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Physics : Recent Questions and Answers (Page 706)

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

How to derive Euler-Lagrange equation for isochronous curve of Leibniz in terms of $t$, $x(t)$, $dot{x}(t)$?

According to this source, "An isochronous curve of Leibniz is a curve such that if a particle comes down along it by the pull of gravity, the...

Asked on 12/26/2020 by Beau Horenberger

2 answer

The dual of a surface element in 4-space

In reading the classic text, "The Classical Theory of Fields", Third Edition, by Landau and Lifschitz, I found an "obvious" statement not so obvious to me. It is on...

Asked on 12/26/2020

1 answer

Why do eigenvalues correspond to observable quantities?

It makes sense to me that we can find some operator that gives us eigenfunctions that correspond to definite values for some desired observable. However, I do not see how...

Asked on 12/26/2020 by Jeff Bass

5 answer

Visualization of time curvature of spacetime

The Flamm's paraboloid is a slice of the Schwarzschild metric by two spatial dimensions. This shows the space dilation, but without the time component doesn't really give...

Asked on 12/26/2020 by Jan Hudec

1 answer

Discharging of a capacitor

Consider a charged capacitor with its positive plate holding charge Q. Now I join the capacitor to an circuit with resistance R . So the capacitor starts to discharge. Small...

Asked on 12/26/2020

1 answer

Infinitesimal Translation Operator

In the book "Modern Quantum Mechanics" (by J.J. Sakurai and Jim Napolitano) page 44, infinitesimal Translation operator is given:$mathscr{J}left(d mathbf{x}^{prime}right)left|mathbf{x}^{prime}rightrangle=left|mathbf{x}^{prime}+d mathbf{x}^{prime}rightrangle$ after this, book mentioned properties of the...

Asked on 12/26/2020 by Butane

1 answer

Adding two tensors in different coordinate systems

I have difficulties understanding the following (Everything out of the book Gravity by Poisson and Clifford): We have a quantity $mathfrak{g}^{alpha beta}$ called gothic inverse metric in prior unspecified...

Asked on 12/26/2020 by schoeni

0 answer

The calculation of effective mass for silicon

From what it was written, the calculation of effective mass in semiconductor had two different types, one is effective mass for density of states, through geometrical...

Asked on 12/26/2020 by ShoutOutAndCalculate

0 answer

Is there a force that a body experiences as it approaches light speed?

My question can be boiled down to a thought experiment.Assume you have a space ship in an empty universe. This space ship is capable of a constant $1 m/s^2$...

Asked on 12/26/2020 by Ej Sizemore

3 answer

Calculating equation of motion in gauge theories: using ordinary derivatives or covariant derivatives?

For general gauge theories, the total Lagrangian density is given as $$L=-frac{1}{4}F^2+L_M(psi, Dpsi)$$ where $L_M(psi, Dpsi)$ is the matter field with the ordinary derivative replaced by the covariant...

Asked on 12/26/2020

1 answer

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