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Physics : Recent Questions and Answers (Page 667)

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

Potential below a grounded conducting plane

If I have a charge $q$ above a grounded conducting plane, I know I can calculate the potential of the charge using image method. Since the plane is grounded,...

Asked on 01/08/2021 by Ssw1004

1 answer

Fluid Mechanics Infinite Plate Assumption

What should be the correct definition for a flow between infinite parallel plates? If I have a very long rectangular channel with height H and width W, can I approximate...

Asked on 01/08/2021 by johz

0 answer

Explaining accelerating spacetime expansion?

I should begin by noting that I am NOT a physicist, I study differential geometry and so my physics background is extremely limited. That being said I was reading a...

Asked on 01/08/2021 by Jonah Weinbaum

0 answer

How do photons carry information?

In cosmology it's frequently said that photons from the early universe carry information from that time. However, wouldn't they also carry data from later interactions? How do we ...

Asked on 01/08/2021 by Manish Kumar Singh

1 answer

Proof of the differential Bianchi identity

I was trying to prove the differential Bianchi identity by applying the covariant derivatives to each of the Riemann tensor terms $R^{lambda}_{sigmamunu;rho}+R^{lambda}_{sigmanurho;mu}+R^{lambda}_{sigmarhomu;nu}=0spacespacespacespacespacespace(1)$ and I got here: $R^{lambda}_{sigmamunu;rho}=R^{lambda}_{sigmamunu,rho}+Gamma^{lambda}_{mrho}R^{m}_{sigmamunu}-Gamma^{m}_{sigmarho}R^{lambda}_{mmunu}-Gamma^{m}_{murho}R^{lambda}_{sigma mnu}-Gamma^{m}_{nurho}R^{lambda}_{sigmamu...

Asked on 01/08/2021

2 answer

Why doesn't a compression pulse on a spring move backwards?

I've a spring and I give it a single impulse towards left. A compression zone is produced as is shown...

Asked on 01/08/2021

1 answer

Huygens' Principle alternative explanation on reflection

It seems that I have been stuck on this one paragraph about the derivation of the law of reflection using...

Asked on 01/08/2021 by Lyle

1 answer

When to use Conservation of Energy vs Conservation of Momentum

I am confused as to when each should be used to solve problems.I am not looking for the answer to this question, but I will include it here so you...

Asked on 01/08/2021 by Jo.P

2 answer

Published claimed falsifications of objective collapse theories

My main source of information about objective collapse theories is this review article by Bassi et al. There seem to be some problems with...

Asked on 01/08/2021

1 answer

Can liquids exert/be affected by normal force?

I am doing a problem in which I am drawing free-body diagrams for different objects in a system, and two of the objects which are included in my scenario are...

Asked on 01/08/2021 by Eva

1 answer

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