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Physics : Recent Questions and Answers (Page 55)

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

Question about an equation of kinematics derived with Lagrangian Mechanics

In this video https://youtu.be/2o3-GTk72x8, Professor Michel Biezen derives the following equation : $$mx’’+mell left(theta’’ cos(theta)-sin(theta)(theta’)^2right) = -kx. $$ However, the terms inside the bracket are not...

Asked on 09/30/2021

2 answer

Gauge fixing, invertibility and Green's functional

consider the photon in QED and the corresponding EOM of its Green's functional in k-space: $$(k^mu k^nu-k^2g^{munu})Delta_{nurho}(k)=idelta^mu_rho.$$ Now, I understand that $U^{munu}(k):=k^mu k^nu-k^2g^{munu}$ is not injective, since ...

Asked on 09/30/2021

2 answer

Enthalpy of vaporization of water and specific heat of water differences

So I am doing a lot of research on evaporative coolers and I have come to a question I can't find much info on. I am currently a mechatronics engineering...

Asked on 09/30/2021 by Thermr

1 answer

Solving Schrodinger equation in rectangular coordinates for triatomic reactions

I want to simulate triatomic reactions without going to spherical/hyperspherical system. I need some resources such as books or papers where the theory of triatomic reactions is given in rectangular...

Asked on 09/30/2021

0 answer

Dealing with the electrostatic boundary condition

In Griffiths, it is noted that there is a discontinuity in the electric field for a material with a surface charge density. ...

Asked on 09/30/2021

1 answer

Kerr Metric in Cartesian Coordinates

I have checked online and the Kerr metric never seems to be given in Cartesian coordinates (although there is a conversion factor from Cartesian to Boyer-Lindquist coordinates). Is there...

Asked on 09/30/2021

1 answer

Centripetal force for a rotor or centrifugal force?

From basic physics any object experiencing a uniform circular motion, experiences a centripetal force. However in electric machines at high speed the rotor would be deformed outward as if a...

Asked on 09/30/2021

1 answer

Horizontal Gauge Symmetry?

Some physics literature says Horizontal Symmetry of gauge theory, such as this paper, available also at arXiv. What does this Horizontal Symmetry of gauge...

Asked on 09/30/2021

1 answer

Calculating magnetic strength required to hold an objects weight + wind speed?

Note: I'm a bit new to this subject, so I'm looking for some general answers, ballparks, and direction to continue my research. Scenario: I have three electromagnets capable of X...

Asked on 09/30/2021 by Matt Kenefick

1 answer

Do gravitational waves bounce the space upwards?

I will try my best to explain. When I think about waves, I generally tend to first visualize a stable and flat two-dimensional surface, in position 0. When a normal...

Asked on 09/30/2021

0 answer

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