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Physics : Recent Questions and Answers (Page 678)

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

Validity and limitations of the equipartition theorem

The Classical equipartition theorem can be resumed by the following statementIn equilibrium, nature seeks the equipartition of energy, in which each degree of freedom contains an average amount of energy...

Asked on 01/05/2021 by Cristian Rodríguez

0 answer

Why is $PT$ transformation not observable?

In the Preskill's notes, QFT 1 page 70, he said:Unlike charge conjugation $U_C$ and parity $U_P$, $U_{PT}$ is not an observable. For examplebegin{align}U_{PT},e^{itheta}...

Asked on 01/05/2021

0 answer

How do microwave kilns work?

I have recently been doing some research into the working principle of a microwave kiln, and have run into a few things that continue to confound me....

Asked on 01/05/2021 by CJL

1 answer

If 1 kg of mass is converted to energy and used to accelerate a second 1 kg mass, what would be the final velocity?

A bit rusty, tried using $E=mc^2$ to figure out how much kinetic energy would 1kg of mass convert to, and then work backwards to figure out what would be the...

Asked on 01/05/2021

1 answer

Definition of Buoyancy Flux

I've seen in some papers the definition of buoyancy flux as follows $$B = g frac{rho_a-rho_0}{rho_0}Q$$ where $g$ is the gravity acceleration, $rho_a$ is the density of the ambient fluid,...

Asked on 01/05/2021

2 answer

Where does the heat from friction come from?

If I drag an object across a surface and a force due to friction acts on the object which is equal and opposite to the force I apply, the net...

Asked on 01/05/2021 by Matt0410

2 answer

Can we talk about velocity field and acceleration field in 1D?

It's well know that a charged particle radiate when it is accelerated. We can rely on two different formulas. The first one it's from Jefimenkos : $$mathbf{E}(mathbf{r}, t) =...

Asked on 01/04/2021 by WilliamFr

1 answer

What is the relationship between the different aspects of mass?

There seem to be several different ways in which mass manifests itself, in particular with reference to fundamental particles:Gravitational mass.Inertial mass.The coupling to the Higgs field.The energy and lifetime of...

Asked on 01/04/2021

1 answer

Project Euclidian tensor of fourth order onto subspace of Hooke's tensors

For a given Euclidian tensor of fourth order in three dimensions $mathbf{A}$, how does one compute the Hooke's part $mathbf{H}$ of $mathbf{A}$? With the space of Hooke's...

Asked on 01/04/2021 by JulianBauer

1 answer

Do electrons interact attractively?

I read that electrons could interact attractively in superconductors and form Cooper pairs. This attraction is due to the electron–phonon interaction, with the phonon being the collective motion of...

Asked on 01/04/2021

0 answer

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