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Physics : Recent Questions and Answers (Page 287)

Find answers to your questions about Physics or help others by answering their Physics questions.

Fourier transform of the Coulomb potential

When trying to find the Fourier transform of the Coulomb potential $$V(mathbf{r})=-frac{e^2}{r}$$ one is faced with the problem that the resulting integral is divergent. Usually, it is then argued to...

Asked on 06/04/2021

7 answer

Neglecting friction on a pulley?

So, this is how the problem looks: Plus, the pulley is suspended on a cord at its center and hanging from the ceiling. You're...

Asked on 06/04/2021 by user20250

1 answer

What would be the intensity of light reflected on the interface of denser to rarer medium when the critical angle is not achieved?

There is always some amount of light reflected on the interface of the surface of denser to rarer medium. I just want to know, how much of light is actually...

Asked on 06/04/2021 by Om G

0 answer

Does gravity have anything to do with Van Der Waals forces?

Does gravity have anything to do with Van Der Waals forces? Just throwing this out there, I was wondering if they do because gravity is such a...

Asked on 06/04/2021 by Sam Cottle

3 answer

What causes tangential velocity of a planet to change in an elliptical orbit?

I am confused about this concept of central force motion. We have read that object undergoing a change in velocity must possess acceleration. However, in elliptical orbit motion gravitational force...

Asked on 06/04/2021 by Mirae

4 answer

Reynolds number determines turbulent or laminar but Moody Chart has different interpretation

One can calculate the Reynolds number to determine whether or not flow is turbulent or not inside a pipe with circulating water. The formula is: $Re = frac{rho VD}{mu}$...

Asked on 06/04/2021 by Physther

2 answer

How to determine maximum speed for a given bicycle gear ratio?

This question came up watching a final sprint at the Vuelta San Juan this year. One of the riders was sitting down in the sprint because he had "spun out"...

Asked on 06/03/2021 by Ryan C

1 answer

I am confused about the idea that the speed of light is independent of the speed of the source of light

Imagine that a mast of a sailboat is $186,000$ miles long, and the sailboat is moving to the right at a constant $10$ miles per second. If you...

Asked on 06/03/2021

4 answer

Charge of conductive sphere around charge

Consider suspending a charge inside a conductive sphere: The answers to this question state that there will be a charge...

Asked on 06/03/2021

1 answer

Are there limits for the speed of sound? A maximum or a minimum only?

The speed of sound in materials of various states of matter differs a lot. But does it have fundamental limits?Is there a maximal possible speed of sound? Is...

Asked on 06/03/2021

5 answer

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