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Physics : Recent Questions and Answers (Page 779)

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

Eddington-Weinberg relation

The numerical coincidence that triggered Dirac to postulate his Large Number Hypothesis can be summarized by expressing the proton-electron gravitational angular momentum in units $hbar c$: $$frac{G m_p m_e}{hbar c}...

Asked on 11/30/2020 by Johannes

2 answer

Accelerating Force on Slipping Tire

I'm wrestling with the problem of a car accelerating from rest whose engine is outputting a torque that would result in a force at the point of contact between the...

Asked on 11/30/2020 by Thomas Neumaier

0 answer

Is mechanical energy conserved in all Inertial frames? (Newtonian Mechanics)

Is total mechanical energy, i.e. Kinetic Energy + Potential Energy, conserved in a frame which is moving with constant velocity with respect to earth. Consider a ball dropped from a...

Asked on 11/30/2020 by AbsoluteZero

2 answer

Why does field strength follow the inverse square law but potential does not?

Either in a gravitational or electrical field, let's say an electrical field, the electrical field strength follows the inverse square law. This is fairly intuitive just due to the geometry...

Asked on 11/30/2020 by zacccczn

2 answer

What practical issues remain for the adoption of Thorium reactors?

From what I've read on thorium reactors, there's enormous benefit to them. Their fuel is abundant enough to power human civilization for centuries, their fission products are relatively short-lived,...

Asked on 11/30/2020 by GordonM

10 answer

Feynman diagram

I am having trouble understanding how the Feynman diagram represents the dielectric medium and its interference on the screen of the charge of the electron. The diagrams are as follow:...

Asked on 11/30/2020 by Gabriela Da Silva

0 answer

Derivation of $F=πBsin θ$?

I was searching for a formula for the magnetic force on a current-carrying conductor, and though I am accustomed to the formula $$F=IlBsin θ$$ where $I=$ current, ...

Asked on 11/30/2020 by T-bone

1 answer

What experiments show that special relativity is valid in the absence of gravity?

I know that observed phenonmenon like gravitational redshift, gravitational time dilation and bending of light rays tell us that special relativity is invalid in the presence of gravity. However, are...

Asked on 11/30/2020

2 answer

Jumping into a Pool While Wearing a Superhydrophobic Diving Suit.....What Happens?

I happened to chance upon this video on super-hydrophobic coating on youtube,https://www.youtube.com/watch?v=IPM8OR6W6WE I was wondering what'd happen if I managed to coat an entire full-body diving suit...

Asked on 11/30/2020 by user122395

2 answer

Scaling diffraction patterns (using FFT)

I am trying to write a program to compute the FFT of 1D complex aperture functions to determine diffraction patterns. Supposing I can produce the diffraction patterns successfully, I am...

Asked on 11/30/2020 by user3107693

1 answer

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