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I read here that a black hole with a mass of the observable universe, $M=8.8times10^{52}kg$, would have a Schwarzschild radius of $r_s=13.7$ billion lightyears. I immediately...
Asked on 12/14/2020
0 answerI am wondering whether the moment of inertia about a pivot at one of its ends of a non-uniform rod can be calculated using the following equation:$$frac{1}{3}ML^2$$...
Asked on 12/14/2020 by DuckTales
2 answerThis question is about topological string theory and it was also posted in MathOverflow. The existence of a new brane called "an NS-2 brane" is predicted in (the second...
Asked on 12/14/2020
0 answerTexts, such as Drela, Flight Vehicle Aerodynamics, indicate that the Kutta-Joukowski Theorem holds in compressible flow. Indeed, the KJT seems hold in linearized supersonic flow around a 2D flat...
Asked on 12/14/2020 by JZYL
0 answerIn the usual formulation of lattice gauge theories, one considers gauge variables on the links of a lattice (often hypercubic) taking value in some representation of a gauge group, ...
Asked on 12/14/2020
0 answerI have a hard time understanding why does earth have magnetic fields.My textbook reads:"The Earth's core is very hot and molten, and the ions of iron and nickel are...
Asked on 12/14/2020
1 answerWhen a capacitor discharges, the pd across it goes from V0 to 0 in a given time. But when you look at the pd across the fixed resistor, this too...
Asked on 12/14/2020 by math111
2 answerIn Hamiltonian mechanics, consider extended phase space, the trajectory followed by a particle in that space is formed by an intersection of different $2n$ dimensional surfaces, all of these...
Asked on 12/14/2020 by user208263
1 answerI have a question about modeling sky noise which should be filtered by a spatial filter 4f system. My approach for this task is to use a 2D array with...
Asked on 12/14/2020 by Nabla94
1 answerWhen the magnet, starting with the north pole, goes towards a coil of wire (maybe a solenoid???) the magnetic field within the wire changes polarity in order to repel the...
Asked on 12/14/2020
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