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Physics : Recent Questions and Answers (Page 85)

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

Expanding the Green's function in spherical harmonics

Hello and thanks for reading. I'm currently working through electrodynamics from Purcell supplemented by Jackson and online notes. I've read up the basic cases demonstrating the method of image charges,...

Asked on 08/29/2021 by abhibrata ganguly

1 answer

How does brain perceive time dilation due to gravity?

Einstein's General Relativity says gravity warps spacetime. Consider a hypothetical scenario:A person travels into space from Earth.He landed on a different planet in some far off galaxy where time runs...

Asked on 08/29/2021 by Gowtam Reddy

3 answer

Parallel transport: Lie derivative vs covariant derivative

Given a manifold, we can generalize the idea of derivatives in multiple ways: two of them being the Lie derivative and the covariant derivative. Whereas Lie derivatives do not require...

Asked on 08/29/2021

2 answer

Is it mathematically as well physically alright (consistent) to not quantize metric when doing QFT in curved spacetime?

I am not well-versed with the theory of renormalization of QFT as of now (I just know that when you redefine your observables you get rid of the UV divergences...

Asked on 08/29/2021

1 answer

Trying to intuitively understand Christoffel symbols

I recently watched Sean Carroll's YouTube series on "The Biggest Ideas in the Universe". In his Geometry and Topology video, he says that the connection in Riemannian geometry describes how...

Asked on 08/29/2021

1 answer

What equation can I use to calculate escape velocity as the radius increases from the Schwarzschild radius?

At the Schwarzschild radius, the escape velocity is the speed of light for all objects. However, I'm looking for an equation that will calculate the escape velocity as the radius...

Asked on 08/29/2021

1 answer

Single step vs multistep processes under constant pressures and ending at the same temperature?

So there was a throw away question that wanted us to calculate the difference in $q$ for a two step process vs single step. Went basically like this: Gas in...

Asked on 08/29/2021 by Random Hero

1 answer

Should negative pressure-thrust increase or decrease the nozzle-exit velocity of a rocket?

first post here. I've just started on George Sutton & Oscar Biblarz's Rocket Propulsion Elements and have stumbled upon contradictory solutions between the Eighth (PDF linked) and...

Asked on 08/28/2021 by angust

1 answer

Mixing Liquids of Certain Viscosity

I need a very small amount of 2 cSt liquid for an experiment I am doing, but I only have 5 cSt oil and water which has viscosity of 1...

Asked on 08/28/2021

0 answer

Are coherent states destroyed by measurements?

For a quantum harmonic oscillator in a coherent superposition, what happens if the energy is measured? Would it collapse to an energy eigenstate (a single excitation) corresponding to the result...

Asked on 08/28/2021

3 answer

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