Newest Questions

Let $$M = \mathbb{R}^2 \setminus D$$ where $D$ is a closed disk. On $M$ we take the flat Euclidean metric, and we impose specular reflection on $\partial D$: test particles move at constant speed ...

A system made of an even number of fermions behaves like a boson in terms of quantum statistics. One example for that would be the hydrogen atom consisting of one proton (spin-1/2) and one electron (...

I'm trying to publish this paper about a Quantum Gravity using the atomic nucleus, but by now the answer is it's controversial. What do you think? https://www.researchgate.net/publication/...

Air with density ρ, absolute pressure P1 flows through a pipe with velocity v₁ and cross-sectional area A₁, and then enters a contraction with area A₂. A1/A2=10. We need to determine the pressure P₂ ...

A student attempts to study a temperature of absolute zero by using a constant volume gas thermometer. According to his experience the pressure of triple point of water was 4.0010⁴ N/M² and the normal ...

1.With neat sketch, explain the Joules’ experiment 2.What are the drawbacks of first law of thermodynamics

My son is practicing with his high school Science Olympiad team and came across this question: His source includes an answer, without explanation, that the coefficient of friction is $\mu\approx3.3$. ...

In the book of sakurai Modern Quantum Mechanics they have this $$ \begin{aligned} & \sqrt{(j \mp m)(j \pm m+1)}\left\langle j_1 j_2 ; m_1 m_2 \mid j_1 j_2 ; j, m \pm 1\right\rangle \\ & =\sqrt{...

https://nov79.com/en/mmor.pdf https://www.researchgate.net/publication/266497145_Observation_of_a_Non-conventional_Influence_of_Earth'...

I recently studied electron spin and magnetic fields. But I'm unable to understand how the magnetic field arises from this spin All answer I have gotten are that this is a property of electrons But I ...

If we have longitudinal waves in the string of a tin can telephone, why they depend on the tension of the string. Please send any material for deep research

The gravitational constant G has been measured in various experiments since Cavendish, but nearly all assume that macroscopic bodies (like test masses or the Earth) act as uniform sources of gravity. ...

What is the relativistic equation capturing the equation of motion of an electron going through the Stern-Gerlach experiment in classical mechanics? After some googling it seems I'm after a derivation ...

It seems this has been discussed here previously (e.g this and this post), but I still feel uneasy. Essentially, I think it all boils down to the popular interpretation of the scalar field operator in ...

The Pauli repulsion and Bose--Einstein condensation (BEC) arise from quantum statistics and are currently not considered fundamental forces. However, they are neither gravitational nor electrostatic ...