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    Some Questions pestering me , Help!

    And yeah, an ac does produce electromagnetic waves...
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    Laws of the universe

    There are certain laws that govern this universe of ours. for example - the universal law of gravitation, the maxwell's laws and in case it does exist, the TOE... Now consider a universe as a set of laws. So if we give any random set of laws, it uniquely defines a universe. There can of course...
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    Why is the sky blue again?

    hey hey! can someone answer this please - why is the sun red in the evening? isn't THAT also because of scattering? why does scattering sometimes prefers red and sometimes blue?
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    Balance CM

    'angular moments'! LOL!
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    While loop in C

    user_choice = 1 while (user_choice == 1) { program code; ask "what do you want to do (1 for repeat 2 for exit)"; scanf into user_choice; }
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    Heat produced on shaking

    I could not quite keep track of the algebra you have done, but I donot agree with the final result you got. Well, I am now myself confused about why we are conserving energy. But assuming that the total KE of the molecules DOES remain constant in the full process, we can do the following :-...
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    Surprising physics

    My mistake. i think I did not explain the question properly. When I said that you are sliding the rod slowly, I meant that you are sliding it very little and then leavin it to see what happens to it. The forces that I have listed are the forces acting on it in this situation, i.e., when you...
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    Heat produced on shaking

    Hey are you all Indians here like me? If not, how do you know about JEE. In case you want to tell that it's a very prestigious exam and is famous throughout the world then do tell me because I just qualified in the exam one month ago ;-) And yes, applying energy conservation is not that simple...
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    Will it revolve?

    case (3) doesn't seem to be that correct. Recently i wrote a computer simulation for gravitation force. It just used the the gravitation force law to predict the motion of a planet if the initial distance and velocity were given. And I found several different kinds of motion. In most of the...
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    Who all can have a signature?

    I am not trying to compare physicsforums with anything. I just want to say that I have been posting on this forum for quite some time now and several times I have felt that it would be nice if i could have one signature. But if not giving signatures helps physicsforums that immensely then it's...
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    Who all can have a signature?

    Hey, but what about making just the 'signature' public? Anyway I am a college student and I don't think I will become a PF contributor just to get a signature of my own! Signatures are nice and websites do provide them for free.
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    Gas Problem Dealing with Explosives

    Even I don't see much point in it. I wrote this under the assumption that hankw is somehow able to find the rate of increase in the volume. Also, I think, that the information that is available is very less to infer anything from it. We must assume several things, the variety of the explosive...
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    Will it revolve?

    Yes, I do notice some flaws. First of all, using conservation of energy, we can only find the magnitude of the velocity; we can't say anything about its radial component. Then, I don't understand what you mean by the radial component being enough to balance the centripetal force. If you mean...
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    Who all can have a signature?

    'Currently'? You mean, it may be allowed to all in the near future? Then why delay?
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    Gas Problem Dealing with Explosives

    Thanks for the explaination. Obviously, for what you want to calculate, you will need to assume that a particular explosive was used. We assume that it's TNT. It seems, from your video, you can find out the rate of formation of the gas clouds, i.e., volume of gas liberated per second. Then...
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    Will it revolve?

    The flaw in the Rutherford's model arises because the revolving particle is CHARGED and accelerated charged particles lose energy. Here, the planet is not charged and so what you are saying won't happen. But I think what Janus says is correct because of the following reason :- The angular...
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    Who all can have a signature?

    Yeah, basically, who all can have a signature? Only paid members? What I know is that I can't because there is no 'Your Signature' type option in the 'Edit Profile' section.
  18. V

    Gas Problem Dealing with Explosives

    What do you mean by the 'air volume of the overpressure'?
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    Sound Waves in Outer Space

    Sounds interesting. So if they did reach in phase, we would here a large explosion! Anyways, I have one more point for consideration. Everyone has noticed that if you swing a stick in air, you get a whooshing sound. This sound definitely comes from the disturbance caused by the stick in...
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    Surprising physics

    Here is another one I came across that has a little 'I didn't expect that' effect. It doesn't give you a shock in the beginning, but once you think about it, it seems impossible. Basically, you have a vertical square iron plate of large dimensions and a comparatively small magnetic rod. You now...
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    Will it revolve?

    Consider it any kind of a problem. Just tell me is there any simple way to predict that it will collide or not or do we have to find the exact motion profile and see whether it passes through the star?
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    Can anyone recommend a good gyroscope

    Yes. Of course.
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    Will it revolve?

    OK, assume that they are point objects. That was the actual problem. I missed to mention it.
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    Will it revolve?

    There is a lonely massive star standing almost fixed at some point in this universe. There is a small planet projected with some velocity in some direction near the star. Given the masses of the star and the planet and the velocity, can you find whether the planet will collide with the star? If...
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    Paradox contradicts

    Ooooops! One more Ooooooops! to make the msg longer than 10 characters such that it is accepted.
  26. V

    Find the normal force by each support

    Thanks for the reply all of you. I agree with the points you all have given. Thanks for suggesting these books. May be things will be clearer once I go through them. It's true that the rational senses need fine tuning. And I am looking forward for that 'fine tuning'. What is not comprehensible...
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    Paradox contradicts

    Yeah, thanks for the link. It clears things up.
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    Paradox contradicts

    I will write a few questions in succession such that the result of one contradicts that of the other and this renders the full situation fairly complicated. What I want you to do is to make the situation more comprehensible. A & B are two close friends. They go to an ATM centre and withdraw...
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    Find the normal force by each support

    Hey hey! Two things give me a hint that somehow my problem is being considered a very simple problem - 1. that it has been moved from the 'Classical Physics' section to the Home Work section and 2. the reply by HallsofIvy. First of all, when I found HallsofIvy claiming the existence of a...
  30. V

    Find the normal force by each support

    Basically, you have a rod kept horizontally on three supports. It's in equilibrium. The positions of the supports and the mass and length of the rod are given. Find the normal force by each support. The problem looks particularly simple. But notice that you have a shortage of an equation. You...
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