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Physics : Recent Questions and Answers (Page 267)

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

Has the ${cal N}=1$ Minimal SUSY standard model been ruled out by the nature?

Question: Has the ${cal N}=1$ Minimal SUSY standard model (MSSM) been ruled out by the nature? What are the natural constraints that ruled out such ${cal N}=1$...

Asked on 06/12/2021

0 answer

Could a Cadet heater release metallic dust into the air?

A Cadet style wall is periodically making a hissing sound. While it makes this sound, I notice my computer mouse is non-responsive. What is the most likely cause of the...

Asked on 06/11/2021 by M Katz

1 answer

On what things can two observers agree or disagree?

This question was inspired from the fact whether a moving body can become a blackhole in a frame of reference. On looking it up here, I found the answer was...

Asked on 06/11/2021

4 answer

Are superconductors primarily for DC transmission?

I understand Superconductors can be beneficial due to their resistance to magnetic fields as in levitating bullet trains or MRI machines, but is our main interest for DC power distribution?...

Asked on 06/11/2021 by Anthony Pape

1 answer

Scalar product of fields in Schwarzschild space-time

The scalar product of fields in curved space-time is defined by (Birrel, Davies) $$left(phi_{1}, phi_{2}right)equiv-mathrm{i} int_{Sigma} phi_{1}(x) overset{leftrightarrow} {partial_mu}phi_{2}^{*}(x)left[-g_{Sigma}(x)right]^{frac{1}{2}} mathrm{~d} Sigma^{mu}$$ where $mathrm{d} Sigma^{mu}=n^{mu} mathrm{d} Sigma$, with ...

Asked on 06/11/2021

1 answer

Does Coordinate time make sense in a universe with wormholes?

Let us say that you have a spacetime with wormholes, and a coordinate system. The two ends are created at almost the same point in spacetime. Then the one end...

Asked on 06/11/2021

1 answer

Cardboard and IR transmittance

Does infrared radiation transmit (not absorb & re-radiate) through cardboard in the IR-B or IR-C bands? I know IR-A does not transmit well but am curious about the longer wavelengths...

Asked on 06/11/2021 by N R

1 answer

Why $y'=y$ and $z'=z$ in Lorentz transformation?

According to Resnick’s Introduction to Special Relativity,Lorentz transformation in general can be given as:$x'=a_{11}x+a_{12}y + a_{13}z+a_{14}t$ $y'=a_{21}x+a_{22}y + a_{23}z+a_{24}t$ $z'=a_{31}x+a_{32}y + a_{33}z+a_{34}t$ $t'=a_{41}x+a_{42}y + a_{43}z+a_{44}t$...

Asked on 06/11/2021

2 answer

How is Coulomb’s constant affected when it is not in a vacuum permittivity?

How is Coulomb’s constant affected when it is not in a vacuum permittivity? And how do you determine the new value?...

Asked on 06/11/2021 by user278293

1 answer

Misunderstanding of Lenz's law

The increasing current (and hence increasing flux and changing magnetic field) in the outer solenoid induce a current in the inner...

Asked on 06/11/2021 by StopReadingThisUsername

2 answer

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