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In example 5.5 from Kleppner Kolenkow (2nd edition), the general case of finding the escape velocity of a mass $m$ projected from the earth at an angle $alpha$...
Asked on 06/29/2021 by DancingIceCream
1 answerSuppose a galaxy is headed beyond the cosmological event horizon. Photons it emits now will eventually reach us, but there is a point at which photons will no longer be...
Asked on 06/29/2021 by Eli Rose
1 answerIn page 53 of P&S, they postulate the commutation relations for the annihilation and creation operators of spin 1/2 particles. From there, they start computing the commutation relations of ...
Asked on 06/29/2021 by Javier Hernandez
0 answerI need to know the ground state energy $E_0$ defined by the following stationary Schrodinger equation:$$-frac{a}{2}phi''(xi) + left(frac1{2a}sinh^2(2xi) + (2b-1)cosh(2xi)right)phi(xi) = E_0 phi(xi).$$Here ...
Asked on 06/29/2021
0 answerI am a high school student and recently heard of S. R. so I am excited to know what are its effect on sine wave in a string. Is there...
Asked on 06/29/2021 by Rajshekhar Singh
1 answerI am using an online simulation for a lab concerning Centripetal Acceleration. When I change the mass the graph indicates that the magnitude of the acceleration is constant. According to...
Asked on 06/29/2021 by Omega28
6 answerIn the article Cosmic abundances of stable particles: Improved analysis, P. Gondolo and G. Gelmini, Nucl. Phys. B 360 (1991), p. 145-179, they convert $rm{d}^3p_1rm{d}^3p_2=2pi^2p_1p_2rm{d}E_1rm{d}E_2rm{d}cos{theta}$ (eq.3.2) into ...
Asked on 06/29/2021 by Adri Escañuela
1 answerConsider a fixed-target-experiment, where negatively charged pions are shot at protons (the latter being at rest). The kinetic energy of the pions shall be known. One possible reaction is ...
Asked on 06/29/2021 by Philippe Knecht
1 answerIf the energy of $1 , mathrm{bit}$ of information is $k_{small{text{B}}}T ln{2}$, then the energy of that bit increases with the temperature...
Asked on 06/29/2021
1 answerThis is similar to this question: Is the converse of Noether's first theorem true: Every conservation law has a symmetry?. However, the answer given there is very technical and...
Asked on 06/29/2021
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