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Physics : Recent Questions and Answers (Page 103)

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

What happens, electromagneticaly, when you push something?

Scenario : I understand that if I push a boulder the mechanical structure of my body is being used. Cells, molecules, atoms and ultimately the electromagnetic force of my...

Asked on 08/18/2021 by nialloc

2 answer

Weird projectile motion question

The question is as follows:A ball is thrown from a point $O$ towards a vertical wall in such a way that, after rebounding from the wall, it returns to...

Asked on 08/18/2021

2 answer

Can a balloon and wool be seen as two terminals of a battery?

From what I understand, a battery produces potential difference across its two terminals. It does that by producing an accumulation of charges (positive charge in the positive terminal, negative in...

Asked on 08/18/2021 by YoavKlein

1 answer

Inertia tensor formula for point masses in rigid assembly?

Suppose I have $N$ 1kg point masses in a massless rigid assembly such that the center of mass of the assembly is at the origin and point mass i...

Asked on 08/18/2021

1 answer

Sum of all two point correlation functions in the Ising model

The two point correlation function for the Ising model is defined as $left[langlesigma_isigma_jrangle -langlesigma_iranglelanglesigma_jrangleright]$. Then the sum over $i$ $j$ of that function gives:begin{equation}...

Asked on 08/18/2021

1 answer

Is there a laser in which based on Ytterbium

I understand that Ytterbium can emit a photon with a relatively high and very accurate frequency (narrow band of frequency). I also know that Ytterbium is being used to verify...

Asked on 08/18/2021 by Ofer

0 answer

Demystifying time-reversal symmetry in physics

Briefly, which physical theories are expected to be time reversal invariant? That is, the mapping of $tto -t$ will not alter the physics. Even in Classical Mechanics (CM) it is...

Asked on 08/18/2021

3 answer

Expansion coefficient for an ideal gas at constant pressure is $α = 1/Τ$. Explain this relation

How the coefficient of expansion for an ideal gas is given by $α=1/Τ$, (at constant pressure). How could it be inversely proportional to it. Doesn't gas expand more on...

Asked on 08/18/2021 by Samyak Marathe

1 answer

Proposed dark matter mass limits

A recent paper (arXiv version also available) proposes to derive dark matter mass ranges of $10^{-3} sim 10^{7} eV$ for a singlet scalar,...

Asked on 08/18/2021 by alexchandel

0 answer

Is the duration of atomic/electron phenomena proportional to the wavelength of photons produced by those phenomena?

Given that any periodic electromagnetic emission has a wavelength due to its time related oscillation and a finite speed of propagation, is it the same for atomic/electron phenomena, such as...

Asked on 08/18/2021

1 answer

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