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Physics : Recent Questions and Answers (Page 332)

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

Matrix element of powers of position operator for quantum harmonic oscillator

A similar question has been asked here before, but that did not contain the particular solution I am after and is now closed. I was wondering if there is...

Asked on 05/16/2021 by Quantum

4 answer

How well does centrifugal force project liquid?

Apparently, high-pressure impact sprinklers, used to water fields, have pumps that work at between 25 and 60 psi. This lead me to wonder: If I swing a stick with a...

Asked on 05/16/2021 by fodder feline

0 answer

Skin effect and currents

Here in this picture you can see $I_W$ which is induced by H.But why $I_W$ is not vice versa?Because of$$rot...

Asked on 05/16/2021 by kame

0 answer

Can the freezing point of Nitrogen be reduced?

There was an interesting Q/A about mixing helium and nitrogen. Is there anything that can be added to liquid nitrogen to reduce it's freezing point to below 63 kelvin?...

Asked on 05/16/2021 by Paul De Jong

1 answer

Divergence of electric field of point dipole

Am I correct to say that since the divergence of the following E field $$ mathbf{E} = frac{1}{4piepsilon_0}left[ frac{3(mathbf{p_0}cdothat{r})hat{r}-mathbf{p_0}}{r^3} right] - frac{1}{3epsilon_0}mathbf{p_0} delta^3(mathbf{r}) $$ satisfies Gauss’ law for electricity...

Asked on 05/16/2021

1 answer

How do I calculate the distance a ship will take to stop?

I am a River Pilot and drive ships for a living. These ships are very large and range up to 160,000 Metric Tons. I am trying to figure out how...

Asked on 05/16/2021 by wayofthefuture

5 answer

Critical Field in a Superconducting Solenoid

Suppose you have a superconducting wire with a constant current below the critical current and a resulting magnetic field below the critical magnetic field. If you were to wind the...

Asked on 05/16/2021 by dl19

1 answer

Magnetic Moment MIT Bag Model

I'm reading the book "Advances in Nuclear Physics vol 13" by J. W. Negele and Erich Vogt In chapter 3, one wants to calculate the magnetic moment for a current...

Asked on 05/16/2021 by cmmigl

1 answer

How did magnets first come about?

Physics concepts state that in order to turn ferrous (or other magnetic) material magnetic, you need to stroke it with a magnet. Okay, but for the first magnet, we didn't...

Asked on 05/16/2021

3 answer

What is a Witten diagram?

Recently I heard the terminology of Witten diagram. Studying QFT, I frequently see Feynman diagrams and use them to compute scattering amplitudes, one-loop corrections and so on. In...

Asked on 05/16/2021

1 answer

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