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Physics : Recent Questions and Answers (Page 335)

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

Do permanent magnets have an electric current surrounding them?

Permanent magnets seems to have different properties to electromagnets, such that electromagnets can be used for induction and energy transfer if a conductor is placed within their changing magnetic field....

Asked on 05/15/2021 by Cal Aldrin

3 answer

How does one calculate the chance that an asteroid hits the Earth and what does this chance mean?

I read in this article (in "Independent"):An asteroid that is projected to come close to Earth later this year has a 0.41 percent chance of hitting the...

Asked on 05/15/2021

2 answer

Maxwell solution in differential forms

Maxwell equation's in differential form: $dE = 0 and (ast d ast)E = p$ in static situation. Where $E in Omega^1(U)$, $p in Omega^0(U)$,...

Asked on 05/15/2021 by User1825

0 answer

Two spring-coupled mass system

I am confused with writing the equation of motion of masses and finding normal modes. The problems I've dealing with before, masses is always moved in same directions, and I...

Asked on 05/15/2021 by arfentopul

3 answer

$φ^3$ theory: three-point, one-loop diagram ($D=4$)

I am attempting to calculate the one-loop diagram for the $φ^3$ three-point function, which is equal to (dropping a factor of $-i$): $$g^3 int_E frac{1}{(2 pi )^4}...

Asked on 05/15/2021 by turbodiesel4598

1 answer

Lindblad and Input-Output Formalism in Quantum Optics

I'm confused about how to apply the Lindblad formalism and the input-output formalism in practice, and how one goes between the two. Suppose I have a cavity (C) coupled...

Asked on 05/15/2021

2 answer

How do i read a pendulum phase diagram?

I'm trying to understand how the intermediate axis theorem works. And in one of the works that I found, they used a pendulum phase diagram, but idk how to read...

Asked on 05/15/2021

1 answer

Is This Hypothesis Correct?

I have constructed a thought experiment regarding whether the future is deterministic or not. It goes like this: Let’s take an Observer 100 light years away from earth. Now presently,...

Asked on 05/15/2021

1 answer

Computational detail in derivation of Green-Kubo relation for diffusion coefficient

I read Kubos paper on the Fluctuation Dissipation Theorem https://www.mrc-lmb.cam.ac.uk/genomes/madanm/balaji/kubo.pdf and right at the beginning there is a calculation which seems a bit miraculous to me$$D=lim_{ttoinfty}frac{1}{2t}langle{x(t)-x(0)}^2rangletag{2.4}$$...

Asked on 05/15/2021 by Thomas Suchanek

0 answer

What is a good formula to estimate the solar load on an electronics enclosure?

I realize simulation is probably the way to go on this but I wanted to get an understanding of it. I'm going to put some electronics in a plastic box...

Asked on 05/15/2021

0 answer

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