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Physics : Recent Questions and Answers (Page 68)

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

How to find velocity of water flow and $Q$ if I know static pressure at the end of the pipe of known diameter?

I have a pipe. At its end I have mounted pressure meter. Of course there is no circulation. Water pressure meter is a kind of stopper for water.I know...

Asked on 09/05/2021

1 answer

Colour temperature and emission spectroscopy

If blue light is emitted from excitations below 500C for example potassium in a flame emits purple photons but only has to be 500C for it to do so, then...

Asked on 09/05/2021 by 110010110

1 answer

Why do some Lagrangians have both a rotational and a non-rotational part of their kinetic energy?

I was going through a derivation and I came across a term in the kinetic energy of the Lagrangian that had both a velocity term and a rotational term. So...

Asked on 09/05/2021

2 answer

Electromagnetic wave equation with time varying phase velocity

I am attempting to solve Maxwell's equations for the electric field of an electromagnetic wave, with time varying phase velocity, propagating within a medium within unity permeability but time varying...

Asked on 09/05/2021

1 answer

Question on Feynman's Proof of Energy Conservation

Since this is two-dimensional motion, why would $m(dv/dt)$ not have some directionality in addition to being the rate of...

Asked on 09/05/2021 by FieldOfDreams

1 answer

Faraday's Law and Electromagnetic Induction

Faraday's Law of electromagnetic induction states that the rate of change of magnetic flux linkage is proportional to the $mathcal{emf}$ induced. For a conductor, the formula goes ...

Asked on 09/05/2021 by Avid Reader

3 answer

Displacement of electron in magnetic and electric field, verification of one logic

I have solved this problem, but just need verification of my thinking about this as well as the question book has used full page for solution(using simple harmonic) but I...

Asked on 09/05/2021

1 answer

How does circular motion begin in this case?

In the figure, Suppose the rod system(shown black) starts moving with some angular velocity say $omega$ with the bob...

Asked on 09/05/2021 by Muzammil ahmed

1 answer

Mobile inclined plane

If i have a block falling down a mobile inclined plane, would it work if I solve the problem as usual in the plane's frame of reference and use the...

Asked on 09/05/2021

1 answer

Which equations of 5 string theories show that elementary particles formed by strings?

It is commonly said that"elementary particles are indeed formed by strings."(from E Witten interview) Which equations of string theory show that elementary particles are indeed formed by...

Asked on 09/05/2021

1 answer

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