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If I refer well (I'm not a physicist) one of the oldest uses/applications of renewable energy is to try to exploit the wind and tides by means of designs of...
Asked on 08/02/2021
0 answerA very different version of Bell's spaceship paradox hit upon my mind for which I cannot find a convincing solution: Two stationary spaceships are connected with a spring as shown...
Asked on 08/02/2021
2 answerIn answer to this question it is stated that:In summary, warp drives move because they already move, or else they need to propel, and their movement is not related...
Asked on 08/02/2021
0 answerI studied that in Young's Double Slit Experiment the variation of intensity ($I$) of the fringes on the screen with respect to the phase difference ($Φ$) is given...
Asked on 08/02/2021
3 answerim trying to understand the meaning of this inner product: $⟨psi_a|H|psi_b⟩$. $H$ can be a time-independent hamiltonian. I know that $⟨psi_a|H|psi_a⟩$ is the expectation value, but I...
Asked on 08/02/2021
2 answerI understand that the linear matter power spectrum is given by (Dodelson, Modern Cosmology): $$P_L(k) = P_R(k)dfrac{4}{25}dfrac{k^4}{Omega_m H_0^2}T^2(k)D_+(a),$$ where $P_R(k) = (2pi^2/k^3)A_s(k/k_p)^{n_s-1}$, $D_+(a)$ is the growth rate,...
Asked on 08/02/2021 by apprentice
0 answerA half pipe of a skateboard park consists of a concrete trough with a semicircular section of radius 5m, I hold a frictionless skateboard on the side of the trough,...
Asked on 08/02/2021 by Igor Westfal
2 answerI've seen several examples of phase space functions whose Poisson brackets (or Dirac brackets) have the same algebra as the Lie algebra of some symmetry. For example, for plain old...
Asked on 08/02/2021 by duetosymmetry
3 answerAccording to Sellmeier's formula, the dispersion formula of a transparent material can be written as$$n^2(lambda) = 1 +sum_ifrac{B_i lambda^2}{lambda^2 - C_i},$$ where $B_i$ and...
Asked on 08/02/2021
1 answerDoes increase in kinetic energy of a car increase its temperature considering it is moving in an ideal condition where there is no friction or air resistance? If it is...
Asked on 08/02/2021 by MSKB
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