1/2)*Q^2*d*[-(1-k)]/έ0*W*[x+k(l-x)]^2 how can i find frequency? i wounder if you ...
A: Sorry for not getting back to you, I've been very busy lately. The truth is, finding the frequency ...
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| Force and Gravity | 11/17/2009 |
Q: 1.When an object is at rest, it has a weight. W=mg, When we push an object, the object is in motion ...
A: Good questions. Although I find question 2 a bit confusing. First about question 1. I understand ...
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| dielecric | 11/14/2009 |
Q: i 'm really sorry for not paying attention carefully. any way i derivative from it but even now i ...
A: God job! By the way, you DID find "F" as a function "x" ...
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| capacitor | 11/11/2009 |
Q: you ve asked me to answer what is the U(x). C1=έ0A/X for empty part ,and C2=έ0A/k(L-X ) ...
A: There are three lenghts: One of them is d = the distance between the plates (thickness of the ...
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| capacitor | 11/11/2009 |
Q: you ve asked me to answer what is the U(x). C1=έ0A/X for empty part ,and C2=έ0A/k(L-X ) ...
A: You're on the right track! And yes, you can suppose that these 2 parts are like 2 parallel ...
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| capacitor | 11/9/2009 |
Q: you mean that i must use U=1/2(kx2) and differentiate from it so its result is F=-kx but we knew ...
A: No, obviously you can't use U=1/2(kx2), cause that would be assuming beforehand that the capacitor ...
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| capacitor | 11/8/2009 |
Q: i am really sorry for typing badly and i hope i could tell my question better than before. if we put ...
A: You have to find dU/dx NOT ΔU/Δx because they are not equal unless the force is constant ...
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| capacitor | 11/8/2009 |
Q: i am really sorry for typing badly and i hope i could tell my question better than before. if we put ...
A: OK Sanaz, I think I understand your question now. In the problem they don't ask you for the ...
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| capacitor | 11/7/2009 |
Q: i am really sorry for typing badly and i hope i could tell my question better than before. if we put ...
A: I'm still confused about the question. Please let me know: Do you put the dielectric, and then ...
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| physics | 11/5/2009 |
Q: can the resultant of two vectors of the same magnitude be equal to the magnitude of either of the ...
A: The answer to your question is yes, it can. The figure I attach shows an example of this. Vectors A ...
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| How does sound travel | 11/3/2009 |
Q: My question is how does sound travel through the air? Is it like a radio wave? And is sound inside a ...
A: Yes, you always use I0=1*10^-12 W/m^2 in the formula. ...although of course this number does not ...
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| How does sound travel | 11/2/2009 |
Q: My question is how does sound travel through the air? Is it like a radio wave? And is sound inside a ...
A: Decibels (dB) are a measure of sound intensity, but on a logarithmic scale. The formula is: dB = ...
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| Quantum Mechanics | 11/2/2009 |
Q: Consider a particle in a 1-D box with impenetrable walls at x=0 and x=L. Then the eigen function for ...
A: Good question! I can tell you have put some thought into it. Your solution and reasoning are ...
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| multiverse | 11/1/2009 |
Q: I finsihed reading Brian Green's book where he discusses a Multiverse (many universes) and it ...
A: I don't really know anything about Multiverses and I forgot what Brian Green's book says about ...
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| How does sound travel | 10/26/2009 |
Q: My question is how does sound travel through the air? Is it like a radio wave? And is sound inside a ...
A: No, sound waves and radio waves have a different nature. Radio waves belong to a type of waves ...
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| physics(electrostatics) | 10/24/2009 |
Q: am stuck on a question, hav gotten one part but cant seem to know were am to go from here. d ques ...
A: The best way to answer your question would be using a diagram. Unfortunately I don't have the means ...
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| General Physics | 10/20/2009 |
Q: I am a high school junior, and I am taking a high school regents level physics course this year. I ...
A: A sphere is a mathematical model to which we usually "fit" to many shapes that occur in nature (like ...
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| Potential U(x) | 10/17/2009 |
Q: Why we can express the potential U(x) in a Taylor series about a certain equilibrium point? Ex. ...
A: You can express any continuous and differentiable function about any point using a Taylor series ...
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| Physic Laws | 9/26/2009 |
Q: I have a very simple question. What is the criteria to be classified as a law? Why is the law of ...
A: A law is a statement that expresses a fundamental principle of science. To qualify as a law, this ...
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| action/reaction | 9/25/2009 |
Q: 1. In a generic case of a mass point and an extended body to interact with gravitational force, the ...
A: Being rigorous, every point of the extended body interacts with the point mass. You can model this ...
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| Why do orbits decay? | 9/17/2009 |
Q: My brother and I were talking about the Hubble Telescope. During that conversation we both wondered ...
A: You are right, in order for an orbit to decay, the object must lose kinetic energy. Normally this ...
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| Vectors | 9/16/2009 |
Q: How can I find the range of a cannon if I know its initial velocity assuming that it is set to an ...
A: If the height of the cannon is the same as the height of the point where the ball lands (the cannon ...
