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Physics : Recent Questions and Answers (Page 557)

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

Rate of Heat Loss of Plasma in Space

As space is effectively a vacuum that is roughly steady around 4 K, I'm trying to calculate the rate of heat loss for plasma traveling through space. The best...

Asked on 02/17/2021 by Zguy1217

1 answer

Elliptic orbits and why sun located at focal point acts like at the center of the ellipse?

In the book "Classical Mechanics Point particles and relativity by Greiner" We calculate Forces in the motion on an ellipse as follows we first parametrizate the ellipse $$vec r(t)=<acos(omega...

Asked on 02/17/2021 by Jale'de jaled

1 answer

Momentum operator on position eigenket

What is the result of:$$mathbf{langle x'|f(hat{P})|xrangle}$$I obtained this result:$$mathbf{langle x'|f(hat{P})|xrangle=tilde{f}(x'-x)}$$where $tilde{f}$ is the Fourier transform of $f$....

Asked on 02/17/2021 by Snpr_Physics

1 answer

Why do we say electromagnetic waves are self-propagating if they follow an inverse square law?

Electromagnetic waves are frequently described as "self-propagating", implying a mode of propagation distinct from that of electrostatic fields; but as I understand things, both have strength proportional to the inverse...

Asked on 02/17/2021 by Julian Kintobor

4 answer

De Broglie wave of a moving classical body

We have found that de Broglie wavelength for a classical object (say an moving automobile or a ball) has very very tiny wavelength due to its bigger mass(as compared to...

Asked on 02/17/2021 by Subhadip Pal

1 answer

Integration used in Derivations

I've seen many derivations in which Integration is used. But I don't understand the fact that why after going to a distance like $y$ or $x$, we take...

Asked on 02/17/2021

1 answer

What are these strange rays in the sky?

While driving, I noticed the sky had weird rays that appeared converge at some point on the horizon. I took a few pictures in hopes I could figure out...

Asked on 02/17/2021 by David Starkey

1 answer

Do we have energy-positive fusion reactors?

This is something I have been wondering about for a long time. I know modern fusion reactors are far from being commercially viable, and probably just as far from going...

Asked on 02/17/2021 by Mat NX

0 answer

Control system theory - Nyquist - How is affected the Nyquist plot?

I am trying to understand the Nyquist theory for knowing if a system is stable. Here is what I know : A system is unstable when the open loop transfer...

Asked on 02/17/2021

0 answer

Convergence of $c^* Ac$ in second quantization

Let $A$ denote a bounded operator on a complex separable Hilbert space $mathscr{H}$. Let $mathscr{F} = bigoplus mathscr{F}_N$ be the Fock space generated by $mathscr{H}$ where...

Asked on 02/17/2021

0 answer

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