Physics Questions, Problems & Solutions : TransWikia.com ~ Page 185

Calculating the moment of inertia for a composite cylinder of different densities

I am working on a project where I am using a composite cylinder composed of a cylindrical core surrounded by a cylindrical tube, where the two components have different densities....

Asked on 07/15/2021 by Harry Hu

1 answer

$hat{phi}$ tidal acceleration of a black hole

For Schwarzchild geometry I've calculated the tidal acceleration in the $hat{phi}$ direction for two particles initially at rest separated by $Delta phi.$$$a^a = -R_{cbd}{}^aX^b T^c T^d$$...

Asked on 07/15/2021

0 answer

Dresselhaus linear and cubic terms

I've been trying to understand Dresselhaus effect, described here. I've been looking up references to find when the cubic term becomes more dominant than the linear term...

Asked on 07/14/2021

1 answer

Steady state model prediction of number of radiogalaxies as a function of time

What does the Steady State model predict about the number of radiogalaxies per unit volume as a function of time? How to derive an expression for the diﬀerential number counts...

Asked on 07/14/2021 by DaveSinclare222

0 answer

What exactly is moment? Why does it correspond to a rotation?

Wikipedia says:Moment is an expression involving the product of a distance and physical quantity.I don't quite get it. Moment is a vector, the cross product of the...

Asked on 07/14/2021 by Triet Vo Nguyen Minh

2 answer

Definition of the refractive index

My textbook says the absolute refractive index of a medium $$n = dfrac{c}{v}$$ where $c$ is the speed of light in vacuum and $v$ is the...

Asked on 07/14/2021

3 answer

Massive states of the closed bosonic string fitting into a representation of $SO(D-1)$

It is usually shown in the literature that massive light-cone gauge states for a closed bosonic string combine at mass level $N=tilde{N}=2$ into representations of the little group $SO(D-1)$ and...

Asked on 07/14/2021

1 answer

Elegant theoretical way(s) to prove the $U(1)$ electric charge of electron + proton $Q_e+Q_p=0$?

In Zee's QFT in Nutshell book p/410, he uses the following method to show $U(1)$ electric charge of proton + electron $$Q_e+Q_p=0$$ in Grand Unified Theory (GUT): ...

Asked on 07/14/2021

1 answer

Silicon Nano materials

Bulk Si has indirect bandgap structure. But when we make Si into nano particles it behaves like a direct bandgap. Why?...

Asked on 07/14/2021 by Rahul Patel

1 answer

QFT - Allowed transitions for a given vertex

I'm given the following Lagrangian : $$ L = L_{f1 }(psi_1, barpsi_1) + L_{f2}(psi_2, barpsi_2) + lambda (barpsi_1 gamma^{mu} psi_2) (barpsi_2 gamma_{mu} psi_1) $$ where $L_{fi}$ are two...

Asked on 07/14/2021 by Boreanaz

0 answer

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