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Physics : Recent Questions and Answers (Page 519)

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

What does current look like if it is pulsed through a wire?

If you had a loop of wire attached to a power supply capable of generating very fast pulses, how does the current travel around the loop? For explanation sake, it...

Asked on 03/03/2021 by user1710344

0 answer

Computer code to quickly check equation of motion to first or higher order from action (4D spacetime)

I derived equations of motion up to first order from a Lagrangian for a scalar field in a 4D spacetime. Now, I would like to cross-check my results. Is there...

Asked on 03/03/2021

0 answer

Pressure above = below?

Basic question:Lets assume we have an object (cuboid) in the air, with area A, width w at height h. Is the pressure from above always equal to pressure from...

Asked on 03/03/2021

2 answer

Microscopic origin of non-linear optical effect

I know that a non linear optical medium is a medium in which the optical response for example polarisation vector varies asbegin{equation} vec{P}=epsilon_0chi^{(1)}vec{E}+epsilon_0chi^{(2)}vec{E}^2+.......end{equation} But...

Asked on 03/03/2021

3 answer

Confusion regarding the construction of in u-modes for a spacetime that has a horizon created in the finite past

I have been studying the following paper linked https://inspirehep.net/files/4d58177a3c19484ba097b48c9f4e9a7f where they are exploring Hawking Radiation in Dispersive Media. While constructing the theory and tools for the dispersionless...

Asked on 03/03/2021 by Achintya Mitra

0 answer

Could evaporation of a liquid into a gas be thought of as dissolving the liquid in a gas?

As I understand it, evaporation is thought of as a phase transition from a liquid into a gas. Individual molecules get enough energy to break surface tension, and flung up...

Asked on 03/02/2021 by Steve Sether

4 answer

Submarine buoyancy

Maybe a silly question but.. A submarine has ballast tanks to control it's buoyancy. To submerge, water is allowed to fill the ballast tanks which displaces the air inside. When...

Asked on 03/02/2021 by Barryd

2 answer

Representing bound geodesics in Penrose diagrams

I recently started reading about conformal (Penrose) diagrams and have since been faced with a couple of conceptual doubts. Based on the coordinate transformations, null curves in Penrose diagrams are...

Asked on 03/02/2021

1 answer

Magnetic field lines and magnetic flux

In my text book magnetic flux density is defined as the number of field line per units of area. what I know is the field line is just a conceptual...

Asked on 03/02/2021

1 answer

When to take the other body as point mass or apply parallel axis theorem on it?

What is the range of $r$ in the formula for the parallel axes theorem? Eg. if two discs are attached at a certain point on their circumference and both...

Asked on 03/02/2021 by ersamvs73

2 answer

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