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Physics : Recent Questions and Answers (Page 637)

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

Conceptual Question about Suspension Bridge Forces

Two walkways are suspended from vertical rods. In the first scenario, one long rod supports both walkways and is attached to the ceiling....

Asked on 01/20/2021 by drone

4 answer

Physical significance of the discrete Heisenberg group

In quantum mechanics, Schrodinger's position and momentum operators are characterized by the fact that they form a representation of the Heisenberg group $H_{2d+1}$ over $mathbb{R}^{2d+1}$. Discretizing this group,...

Asked on 01/20/2021 by Thomas Vidick

0 answer

Spin of Nucleus

N has 7 protons and 7 neutrons per atom. So the spin is S=1 for one N-atom. Why is this? I know that they do pairs in the shell model....

Asked on 01/20/2021 by Lisa B.

1 answer

Why do we not try to describe $4$d quantum gravity with a $3$d CFT?

In AdS/CFT correspondence, one mostly studies the case with AdS$_5 times$ S$_5$ on the string side and $4$d $mathcal{N}=4$ Super Yang-Mills on the gauge field theory...

Asked on 01/20/2021

1 answer

How to calculate the amplitude increase by resonance?

If you know the natural frequency of an object, how would one calculate how much the amplitude increases because of resonance? I would imagine it would depend on the material?...

Asked on 01/20/2021

1 answer

Why does stopping potential remain same on increasing power of Light Source

My question is that Power, which is energy per unit time P=Nhν/t as the formula suggests, can be increased in two ways, increasing no. of incident photons or increasing frequency....

Asked on 01/20/2021

1 answer

Why can we see light further than it shines?

This is a question I’ve been thinking about for a while. If I’m standing in the middle of a straight road, during night, I can see a car coming towards...

Asked on 01/20/2021 by Tchapo

9 answer

Question in Derivation of Lie algebra

In Weinberg's QFT Volume 1 Chapter2, he "derives" the Lie algebra from the Lie group as follows[...] a connected Lie group [...is a...] group of transformations ?($theta$) that are...

Asked on 01/20/2021

0 answer

Compensation formula for temperature changes on a load cell

I'm looking for a formula to apply a compensation to the voltage output of a load cell that produces an error with changes in temperature. See the curve below of...

Asked on 01/20/2021 by deandob

0 answer

Relationship between time for fluid to pass through hole in cup vs kinematic viscosity

If you measure the time taken for a fluid (such as oil) in a plastic cup to fall through through a hole made in the bottom of the cup, could...

Asked on 01/20/2021 by Martin Cheong

0 answer

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