Physics Questions, Problems & Solutions : TransWikia.com ~ Page 163

Nuclear reactor in a cruise missile. How?

So it is declared, that there are cruise missiles with nuclear reactors on board. As I understand, when it's working, the neutrons keep flying from off the fuel. Neutrons give...

Asked on 07/24/2021 by Elias Goss

3 answer

Angular momentum about centre of mass is not always equal to $I_text{com}omega$, Right?

Angular momentum about a point on the rotational axis is equal to sum of angular momentum perpendicular to rotational axis and angular momentum parallel to rotational axis. The perpendicular component...

Asked on 07/24/2021 by Vishal M Das

1 answer

Shankar on Hamiltonian Separability, Entanglement

In Shankar's Principles of Quantum Mechanics, I recently came across the attached section. I am not sure I agree with equation 10.3.38 in particular. What is clear is that, if...

Asked on 07/24/2021

1 answer

Renormalization group: different versions

There are different methods, which have the same name Renormalization Group.Wilson Renormalization GroupParticle physics Renormalization GroupFunctional renormalization groupThe Bogoliubov Renormalization Group...??Why there are different...

Asked on 07/24/2021

0 answer

Why a factor of 1/2 in cosmological Boltzmann equation for the phase space density?

In "The Early Universe" book by Kolb and Turner the Boltzmann equation is written for FRWL metric. The equation states: begin{align}Efrac{partial f}{partial t}- frac{dot{R}}{R}|vec{p}|^2frac{partial f}{partial E}=mathbf{C}[f]end{align}Now...

Asked on 07/24/2021

0 answer

Which waves could be narrow and directional; any other than electromagnetic?

Which waves could be narrow compared to medium where they propagate and be also directional? Except for electromagnetic. My guess is that we know no such waves/mediums, electromagnetic propagate...

Asked on 07/24/2021

0 answer

Is the universe finite or infinite?

I thought the universe was finite, but then I read this: How can something finite become infinite? And they seem to assume it is infinite. So which is it?...

Asked on 07/24/2021 by HappyDeveloper

7 answer

What physical meaning “determinant” of a divergency (divergent integral or series) can have? Is there a parallel with functional determinant?

I am working on the algebra of "divergencies", that is, infinite integrals, series and germs.So, I decided to construct something similar to determinant of a matrix of these...

Asked on 07/24/2021

0 answer

Change of Mutual Information in Isolated Quantum Systems

I was reading some publications regarding correlation and mutual information for composite quantum systems.I noticed that most papers give the expression for the mutual information to be:$$Delta...

Asked on 07/24/2021

1 answer

Energy of the magnetic field

I have a doubt regarding a particular problem.Let's suppose to have a hollow vertical cylinder whit a vertical current flowing on the surface. Let's now suppose to compress the...

Asked on 07/24/2021 by ZFC

0 answer

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