Newest Questions

Reading Schutz's book on GR: https://www.if.ufrgs.br/oei/santiago/fis02012/FirstCourseGR.pdf On page 9, there's a derivation (reproduced in the picture below) that I don't follow. If all the barred ...

I am currently reflecting a bit on the formal structure of the theory presented in Callen's classic text Thermodynamics and an Introduction to Thermostatistics. I was originally going to post a more ...

I'm having trouble understanding how two entangled particles stay correlated once they are measured. As an example, if they are anti-correlated in their spins, and one particle is measured to have a ...

A 1380-kg block of granite is dragged up an incline at a constant speed of 1.34 m/s by a steam winch (Fig. 11-32). The coefficient of kinetic friction between the block and the incline is 0.41. How ...

Consider Compton scattering $$p_1 + p_2 \to p_3 + p_4$$ in the laboratory frame. According to Quantum Field Theory and the Standard Model by Schwartz, the relation between the differential cross ...

In standard electrodynamics $$\mathbf{E}=\mathbf{E}_\parallel+\mathbf{E}_\perp$$ $$ \begin{eqnarray} \mathbf{E}_\parallel&=&\frac{1}{4\pi}\int\frac{\rho}{\varepsilon_0}\frac{\hat{\mathbf{r}}}{...

In the proofs for the value of angle of Deviation , it's written that ' the net angle of Deviation is the sum of the deviations at the two interfaces ' and proceed to calculate angle of Deviation , ...

I have a few questions about principle how van de Graaff generator works. To avoid confusion I will use numbering from the wiki picture: It seems to involve following key steps which I would like to ...

I am trying to figure out following statement: For noble metals, the free-electron picture would predict that the Fermi sphere does not reach the boundary of the first Brillouin zone. In reality, ...

Im a 7th grader so I'm not good in physics that much, but I'm just a curious boy which wants to become a cosmologist.Can the amount of energy or particles run out? For example pizza dough can be ...

How do we see the observable universe? We can't use a normal telescope to see the whole observable universe obviously. So which technology helps us see the observable universe? Im a 7th grader so ...

Im an 7th grader so I request everyone who are answering this question please give answer in simple words. A electron is spin up and the other electron is spin down then suddenly how does the electron ...

We say that magnetic flux density is number of magnetic flux lines per unit area. But are there actually an finite amount of lines passing through an area, I think that the answer is no, but then what ...

I have been reading Schollwöck's review on Matrix Product states, and I understand the general principle and motivation behind them. However I cannot wrap my head around the construction of the ...

Let's say we describe an unstable particle using perturbation theory. Then we have a non-zero decay width, which we say $\Gamma$. Now, if we define mass to be the pole of the propagator, we get $$ \mu^...