Physics Questions, Problems & Solutions : TransWikia.com ~ Page 772

Could dark energy just be another characteristic of the gravitational force?

Recent observations of the accelerating expansion of the universe have been quantified and for the time being given a name as to the cause: Dark Energy. And from what I've...

Asked on 12/03/2020 by docscience

2 answer

Express Laplace transform of voltage across a capacitor in terms of charge

In Charge Tunneling Rates in Ultrasmall Junctions section 2.1, the authors consider the problem of charge relaxation in a simple circuit shown in Figure A.The implicitly...

Asked on 12/03/2020 by DanielSank

2 answer

Can we theoretically balance a perfectly symmetrical pencil on its one-atom tip?

I was asked by an undergrad student about this question. I think if we were to take away air molecules around the pencil and cool it to absolute zero, that...

Asked on 12/03/2020 by TBBT

10 answer

Steps to calculate the near-field diffraction pattern after an aperture (for distances so close that the Fresnel regime is not valid)?

This question has arisen out of a previous question regarding the various approximations in optical diffraction theory, and when they can each be applied. I would like to know...

Asked on 12/03/2020 by teeeeee

1 answer

What does it mean to assign group operations to distinct sets for space groups?

I am trying to understand space groups in crystallography. In Internation tables for crystallography, for a nonsymmorphic space group, they list some symmetry operations. 8 of them are listed under...

Asked on 12/03/2020 by B. Brekke

0 answer

Cassegrain telescope design

How are the dimensions of a cassegrain telescope configured? In particular the distance of the secondary hyperbolic mirror from the primary mirror and also the diameter of the secondary mirror....

Asked on 12/03/2020 by T.J.Morris

0 answer

Gradient with respect to a function involving Schrodinger equation

For a general $N$-level closed quantum system, the control objective $J$ associated with an observable $O$ at the final time $T/2$ can be defined by...

Asked on 12/03/2020 by Junk Warrior

0 answer

Lifetime of quasiparticles in propagators

I have a rather technical question about lifetimes and propagators. The definition of the single particle propagator is: $g(r, r', t, t') = -i <Psi_{0}^{N}|T[psi(t, r)psi^{dagger}(t', r')]|Psi_{0}^{N}> = -...

Asked on 12/03/2020

0 answer

How does normal force work?

From what i read:Normal force is the force that prevents objects from passing through eachother,which is the force of the repulsionfrom the charge.The normal force will get as large...

Asked on 12/03/2020 by simple

3 answer

Unstable Equilibrium of hinged rods

I conjured up a scenario where there are two rods free to rotate about a hinge connected by their ends by spring of spring constant $k$,both their masses...

Asked on 12/02/2020 by physics lover

0 answer

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