Physics Questions, Problems & Solutions : TransWikia.com ~ Page 708

Can one force the octupole moments of a charge distribution (neutral and with vanishing dipole moment) to vanish using a suitable translation?

In a previous question, I noted that if you have a charge distribution with nonzero charge, then it is possible to choose an origin (at the centre of charge)...

Asked on 12/26/2020 by Emilio Pisanty

1 answer

Right-Angle Lever Paradox where does the ang. momentum go?

I was looking at the explanation to the 'right-angle lever paradox' as explained in Franklin, 2008 (link to arxiv paper). He argues that the reason behind the...

Asked on 12/26/2020

2 answer

Can Thevenin voltage ever be negative?

So in context of Thevenin's and Norton's theorem, can Thevenin voltage $V_{th}$, as in http://en.wikipedia.org/wiki/Thevenin_theorem, ever be negative? I know that $R_{th}$ can be negative, but never thought...

Asked on 12/26/2020 by user56220

1 answer

Variations wrt. Time Derivatives

I've been working on my dynamics homework when I've run into confusion with derivatives and could use some help regarding that. The question is as follows: When varying a functional...

Asked on 12/26/2020 by Chip

3 answer

Deformable body under a force and a moment

I am stuck in solving this problem. It seems that I should break it into elements (dx,dy) and then integrate somehow, but I just don't know how to start. Any...

Asked on 12/26/2020

0 answer

Is the pressure in a pipe equal the pressure in the tank?

In my example, there is a tank which is holding gas under pressure. Connected to this tank is an output pipe. Assuming the pipe is the same diameter for the...

Asked on 12/26/2020 by PhysicsGuy123

1 answer

SDE with drift multiplied by telegraph like random process

Let the stochastic process ${X_t}$ be defined by the following SDE (Ito's convention for discretization) $dX_t=frac{1}{p}S_tg(X_t)dt+sqrt{2}dW_t$ where $W_t$ is a standard Wiener process, $g: mathrm{R}rightarrow mathrm{R}$...

Asked on 12/26/2020 by ernst

1 answer

Energy dependence in density functional theory

According to the Kohn-Sham first theorem, the ground state energy of an electron system could be written as a function of the electron density$$E = E[n]$$And we...

Asked on 12/26/2020

1 answer

Potential Energy of a System of Point Charges

Is the potential energy of an isolated system of point charges placed in a bounded space in equilibrium necessarily zero? ...

Asked on 12/25/2020 by iAmSecretlyFlash

0 answer

How do two light beams, one squeezed in phase and the other in amplitude, superposed on a beamsplitter, result in an EPR entangled state?

I have found this information in Section 4 of this paper: https://www.degruyter.com/view/journals/nanoph/5/3/article-p469.xml?language=en Also on Wikipedia https://en.wikipedia.org/wiki/Squeezed_states_of_light#Entanglement-based_quantum_key_distribution And here in Figure 1 ...

Asked on 12/25/2020 by Quantum Journalist

0 answer

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