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Physics : Recent Questions and Answers (Page 221)

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

Force balance for belt-pulley-mass model (2nd order response system)

I am trying to model a mass being driven by a motor (Angular acceleration $dot{omega}$ and shaft-polar modulus $J$) with belts and pulleys. This is then being compared to numerical...

Asked on 07/01/2021 by dearN

1 answer

Why "colours" of light are given in wavelength not frequency?

If I understand correctly, when a beam of (monochromatic) light passes through media of different refractive indices, its wavelength changes but frequency remains constant. Why, then, are colours of light...

Asked on 07/01/2021

1 answer

Why the transition of electron from an excited state to metastable state in a lasing medium is radiation less?

When an electron transitions from an excited state to the metastable state, no radiation is emitted i.e. a radiationless transition. My question is: Where does the energy difference between excited...

Asked on 07/01/2021

1 answer

Can I write the scattering condition in this form?

Consider the elastic scattering of a particle, which can be represneted by a plane wave with wave vector $mathbf k$, from a periodic potential. We know that $mathbf{k}$...

Asked on 07/01/2021

1 answer

Finding Mutual Capacitance of Two Identical Metal Spherical Balls?

It is a question from the Irodov:Find the capacitance of a system of two identical metal balls of radius $a$ if the distance between their centres is equal to...

Asked on 07/01/2021

1 answer

How can a spinning body *suddenly* change angular momentum/KE when transitioning its axes (intersecting ellipsoids in the intermediate axis theorem)

This video illustrates the Intermediate Axis Theorem by showing that the system of rotations is confined to the the intersection of the ellipsoid representing angular momentum ...

Asked on 07/01/2021

0 answer

Can we measure an electromagnetic field?

As far as I can check, the Aharonov-Bohm effect is not -- contrary to what is claimed in the historical paper -- a demonstration that the vector potential $A$ has...

Asked on 07/01/2021 by FraSchelle

5 answer

Changing white light to blue light without filter?

This may sound like a daft question, considering a filter would be the easiest way to make this change. However, I was wondering if white light could be changed into...

Asked on 07/01/2021 by Snfkin

3 answer

Relation between velocity and position vector in a central force

I am aware that the dot product of the position and velocity vector, $(vec{r}cdotvec{v})$, in circular motion under a central force, $F(r)=-frac{k}{r^2}$, is equal to zero as the...

Asked on 07/01/2021

2 answer

Complicated partition function emerges from simple constraints

I'm working on a statistical model which involves many degrees of freedom $?=1...?$. Each degree of freedom is described by a gamma distribution with its own parameters, which we...

Asked on 07/01/2021 by jeaster

1 answer

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