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I am looking at some mathematics of HelmHoltz free energy. Naturally, wikipedia is one of the (hopefully) more reliable sources of information. In its derivation section,...
Asked on 09/03/2020 by Neoh
1 answerI am having a problem with an expansion that should be simple. Let's say I solve Maxwell equations in vacuum, but in spherical coordinates. The solutions of the TM family...
Asked on 09/03/2020 by photonQ
1 answerAccording to Hecht's Optics book, the reflectance, $R$, and the transmittance, $T$, are defined as the ratios of the incident power and the reflected and the transmitted powers,...
Asked on 09/02/2020
0 answerI need help with calculating the uncertainty of the refractive index of air which has been obtained by the equation in this document:$$n_{text{air,atm}}=(frac{N}{P/P_{text{atm}}})(frac{lambda}{2L})+n_{text{vacuum}}$$ My experiment...
Asked on 09/02/2020 by Cinna
1 answerWhy boundaries for radius between internal and external conductor are set to$a leq r < b$ instead of $a leq r leq b$?Example: An air coaxial...
Asked on 09/02/2020 by Pavle
1 answerI'm trying to derive the expression of the time evolution operator, $hat U$, in terms of the Hamiltonian of a system, $hat H$. This operator $hat U$...
Asked on 09/02/2020 by user266148
1 answerI have strap ratchet which is being pulled on both sides with some force(say 500lb). Could some one please help me know the force to be applied on the handle...
Asked on 09/02/2020 by jaisingh
1 answerIn reading this article about the origins of elements, I found the following diagram: What strikes me about...
Asked on 09/02/2020 by spender
2 answerWhat the characteristic force isDimensional analysis has an interesting result in fluid mechanics: the quantity $chi=eta^2/rho$ has the units of force, where $eta$ is the usual dynamic viscosity....
Asked on 09/02/2020 by CR Drost
0 answerI come across the terms "equations of motion" and "field equations" all the time, but what is the difference? For example, general relativity is described in terms of the Einstein...
Asked on 09/02/2020 by Superbee
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