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Physics : Recent Questions and Answers (Page 296)

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

What is the moment of inertia of a free electron?

Well, elementary particles have no moment of inertia $I$. But what is the nearest possible answer to the question for a free, spinning electron? In general, one has a...

Asked on 05/31/2021

0 answer

How to use the first law of thermodynamics for simple mechanical systems?

I'm confused about what exactly is $Q$ and $U$ and their signs. Consider a block initially having some kinetic energy which we stop and we want to find by how...

Asked on 05/31/2021 by A Googler

3 answer

What if inertial and gravitational mass were different?

It's well known and heavily documented that gravitational and inertial mass are identical.This has been experimentally tested to many digits of precision. But nothing I've seen ever describes how...

Asked on 05/31/2021

1 answer

Energy Spectrum and Gauge Transformations

There is a question in SE about the fact that the Hamiltonian isn't invariant under the EM gauge transformations. I wanted to ask about its consequences here. I know...

Asked on 05/31/2021 by seyed

3 answer

What is the relationship between state variables and conservative force fields?

State variables are defined as being independent of path, just like conservative force fields. Is there any relationship between state variables and conservative force fields? Is it because there is...

Asked on 05/31/2021

1 answer

Is the Hessian matrix of thermodynamic potentials regarding extensive variables positive definite?

We learned that the Hessian matrix of thermodynamic potentials regarding extensive variables is positive definite (as a stability condition). If we take the grand potential in its natural variables,...

Asked on 05/31/2021

0 answer

Why is nuclear force spin dependent?

Why nucleons with parallel spins have greater nuclear force than the ones with anti-parallel spins?I just want a clear and easy explanation. Thank you!...

Asked on 05/31/2021

3 answer

Can the $Q$ factor of a system exceed unity ($Q>1$) while the maximum gain is 1?

when calculating the quality factor of an acoustic system using FWHM definition I get 39. the maximum gain is approximately (see the attached figure ...

Asked on 05/31/2021 by meryus

0 answer

Orthogonality of two randomly chosen velocity vectors in the kinetic theory of gas and the relative velocity

I was looking for the average value of the relative velocity of ideal gas molecules in the kinetic theory. The following is from this article. ...

Asked on 05/31/2021

2 answer

Would the temperature of a gas change when accelerated in a train?

I was thinking about a situation where some gas is enclosed inside a container and kept in a train at rest. The train accelerates, gains a maximum speed and then...

Asked on 05/31/2021 by Rajath Radhakrishnan

5 answer

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