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Physics : Recent Questions and Answers (Page 302)

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

Possible to use alcali solution to discharge static electricity?

My question may contain wrong assumptions:I believe static electricity present in a workshop because of friction may be caused by electrons or negative ionsI believe that it is somehow possible...

Asked on 05/28/2021 by adrienlucca.wordpress.com

1 answer

Calculation of elastic constants - when do we need to account for Poisson?

I try to calculate the elastic constant tensor for some organic molecular crystals.There are plenty of accounts in the literature where people do that, using atomicresolution models and...

Asked on 05/28/2021 by Michael Brunsteiner

2 answer

Why do object rotate at all?

So I realize I am asking a pretty obvious, intuitive question. All of us have witnessed object rotating in everyday life when we nudge/push them from the side (not from...

Asked on 05/28/2021

8 answer

Second consequence of invariance under regular canonical transformation in Shankar's QM book

Near the end of chapter 2 of R. Shankar's book Principles of Quantum Mechanics, he talks about two consequences of invariance of the Hamiltonian under a regular canonical transformation. My...

Asked on 05/28/2021

1 answer

Why can't a compact 10 MeV electrostatic particle accelerator not be built?

I've been thinking about this problem for a while, since I want to see if a compact accelerator driven nuclear reactor can be built for powering aircraft and rockets. The...

Asked on 05/28/2021 by user11377

1 answer

How is it that Increase in amplitude of electromagnetic radiation results in increase in number of photons

I cannot comprehend how the increasing of amplitude of an electromagnetic wave increases the number of photons. How does this even happen. I am also not able able to make...

Asked on 05/28/2021

2 answer

Potential Energy of body and Earth system

I read in my textbook that the potential energy is a system property. In case of gravitational potential energy, the potential energy is a shared property of both the body...

Asked on 05/28/2021

3 answer

Wavefunction used in Derivation of Josephson Effect

In deriving the Josephson Effect, the ansatz wavefunction is given as $sqrt{n} exp{(idelta)}$ which leads to the Josephson Relations. It seems that this wavefunction is used because $<psi|psi>$...

Asked on 05/28/2021

1 answer

Does the density parameter alone determine the fate of the universe?

According to this: http://astronomy.swin.edu.au/cosmos/D/Density+Parameter The density parameter alone determines the fate of the universe (if its less than 1 expands forever, etc.). But according to wikipedia that's...

Asked on 05/28/2021 by pepitoz

1 answer

General Relativity and Computing with Tensors

In Riemannian Geometry (or Pseudo-Riemannian too), all of the operations performed are in general position dependent. For example, the metric tensor $g_{munu}(x)$ is dependent on position $x^i$ for $i=0,cdots,N$....

Asked on 05/28/2021

2 answer

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