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Physics : Recent Questions and Answers (Page 139)

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

Lagrangian mechanics formulation of a simple free motion of two masses in uniform gravity field

As a part of larger project, I decided to test my Lagrangian formulation of simple system of two rigidly connected point masses as indicated below. ...

Asked on 08/03/2021 by Aleksander Fiuk

2 answer

Conductivity and loss in electromagnetic waves

I have learned electromagnetic waves in a free space (conductiviy=0) propogates without loss.But if medium have conductivity there are 2 cases good insilator case and good conductor case....

Asked on 08/03/2021 by Tesla058

1 answer

Diagonal Tensor

I want to do some calculations for anisotropic properties. The software I am using only takes a tensor matrix as an input. Now to my question. I have 3 literature...

Asked on 08/03/2021 by Sommerfeld

0 answer

Precessional motion of a spinning top

In Feynman's book, when he talks about the motion of a rapidly spinning top, he mentions:"When we apply a Torque to a rapidly spinning top, the direction of the precessional...

Asked on 08/03/2021

1 answer

Finding de-Sitter Schwarzschild Metric

Given the metric in Schwarzschild coordinates $$d s^{2}=-e^{2 Phi(r)} d t^{2}+e^{2 Lambda(r)} d r^{2}+r^{2} d Omega^{2}$$ and a vacuum Einstein equation with cosmological constant given by: $$G_{mu nu}=-frac{3}{L^{2}}...

Asked on 08/03/2021 by user243050

1 answer

Why the torque on Earth is zero if it's assumed to be spherical

Kleppner and Kolenkow Introduction to mechanicsIn the approximation that the Earth isspherical, it experiences no torque from nearby bodies. Consequently,its angular momentum is constant—both its spin and its...

Asked on 08/03/2021

3 answer

Tetrad formalism vs coordinate formalism example

Sources I have been reading Chapter 11 and 25 of Andrew Hamilton's amazing notes which has some material on tetrad formalism in general relativity...

Asked on 08/03/2021

1 answer

Phase shifted Optical Fiber Bragg grating Response

As we know there is a narrow notch in the reflectance spectrum of a Phase shifted FBG. We have Bragg condition for reflected band of any uniform FBG. My question...

Asked on 08/03/2021

1 answer

How is the voltage in this parallel circuit different across each component?

I'm studying up on circuit calculations and came across this circuit: I was taught that voltage in a parallel circuit is...

Asked on 08/03/2021 by Ceecee

1 answer

Given that light spreads out as it travels, why do distant objects appear smaller than nearer objects?

I realize this might be a silly question but it is plainly true that, for example, a lighthouse beacon or any powerful light source, produces a much larger "spot" the...

Asked on 08/03/2021

2 answer

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