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246,758 questions
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How to analyze 1D forced oscillations in a string that is attached to a small body that can slide up and down a pole? What if the body
How to analyze 1D forced oscillations in a string that is attached to a small body that can slide up and down a pole? What if the body is attached to a spring with spring constant of k?
What i'm ...
2
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A paradox of the precession of a stick
I can see that a heavy flywheel around an axis experiences precession. But when I look at the equation:
$$ \dot{\omega} = (I \omega) \times \omega + \tau ,$$
where $\omega$ is angular velocity in the ...
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You can flow cooling the chip? [closed]
I tried to install processor without frame in socket, but couldn't.
Need frame for installation processor in desktop socket?
Gremni intel core and midi amd smear the cream processor cap:
But need ...
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0
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Coordinate Transformations in General Relativity Typo
In Böhmer's "Introduction to General Relativity and Cosmololgy" there's a section (p18) that gives an example of proper transformation properties for a (1,1) tensor,
He previously derives
$$
...
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Quasi-particle energies and lifetimes from a given retarded Green's function
I have some problems interpretating the results from a standard exercise given in a many-body physics course. I have a one electron retarded Green's function of a system of interacting fermions
$$ G_{...
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Pressure of liquid in a problem related to capillary tubes from 200 Puzzling problems in physics
I was going through the book 200 Puzzling Problems in Physics. I have a doubt in the solution given to Q29.
P29. Water which wets the walls of a vertical capillary tube rises to a height $H$ within ...
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Disordered hyperuniformity misunderstanding
I’m interested in disordered hyperuniformity. Studied Torquato’s articles and corresponded with him, but especially grateful to Diala Hawat for detailed advice on correct calculation of scattering ...
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Heat Death - Does it only apply to the observeable universe?
Background and what I have tried
I did search on Physics Stack Exchange after it, but I didn't find any relevant ones.
For example these
Is heat death observable?
How does the heat death looks like ...
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1
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Is it possible to measure the complex permittivity of a conductive powder, without including conductivity?
Let's say I have a conductive powder (e.g. graphite or magnetite) and want to measure the relative permittivity of the material, but without including the effect of conductivity. The EM wave equation ...
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1
answer
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On an identity concerning connected and disconnected diagrams (Peskin and Schroeder)
On pages 96-97 of Peskin & Schroeder, there is a proof of an identity, the exponentiation of disconnected diagrams. First, the book goes on explaining that a typical diagram is made up of ...
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Finding the refraction effect of waves [closed]
Period: T
Angular frequency: w = 2*pi/T
Wavelength: lambda = 2*pi/k
Wavenumber: k
Water depth: h
Amplitude: A (so wave height H = 2*A)
Acceleration due to gravity: g
The phase velocity and group ...
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1
answer
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Can AI autonomously generate valid and original physical theories? [closed]
I came across a concrete example that raises an intriguing question. I have a PDF containing a complete physical theory generated entirely by an artificial intelligence. The AI produced the equations, ...
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Accurate internal visualization of physics without training?) [closed]
I have never studied plasma physics, general relativity, or high-energy physics in university, yet when I “look inside” certain systems in my mind, the pictures match published simulations and ...
4
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Is there an accepted solution to the Klein paradox in terms of QFT?
The Klein paradox occurs in relativistic quantum mechanics when dealing with the single-particle picture. Usually the solution is said to be solved by quantum field theory (QFT). What is the solution? ...
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Electric potential of a spherical shell [duplicate]
To find the electric potential of a uniformly-charged spherical shell at surface, we use formula $V=kq/r$, and potential inside is the same (as $V$ is constant). But according to Gauss's law, inside ...
