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If I leave a bar of a radioactive material (e.g. uranium-235) for its half-life time, how will the bar look after halving its mass?Will it:stay the same size, but...
Asked on 06/26/2021 by SørenHN
1 answerAccording to Wikipedia lift in an aircraft is due to an area of low pressure formed above the wings of an aircraft due to the fast moving air there. So...
Asked on 06/26/2021
11 answerExample 3.8: An uncharged metal sphere of radius R is placed in an otherwise uniform electric field $vec{E} = E_o hat{z}$. The field will push the positive charge to...
Asked on 06/26/2021 by Anu3082
2 answerAnother similar stack assumes the absence of the mass and the friction of the piston, but makes no specification regarding the change in temperature in the syringe.Here, we...
Asked on 06/26/2021
2 answerLet's consider a polymer that is formed by an horizontal linear chain of $N$ disc-shaped monomers. Each monomer can either adopt either a vertical alignment (with length $l_1$...
Asked on 06/26/2021
1 answerIn Griffiths electrodynamics example 3.3 we've to find potential in a region subject to the conditions(i) $quad V=0$ when $y=0$(ii) $V=0$ when $y=a$(iii)...
Asked on 06/26/2021
1 answerI find two versions of the Cauchy momentum equation (1, 2):$$rho frac{Dvec{v}}{Dt}=rhovec{g} - nabla{p} + munabla^2vec{v}$$$$rho frac{Dvec{v}}{Dt}=rhovec{g}...
Asked on 06/26/2021 by plasmaQ
1 answerIs it possible to reveal a slight change in frequency of Voyager 1 and 2 signals due to Hubble flow effect? As both are about 1 light-day from Earth and...
Asked on 06/26/2021
1 answerI'm dealing with some extension of GR, with action: $S=int d^4xBig[sqrt{-g} f(R,R_{munu}R^{munu})$ Varying this action gives: $delta S=int d^4xBig[deltasqrt{-g} f(R,R_{munu}R^{munu})+sqrt{-g} (delta R f_R+ delta(R_{munu}R^{munu})f_Y)$where $Y=R_{munu}R^{munu}$ and...
Asked on 06/26/2021
1 answerA few experimenters have at one time or another claimed that quantum tunnelling allows the transfer of information or energy at superluminal speeds. One was the idea that music was...
Asked on 06/26/2021
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