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Physics : Recent Questions and Answers (Page 130)

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

Action of classical mechanics is bounded from below by the Planck constant

I was wondering about the dimensions of the Planck constant ($h$) and the dimensions of the action, which are obviously same. Then a train of thought led me to...

Asked on 08/07/2021

1 answer

Why is life impossible in the supersymmetric Minkowski vacuum?

I read in several sources that the existence of life is impossible in the supersymmetric Minkowski vacuum (also called the terminal vacuum, the true vacuum or the global minimum). Why?...

Asked on 08/07/2021

0 answer

Eigenvalues for systems in the canonical ensemble

Consider an ensemble of ? identical systems part of the canonical ensemble each with same volume and composition at thermal equilibrium. Let $ψ_j (vec{r_j}, t)$ denote the (normalized)...

Asked on 08/07/2021 by Michaelangelo Meucci

0 answer

Motional emf through a non-uniform field

Suppose we have a rod of length L (in the upwards direction - y) moving to the right with velocity v. The magnetic field is into the plane of the...

Asked on 08/07/2021

0 answer

Newton-Euler approach for the equations of motion of spherical pendulum attachted to a moving body with 6 degrees of freedom

I would like to obtain equations of motion for a spherical pendulum suspended from a (6 degrees of freedom) moving body (generalization of a simple pendulum on a cart) using...

Asked on 08/07/2021 by sample

1 answer

How does the Fermi level of different materials reach equilibrium when in contact?

I'm a college student studying semiconductors. I can't understand what is happening inside the materials when two or more different materials are in contact. Can I get some help? So,...

Asked on 08/07/2021 by Junyong Lee

1 answer

Should coercivity for making electromagnets be high?

I have been studying the Hysteresis loop for ferromagnetic materials in my textbook. Now I know that coercivity represents the amount of current to apply in opposite direction of retained...

Asked on 08/07/2021 by user265735

2 answer

Pulley inertia moment of inertia

Considering a pulley with some mass, or some friction, how can its inertia (or moment of inertia) influence the tension on 1 rope? Which part of the rope is influenced?...

Asked on 08/07/2021 by Vitor Aguiar

2 answer

Why does a bow shock produce less heating?

A bow shock is a bow-shaped normal shock created around a blunt object flying supersonic. The shock itself - mach =...

Asked on 08/07/2021

2 answer

Doubt in the definition of the stress-energy tensor in Peskin and Schroeder's QFT book

We can describe the infinitesimal translation$$x^{mu} to x^{mu}-a^{mu}$$alternatively as a transformation of the field configuration$$phi(x) to phi(x+a) = phi(x) + a^{mu} phi(x)....

Asked on 08/07/2021 by Edison Santos

0 answer

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