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| about are lesson i repport it tommorow | 9/10/2009 |
Q: what is the meaning of contact and field force? pleas give some example!
A: I believe "contact force" is the electrosatic repulsion force that arises when two objects are in ...
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| what is this physics law called and how does it work | 9/9/2009 |
Q: if i can remember back years ago...there is a law that if there is an object (let's say a wall) and ...
A: Well, the opposite is definitely true. There is a force that makes objects attract each other, it's ...
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| what is this physics law called and how does it work | 9/9/2009 |
Q: if i can remember back years ago...there is a law that if there is an object (let's say a wall) and ...
A: As far as I know, aside from air resistance (which, in principle, would have nothing to do with the ...
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| physics | 9/8/2009 |
Q: Could you help me give a mathematical explanation on the Conservation of Angular Momentum?
A: The conservation of angular momentum is a consequence of Newton's Second Law, which can be written ...
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| quantum | 9/7/2009 |
Q: I'm reading a book by Paul Davies and I just want to clear something in my own mind. I understand ...
A: I am not quantum mechanics expert but all I know is, yes, it looks like under a particular ...
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| The Math of Physics | 9/2/2009 |
Q: I am self teaching. Unfortunately I have issues which make it impossible for me to attend school at ...
A: Wow, I admire your enthusiasm and determination! Good for you! OK, first of all my advice is that ...
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| dielectric | 9/1/2009 |
Q: why the presence of dielectric decreases the coulomb`s force? charges are also present in dielectric ...
A: Sorry Seep, it looks like I misread your question and actually gave you a wrong answer. A ...
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| dielectric | 8/29/2009 |
Q: why the presence of dielectric decreases the coulomb`s force? charges are also present in dielectric ...
A: The presence of a dielectric DOES NOT decrease the Coulomb force (if by this you mean the force ...
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| another question | 8/27/2009 |
Q: .why magnetism arise in a conductor carrying current? what is the phenomenon involved in it? ...
A: OK, I think I understand better now. Thanks for clarifying. For question 1, Brownian motion is the ...
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| PHYSICS maxwell's electromagnetics | 8/27/2009 |
Q: in Maxwell's equation of Faraday's law : "curl(E)= -dB/dt" . It is well known that the right side of ...
A: Update: John, I've done a little revision of Faraday's Law of induction and I hope I can give you ...
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| magnetism | 8/26/2009 |
Q: .why magnetism arise in a conductor carrying current? what is the phenomenon involved in it?
A: Magnetic fields (magnetism) are created by moving charges. There is no explanation beyond that: ...
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| PHYSICS maxwell's electromagnetics | 8/25/2009 |
Q: in Maxwell's equation of Faraday's law : "curl(E)= -dB/dt" . It is well known that the right side of ...
A: As far as I know the implication works both ways. If you measure a curl in E, there must be ...
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| Time | 8/23/2009 |
Q: Does time have a defined speed, not relative to any interaction?
A: I'm not sure if you are aware of it but that is an very profound question, in the sense that there ...
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| Please help me with solving this physics question. | 8/21/2009 |
Q: Calculate the time it takes a plane travelling at a constant tangential speed of 110m/s to fly once ...
A: Before I get to your question, I should let you know that my policy is not to give full solutions to ...
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| Energy Comparison | 8/20/2009 |
Q: Can you tell me how I would find the answer to establishing how many ltrs of compressed air at say ...
A: I would advise you to ask someone in the Thermodynamics field on Chemical Engineering. An expert ...
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| Energy Comparison | 8/19/2009 |
Q: Can you tell me how I would find the answer to establishing how many ltrs of compressed air at say ...
A: Vince, I'm sorry but your question still doesn't make a lot of sense to me. First of all, I'm not ...
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| Energy Comparison | 8/19/2009 |
Q: Can you tell me how I would find the answer to establishing how many ltrs of compressed air at say ...
A: I'm not sure I understand your question. When you say "equal", what do you mean exactly? Equal in ...
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| Thermal Physics | 8/18/2009 |
Q: I have spent time trying to understand and answer the following question. Would you be so kind to ...
A: Before I get to your question, I should let you know that my policy is not to give full solutions to ...
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| forces and friction question. | 8/16/2009 |
Q: Montiel, I hope you are well. My name is Ken and live in Calgary.I have an assignment question that ...
A: Everything you wrote down looks correct to me. I tried to solve the problem on my own and I think ...
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| roulette | 8/14/2009 |
Q: Hy, I have a question regarding the roulette. How can we calculate the ball circulation? Which ...
A: This is a very interesting question. You could say that the ball on the roulette is subject to many ...
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| physics | 8/13/2009 |
Q: I'm rusty at this. The formula for free fall motion I'm told is d = 1/2at2 (can't find the ...
A: First, let me give you a tip for future reference. There is no superscript for "squared" on the ...
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| charges | 8/12/2009 |
Q: i wanted to ask that why in a capacitor the charges are not neutralised when there is no dielectric ...
A: I'm going to assume that by "neutralised" you mean that there is no longer a net charge in any of ...
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