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Physics : Recent Questions and Answers (Page 116)

Find answers to your questions about Physics or help others by answering their Physics questions.

Parallel shift in polar coordinates and Christoffel Symbols

I've been looking at the Christoffel Symbols for parallel shift in polar coordinates. Therefore I used the general basis vectors: $vec{q}_r=vec{e}_r$; $vec{q}_varphi=rcdotvec{e}_varphi$ I looked at a carthesian vector...

Asked on 08/12/2021

0 answer

Sign convension in shell momentum balance

I was trying to understanding the shell momentum balance from https://www.youtube.com/watch?v=sMsw8BPT578. At 26:25 if you see the teacher is saying momentum in - out. Although I have...

Asked on 08/12/2021 by Vishesh Mangla

0 answer

Hamiltonian with ext. vector potential - complex kinetic energy

in a given (TD)DFT code with an atomic basis set, i.e.$$psi(mathbf{r},t) = sum_i c_i(t) phi_i(mathbf{r})$$(where the non-on-site basis functions $phi_i$ aren't necessarily orthogonal), the kinetic energy...

Asked on 08/12/2021

2 answer

Is there a physical quantity related to all seven fundamental dimensions?

For example, the dimensions of the universal gas constant come close: only luminous intensity and current are excluded. $$ mathsf{M} mathsf{L}^2 mathsf{T}^{-2} mathsf{Theta}^{-1} mathsf{N}^{-1} $$ Is there any derived...

Asked on 08/12/2021

0 answer

A general question about precession

Does precession (of a top for example) occur only whenever the angular velocity vector is not parallel to a principal axis? I have yet found any clear...

Asked on 08/12/2021

1 answer

The value of the driving frequency at which the voltage across the capacitor becomes maximum in a series RLC ac fed circuit

The circuit diagram is as shown. As per the book voltage across the capacitor is maximum during resonance that is p=1/√(LC) But what I found out is a bit different...

Asked on 08/12/2021

3 answer

Work to induce charge on grounded conductors

I'm currently studying Method of Images in Griffiths book and in section 3.2 he introduces the method of images for a point charge at a distance $d$ from a...

Asked on 08/12/2021 by Little Gravity

1 answer

Canonical momentum not observable vs energy is observable

I have seen explanations that canonical momentum for charged particles $p = mv + qA/c$ is not a measurable quantity/observable because it is not gauge invariant. However, there are...

Asked on 08/12/2021 by suncup224

1 answer

High order derivatives and their impacts to a system

I'm trying to understand how high-order derivatives (Jerk, Snap, Crack, Pop and onward) impact a system and their implications to analysis. I have used Jerk in the past when considering...

Asked on 08/12/2021

1 answer

What effects would a finding of Gravitational Repulsion Between Matter and Anti-Matter in the ALPHA Experiment have on Mainstream Theory?

The actual nature of the gravitational force between matter and anti-matter (attractive or repulsive) remains unsettled: See Are there experiments taking place right now that might show evidence...

Asked on 08/12/2021

1 answer

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