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Does a closed cage with an helium balloon weigh the same as an empty closed cage?What if the balloon isn't touching the ceiling ? (It's a tall cage and...
Asked on 05/13/2021 by Shmoopy
2 answerI'm an A2 igsce math student and I'm taking mechanics for the first time in math this session. However, I was adviced to ask this question in the physics forum...
Asked on 05/13/2021
2 answerI'm very unexperienced in QFT, but I'm reading Salmhofer's book on renormalization and, at the very begining of the book, he discusses Feynamn path integral formulation on...
Asked on 05/13/2021 by IamWill
1 answerSuppose a massless, frictionless piston assembly initially has a higher pressure than the external (atmospheric) pressure, and it is pinned so that the piston does not move. Once the pin...
Asked on 05/13/2021 by Jeong Won Kim
5 answerFor the free fermion system in two-dimensional square lattice, we add the $pi$ flux in each plateau:$$H=-t sum_{langle i, jrangle} e^{i A_{i, j}} c_{i}^{dagger} c_{j}+h . c...
Asked on 05/13/2021
0 answerHere's the setup: The textbook, where this is from, first walks through how to find the strain and stress as...
Asked on 05/13/2021 by StormRyder
2 answerLet $Phi$ be a CPTP map on density operators for a fixed $n-$dimensional state space and fix a basis ${ | jrangle }$. I'm trying to understand...
Asked on 05/13/2021
0 answerNotationI'll be using Hubert Hahn's notation for my question. Hahn has an algebraic treatment of all values.$omega_{GN}^{G}$ is the angular velocity of frame $G$ with respect to frame...
Asked on 05/13/2021
1 answerA boy jumps from rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass...
Asked on 05/13/2021 by HateThisPlatoform
1 answerFor a charge that sits in an external magnetic field without moving, why is there no magnetic force on the charge?...
Asked on 05/13/2021 by karthik1231
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