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Suppose that we have a particle moving at $0.8 c$ (or even a photon) and it is just, say $2 times 10^{5} m$ away from the boundary of...
Asked on 09/04/2021
1 answerIf a spacetime has no timelike killing vector, how can we define "time" in such spacetime, in order to calculate the time evolution behaivor of some quantities in it?...
Asked on 09/04/2021
2 answerNote:- Figure is the screen shot from https://www.youtube.com/watch?v=ofgusnhQ07Q Doubt regarding the application of Newton's second law in...
Asked on 09/04/2021
4 answerThe coiled tungsten alloy filaments of incandescent heat up greatly in use. Eventually, they fatigue and fail. Lightbulbs are rated by an number of hours of use, but along with...
Asked on 09/03/2021
1 answerI've just started studying quantum mechanics, and I've come across this correlation between Pauli matrices ($sigma_i$) and quaternions which I can't grasp: namely, that $isigma_1$, $isigma_2$ and $isigma_3$, along with...
Asked on 09/03/2021 by dahemar
8 answerFrom high school physics we know the heat energy $Q$ given to a mass $m$ rises its temperature by $Delta T=dfrac{Q}{mc}$. When there is a vacuum, ...
Asked on 09/03/2021
1 answerI'm working on a problem in Kibble's Classical Mechanics (Chapter 11, Problem 12) and came upon a method for exploring the stability of an equilibrium point that I wasn't familiar...
Asked on 09/03/2021
0 answerEven when we cast Maxwell's Equations in as coordinate-independent form as possible, $dF=0$ and $d star F = J$, we still have to make use of the Hodge...
Asked on 09/03/2021 by DPatt
2 answerWhile I was watching a popular science lecture on YouTube, I came across this sentence"Sun is giving us a low entropy, not energy"which was said by Prof. Krzysztof...
Asked on 09/03/2021 by janusz
5 answerI need some help with this problem:A spool with thread wound on it, of mass $m$, rests on a rough horizontal surface. Its moment of inertia relative to its...
Asked on 09/03/2021 by davidllerenav
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