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Physics : Recent Questions and Answers (Page 620)

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

Are we seen or not by an observer from a galaxy farther away than the age of our solar system?

I looked at this question. There's one answer that alludes to what I'm asking, but I don't find it satisfactory, because to me the following is still a...

Asked on 01/26/2021 by AmateurMathPirate

3 answer

Can someone describe in detail (or in as much detail as possible) what neutrino physicists do?

I'm a first-year graduate student; due to a series of unfortunate events I will most likely begin research in the spring (meaning I'll officially join a group and be on...

Asked on 01/26/2021

0 answer

Why is it easier to handle a cup upside down on the finger tip?

If I try to handle a tumbler or cup on my fingertip (as shown in fig), it is quite hard to do so (and the cup falls most often). ...

Asked on 01/26/2021

7 answer

Transverse metric being 2-dimensional in null case

In Wald section 9.2 page 221 he says thatWe turn our attention; now , to null geodesic congruences. Again, weparameterize the geodesics by an affine parameter $lambda$, but...

Asked on 01/26/2021

0 answer

STU supergravity

Tghere are a lot of different papers about STU supergravity, for example see this. As I understand, STU supergravity is N = 2 supergravity coupledto three...

Asked on 01/26/2021

0 answer

Why Diode breakdown allows heavy current with a constant potential, but conductors fail to do so?

A conductor, metallic is considered to be containing a sea of mobile electrons. When a diode breakdown happen, we actually have a lot of electrons inside the depletion region that...

Asked on 01/26/2021

1 answer

Can a fluid approach the speed of light according to the equation of continuity?

We all are well aware with the equation of continuity (I guess) which is given by: $$A_1V_1= A_2V_2$$ Where $A_1$ and $A_2$ are any two cross sections...

Asked on 01/26/2021

5 answer

What is the physical explanation as to why the kinematic boundary condition must hold at the free surface of a wave?

The kinematic boundary condition at the surface of a water wave is given as: "a particle on the free surface remains there always". This is then written as the material...

Asked on 01/26/2021 by Anton Esmail-Yakas

1 answer

Cylindrical conductor and magnetic field intensity

A linear cylindrical conductor of infinite length is internally concave,i.e. the area of ​​between $0 leq r leq alpha$ is filled by a vacuum, while the area of...

Asked on 01/26/2021 by Eva Z.

0 answer

Einstein summation and square roots

It has occurred to me I don't know if there is a general rule about this or not. If I have an expression like: $$int sqrt{g_{ij}frac{dx^i}{dt}frac{dx^j}{dt}} dt$$ I take...

Asked on 01/25/2021 by StephenG

1 answer

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