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If an object on a rough plane moves from A to B with negative acceleration -8m/s/s (due to friction). And back from B to A on that same surface, why...
Asked on 06/11/2021 by sweetie sakura
6 answerI always meet the word "reservoir", such as electron reservoir.I was wondering what exactly the reservoir is. Does it mean a metal that provides electrons?...
Asked on 06/11/2021
1 answerWe have two fixed point charges in space, the charges be +Q and -q. Is it possible to find a location and velocity of release of a point charge +q'...
Asked on 06/11/2021 by Avinandan Mondal ph20b005
2 answerThe momentum of a photon is $ p=E/c.$ When a photon reflects off a mirror, it is elastic scattering. Elastic scattering should keep the energy of the photon. But...
Asked on 06/11/2021
5 answerTL;DR: Why can't we write $mathcal{L} = E - 2V$ where $E = T + V = $ Total Energy? Let us consider the case of a particle...
Asked on 06/11/2021 by NiKS001
3 answerFor a given interaction term, say $frac12gvarphi^2psi$, how would one find the one loop diagram that contributes to its self energy of $varphi$? I think it would just...
Asked on 06/11/2021 by steven1234
0 answerTwo questions ...why is it that increasing the mass of a mass-spring system increases the resonance amplitude? And why is it that increasing mass causes its resonance curve to be...
Asked on 06/11/2021 by gummybear03
2 answerWhen we learnt about the Hubble Constant at school we were taught that Hubble had observed Red Shift due to the Doppler Effect, and thus the universe (and space time...
Asked on 06/11/2021 by Matt Smallwood
1 answerMuch of the Keldysh formalism is based on the following identity$$G^{T}(t,t') + G^{tilde{T}}(t,t') = G^{<}(t,t') + G^{>}(t,t'),$$which using their defintions is equivalent to$$G^{text{cl,cl}}(t,t') equiv ilangle...
Asked on 06/11/2021 by Jan Cillié Louw
1 answerThis concept was a bit hard to grasp, because I'm bad at seeing the real-world implications of multiplication. Division makes sense, but multiplication is harder for me. Pressure-volume work is...
Asked on 06/11/2021
3 answerGet help from others!
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