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Physics : Recent Questions and Answers (Page 167)

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

Does energy of a capacitor means energy stored in both plates?

I've a doubt in this, Does the term potential energy of a parallel plate capacitor means the energy stored in both the plates or a single plate, since the formula...

Asked on 07/23/2021 by Bunny pink

2 answer

Canonical ensemble in many-body quantum mechanics

Suppose I have a many-body system with creation/annihilation operators $hat{c}^dagger_n$, $hat{c}_n$, and Hamiltonian:$$hat{H}=sum_n E_n hat{c}^dagger_nhat{c}_n$$If I wanted to write down the density matrix for a...

Asked on 07/23/2021 by user502382

1 answer

Justification for "reducing integrals" in the virial expansion for gases

I have been following this document (https://sites.chem.utoronto.ca/chemistry/jmschofi/chm427/gases.pdf) regarding the virial expansion of gases and on finding the virial coefficients. On Page 7, they do the following:...

Asked on 07/23/2021

1 answer

Why does the Gibbs free energy not decrease ad infinitum?

I would like to ask which guarantees if the Gibbs free energy has a minimum in closed system (e.g. in a chemical reaction system) at constant pressure and temperature? Why...

Asked on 07/23/2021

2 answer

Huygens principle and path integral for classical waves

I want to better understand what the path integral is and what it isn't.Even though I do this to learn QFT, this question is purely concerned with classical fields,...

Asked on 07/23/2021 by akreuzkamp

0 answer

Understanding Lorentz transformation

The time part of Lorentz transformation is given by, $$t'=gammaleft(t-frac{vx}{c^2}right)$$ I am having trouble in understanding this formula. Suppose that $t=t'=0$ the formula above tell us that ...

Asked on 07/23/2021

3 answer

Galaxy statistics calculation in Saslaw's book

I am trying to follow a calculation from the book of William C. Saslaw, The Distribution of the Galaxies: Gravitational Clustering in Cosmology. The calculation is shown on the pages...

Asked on 07/23/2021 by Shaz

0 answer

Can I shorten the resonant length of a tight wire by moving its endpoint in phase?

A stretched string, tube or wireless antenna has a resonance fixed by the velocity of the wave (sound in air, metal, electrical wave etc.) and the length of the...

Asked on 07/23/2021 by artag

3 answer

How fast can an object be made to vibrate?

Can an object (or system) be made to vibrate so fast, that the vibrational transit speed approaches the speed of light therefor slowing time down significantly for the object or...

Asked on 07/23/2021 by Larry

0 answer

Why do the two plates of a capacitor store equal amounts of charge?

I understand that this happens due to Kirchhoff's law. Any current entering one side of the capacitor must have come from another part of the circuit connected to the other...

Asked on 07/22/2021

2 answer

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