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Physics : Recent Questions and Answers (Page 783)

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

Is a persistent current in a room-temperature superconductor a perpetuum mobile?

Persistent currents can be induced in superconductors that have no decay in current over the period of observation withing the measurement errors. (see for example this book...

Asked on 11/29/2020 by Iconstrife

0 answer

Why are these SUVAT equations true?

begin{align}v&=u+ats&=ut+frac{1}{2}at^2v^2&=u^2+2ass&=frac{(v+u)t}{2}end{align}I have just started with learning acceleration in school and I don't really understand why these equations are the way they are. I...

Asked on 11/29/2020 by randomlad

2 answer

Quantization and Commutation Relations

Why do we use commutation relations when quantizing any system? In the case of developing quantum mechanics from classical mechanics, we write the hamiltonian and then quantize it by having...

Asked on 11/29/2020 by NiRVANA

1 answer

What is the formula for the gain factor of a ferromagnetic core for a torquer coil rod?

I am an undergraduate who is currently designing an actuation system for a CubeSat, more specifically a PCB magnetorquer. (with 2 ferromagnetic core coils and one air core) I...

Asked on 11/29/2020 by Vlad Ilincăi

0 answer

Are Newton's first and third laws contradictory?

Newton's first law states that given an ideal situation, any force applied on a body would change its state of motion and the object would continue to pursue that state,...

Asked on 11/29/2020 by pyridine

2 answer

What are matter waves made of and what is their speed?

We know electromagnetic waves are made of oscillating electric and magnetic fields that can travel at the speed of light without a need for a medium. But, how about...

Asked on 11/29/2020 by mad112

2 answer

Yang-Mills massive ghosts

Is there any procedure to add a mass to Faddeev-Popov Lagrangian density of a pure Yang-Mills theory, other than just add it from nowhere?...

Asked on 11/29/2020

0 answer

Measuring the one-way speed of light?

I know many people (including me) are bombarding this site with questions about the recent Veritasium video about the one-way speed of light, but I think I found a...

Asked on 11/29/2020 by user276997

2 answer

Quantum information = quantum gravity?

I have recently listened to a podcast by Sean Carroll and Leonard Susskind (strongly recommended https://www.preposterousuniverse.com/podcast/2019/05/06/episode-45-leonard-susskind-on-quantum-information-quantum-gravity-and-holography/)on quantum gravity and how quantum information comes into play. Now...

Asked on 11/29/2020 by redhood

1 answer

Superfluids in areogel and porous media: why?

Aerogels are materials that are like ~90% or more air. As I understand, the topology of the material (i.e. of that part of the aerogel that is...

Asked on 11/29/2020

1 answer

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