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Physics : Recent Questions and Answers (Page 77)

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

Dynamical mass of a galaxy

What does the dynamical mass of a galaxy represent? Is it the mass of the gas in the galaxy or the total mass of the galaxy? What can we infer...

Asked on 09/02/2021 by karthik gananath

2 answer

Quantum group symmetry in QFT

In Wikipedia article Coleman–Mandula theorem there's statement:Quantum group symmetry, present in some two-dimensional integrable quantum field theories like the sine-Gordon model, exploits a similar loophole.Are some examples...

Asked on 09/02/2021

0 answer

How does dielectric heating really work?

I'm currently working on a research project about dielectric heating of some materials and I'm trying to understand the physics of this phenomenon before going any further. I'm especially trying...

Asked on 09/02/2021 by Experience111

2 answer

If the ion trail behind a spacecraft were not neutralized by its electron gun, what would happen?

In the Space Exploration SE question Is there any possible reason to direct the electron gun specifically towards the ion trail behind an ion thruster? there is somewhat of...

Asked on 09/02/2021

1 answer

Why do colours of object change due to incident light?

A leaf is green, a pen is blue and so on because those objects absorb all colours and reflect only one colour. However when red light is incident on these...

Asked on 09/02/2021

4 answer

Intuition behind the center of mass

I know how the center of mass is defined, mathematically. It is the mass weighted average position of all the particles of a system. But calculating centers of mass and...

Asked on 09/02/2021

3 answer

Conditional average of a field in physics: $langle Psi rangle_{ij}^i = langle Psi rangle_i^i$

I was just reading this article on the quasicrystalline approximation (QCA). The article abstract says the following:The quasicrystalline approximation (QCA) was first introduced by Lax to break...

Asked on 09/01/2021

1 answer

How to calculate the attractive force in a gravitational field in General Relativity?

I believe that a gravitational field has energy, as Weinburg wrote in his textbook Gravitation and Cosmology, on page 171: "... ... the gravitational field does carry...

Asked on 09/01/2021

0 answer

Heat transfer in solidification of cylindrical billet

I am trying to plot IN MATLAB the temperature profile of solidification of metal in manufacture of cylindrical billets.The metal...

Asked on 09/01/2021 by patilak

1 answer

Conceptual question on heat transfer at steady state after a heated body is immersed in a fluid medium at low temperature

Recently during a discussion with a colleague we got into an argument. The discussion involved imagining a heated solid body at some temperature $T$ which is immersed in a...

Asked on 09/01/2021

1 answer

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