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When reading about Astra satellites on Wikipedia (https://en.wikipedia.org/wiki/Astra_1KR), I saw that the period of the Astra 1KR satellite, positioned at 19.2° E, is 1,436.1 minutes (source: ...
Asked on 07/05/2021 by fbitterlich
1 answerMy teacher keeps saying that, in a head-on elastic collision of two bodies of equal masses, the velocities get exchanged. But consider two balls of equal mass moving with the...
Asked on 07/05/2021
3 answerI know similar questions have been asked before, but I was thinking about this and curious if it's a valid way to approach the question -- especially when we are...
Asked on 07/05/2021
0 answerGiven two density matrices $rho_1,rho_2$ (let them be finite dimensional). I try to show that $mathrm{Tr}((rho_1-rho_2)^2) = 0 implies rho_1 = rho_2$. What I tried is the following....
Asked on 07/05/2021
2 answerI'm trying to wrap my head around section 2.2.6 (on variational principles) in the following paper (on the inverse Ising problem): https://arxiv.org/abs/1702.01522 Here the authors explain how...
Asked on 07/04/2021 by Gauss57
1 answerThis question is from Griffiths' Electrodynamics, Chapter 2, question 49, part e). The question is as follows:Problem 2.49 Imagine that new and extraordinarily precise measurements have revealed an error in...
Asked on 07/04/2021
1 answerIs reverberation caused by echo? Is echo the thing that we hear inside of our rooms? Or is it reverberation? Once such definition states that -Reverberation is the persistence of...
Asked on 07/04/2021 by Ashvith Shetty
2 answerIn the double slit experiment, the interference pattern depends on the wavelength of the light. But if I run at the light source really fast shouldn't the light blue shift...
Asked on 07/04/2021
1 answerHow can we explain the bending of light when it moves through different optical media by Maxwell's equations treating light as an electromagnetic wave?...
Asked on 07/04/2021 by Ganesh Khadanga
4 answerIn "The Order of Time" (page 12), Carlo Rovelli explains how things fall due to the slowing down of time and uses the following metaphor:"Where time passes uniformly, in interplanetary...
Asked on 07/04/2021
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