Physics Questions, Problems & Solutions : TransWikia.com ~ Page 693

CTC, determinism and valuedness of Riemann tensor

What I understood is that By the math, the Riemann tensor is obtained by parallel-transporting a vector along a closed curve in the considered space, then apply Stoke's theorem. Now...

Asked on 12/31/2020 by Julien Pitteloud

1 answer

How to calculate the optimum tilt angle for a solar panels?

I have been going research on how solar panel's tilt angle affects their efficiency. I have read some papers on the calculation of solar irradiance on tilted surfaces (...

Asked on 12/31/2020 by Adarsh Payyavula

0 answer

Using Casimir force as a thruster

In quantum mechanics, there is a phenomenon called the 'Casimir effect'. As two metal plates have a very small distance, the plates work as a potential well, causing limited wave...

Asked on 12/31/2020 by littlegiant

1 answer

Does the First law of thermodynamics hold if the final state is NOT in equilibrium?

So we know the first law of thermodynamics holds for isolated systems $$Delta E = W+Qtag{1}$$ Now assuming we are in a thermally isolated system such that $(Q=0)$...

Asked on 12/31/2020 by CatoMaths

1 answer

(Anti)commutators at different times

Why does the commutator of two operators evaluated at different times vanish? Take for instance a fermonic field $psi_sigma (vec{x},t)$, which satisfies the well known anti-commutation relations at...

Asked on 12/31/2020 by S-low

1 answer

How exactly do quantum numbers increase in relation to energy levels in more than one dimension?

When you have increasing energy levels in 2 or 3 dimensions how does the values of quantum numbers $n$ increase for each dimension? For example if you have ground...

Asked on 12/31/2020

2 answer

Voltage across rod in time varying magnetic field

If a slim conductor of some length $l$ and diameter $dll l$ is placed in a magnetic field $B$, and the field is changed by $frac...

Asked on 12/30/2020 by P2000

1 answer

Is liquified gas rate of vaporization dependent on the volume of the container?

I have a vessel 50% full of ammonia at outdoor temperature of 20F - 100F depending on time of year.This vessel will be evacuated with a compressor and the...

Asked on 12/30/2020

0 answer

Why do electrons in a cool gas not release photons as they are excited?

When white light is shone on a cool gas the electrons absorb photons of a certain wave lengths and become excited. Shouldn’t the electrons then return to ground and release...

Asked on 12/30/2020 by jfearn

1 answer

Euler’s Equations of Motion for a Rigid Body and Inertial Forces

Euler’s equations of motion for a rigid body can be interpreted as a rewriting of Newton’s second law for rotations in a rotating frame. They basically tell us the...

Asked on 12/30/2020 by user1760043

2 answer

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