# Search results for query: *

1. ### The pole and the rope

If the pole is that thin then there will be no spiraling, the puck will execute a circular motion, since there will be no torque. I don't know why he(the author, 'David Morin', I really like his writing style) mentioned 'thin'. I was just looking for a hole in my argument because I don't know...
2. ### The pole and the rope

yes and that is why I am taking both the radial and tangential components separately
3. ### The pole and the rope

No, the tension won't cause any change in 'radial' momentum because there is no change in tension as the rope wraps up, because nothing is pulling it except for the pole and no external agent is doing work on the pole. Initially when the puck is driven, all the radial forces are balanced, and it...
4. ### The pole and the rope

A puck of mass 'm' on friction-less ice is attached by a horizontal string of length 'l' to a very thin vertical pole of radius R. The puck is given a kick and circles around the pole with initial speed V. The string wraps around the pole, and the puck gets drawn in and eventually hits the pole...
5. ### E & M, Infinite sheet of charge

I think you're right.I thought of the same thing at the beginning. But I think the author has done a technical mistake because of which I was having the trouble. Purcell says 'the change 'at' the surface' must be 4(pi)s, if he said 'across' the surface, I would have been convinced by the same...
6. ### E & M, Infinite sheet of charge

Oh... I wanted to write C.G.S, but wrote M.K.S instead, thanks for pointing that out. The problem with the superposition thing is that the scenario doesn't consider a particular arrangement of external charges, but rather generalises the proposition to all the possible arrangements; logically...
7. ### E & M, Infinite sheet of charge

The problem I have is about a simple remark made in the book 'Berkeley Physics Course Volume 2, Electricity and Magnetism', chap. 3 figure 3.4 b. It says that if we have an infinite sheet of charge but with 'other charges' present elsewhere in the system, the only thing we can predict is that...
8. ### Spring+Pendulum combined system

Yes! That should be it, the question did say about the 'high amplitude' of the resultant oscillations, so there's a high possibility that the composite system is showing resonance, i.e the driven system may undergo oscillations at the same frequency as that of the driving system. Thanks for the...
9. ### Spring+Pendulum combined system

I've tried. But there's so much approximation I needed to use to derive the final relation, (using energy consideration), I'm no longer satisfied with or sure about my answer. So better I thought if it be run by experts. I found both systems to be oscillating with the same freq. and K=w/l. Yes...
10. ### Spring+Pendulum combined system

A weight W is suspended from a rigid support by a hard spring with stiffness constant 'K'. The spring is allowed to have only vertical motion. A simple pendulum of length 'l' with a bob of mass 'm' (mg<<W) is suspended from the weight W and is set oscillating in a horizontal direction. After...
11. ### Angular velocity and external forces

my intuition tells me that it must change since KE must be conserved, and for it to be so, the angular velocity must change as the moment of inertia changes with the reduction in mass, but I ain't sure, so pls reply...
12. ### Angular velocity and external forces

Suppose I have a ring of mass 'M' rotating about an axis passing through its center with constant angular velocity 'w', now if its mass changes by dm due to some unknown reason during rotation, will the angular velocity change, assuming no external force acts on it during any point of time?
13. ### Proving the Normal Law of Errors: A Guide

Thank u DaveC426913... It was a big help! I thought posting here was just a way of gaining knowledge, but now I know it's just learning how to post, thanks for that...
14. ### Proving the Normal Law of Errors: A Guide

How to prove the normal law of errors?
15. ### Rectilinear vs Curvilinear Motion: Explained

Thanks 'Mikelizzi', for your reply which changed my interpretation of the statement... My prev's interp'n was that the body 'C' is accelerating in the same dir'n as is the motion of body 'B' w.r.t A... So for my 1st interpretation, would the movement of C would still look Curvilinear to B, or...
16. ### Rectilinear vs Curvilinear Motion: Explained

If an object O is performing rectilinear motion w.r.t a Galilian body of reference K then w.r.t an accelerated body of reference K', O performs 'curvilinear' motion... What I ask for is a detailed explanation of this statement.
17. ### Big Bang Theory: Can It Really Explain the Universe?

U should read some of Stephen Hawking's books, no one has a clearer picture about this matter than him... Now to your question there are no definite answers and to know the definite answer is beyond our limitations...the idea of big bang came from the observation that all the galaxies are moving...
18. ### Rotation- is axle or wheel rotating?

That 'fake gravity' itself is ur answer...if u r standing on the inner side of the outer wheel watching the axle, the fact that u r able to stand just like a person on Earth suggests that the outer wheel is rotating w.r.t an inertial frame of reference producing centrifugal force...weigh an...

20. ### Exploring the Puzzling Paradox of Special Relativity

A/to special relativity if one is moving faster, he sees that the clocks w.r.t which he is having relative motion are ticking faster.It increases my curiosity to know what would an observer w.r.t whom the person is having relative motion see, if he observes the watch of the traveller.Will he...
21. ### A question on wave nature of EM radiation

There is a EM radiation of frequency suppose x Hz.Let it has to travel a distance of y m.Now what's the time required for the radiation to travel the distance?The question seems to be very easy, but my confusion is in how can the frequency,distance,speed and time can be related? Can someone give...
22. ### Solid angle diagram

What is a plane angle and a solid angle?(please provide diagram if possible) Also, what is the definition of 1 sr and 1 rad?
23. ### Wave-particle duality

Photons are always called 'particles'. But through many experiments (by scientists such as Geoffrey Taylor), it has been found that photons show some strange characteristics which resemble those of waves. In fact scientists also reveal that electrons also show wave-like nature(in fact they have...