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Physics : Recent Questions and Answers (Page 768)

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

Superconductor ring with persistent current

I have a question about the mechanism that induces permanent current in a superconductor ring. I'm refering to explanations from this source https://www.wiley-vch.de/books/sample/3527403493_c01.pdf on page 12. Background:...

Asked on 12/04/2020 by katalaveino

3 answer

2D ising model explains phase transition (Para-ferro) in 3D space How?

2D ising model explains phase transition (Para-ferro). How come a 2-D model explain a system where spins are distributed in all three directions?...

Asked on 12/04/2020 by Neeraj kumar

1 answer

Shape of molecular bonds

I'd like to model some simple molecules using VSEPR. With what functions should I approximate the sigma and pi bond orbitals?A simple Gauss would do it?I'd like to...

Asked on 12/04/2020 by RobertSzili

0 answer

Why do dental drills need such high rpm?

Dental drills have always been cutting edge technology when it comes to high rotational speeds. According to Wikipedia modern drills reach more...

Asked on 12/04/2020 by A. P.

1 answer

Special Relativity in water

If there are 2 observers in water moving relative to each other as well as to water, they measure different speeds of light. So does time dilation occur for...

Asked on 12/04/2020 by Siddhant Sharma

2 answer

How much energy from the Sun could we get if we use Jupiter as a gravitational or atmospheric lens?

How much energy (watts) from sunlight could arrive to the focal point if we use Jupiter as a gravitational lens? and if we use it as an atmospheric lens by...

Asked on 12/04/2020

1 answer

Rigid body motion decomposition

A rigid body motion can be decomposed into translation and rotation. My question is, given a rigid body motion velocities of all points in the body, how to decompose this...

Asked on 12/04/2020 by user138668

2 answer

Do cosmological event horizon evaporates like black-hole horizon?

While the inflation phase of the universe, expansion was exponential and so the universe was de Sitter-like. So, for a point-like observer, there was a cosmological event horizon. Do this...

Asked on 12/04/2020

0 answer

Hamiltonian density from Klein-Gordon field

In the solution for Peskin & Shroeder 2.2 where the Hamiltonian density obtained from the Klein-Gordon Lagrangian is given by:$$ H = pi^* pi + nabla phi...

Asked on 12/04/2020 by David Feng

1 answer

Question about the Dirac notation for partial trace

I saw the following definition for the partial trace operator:$rho_A=sum_k langle e_k|rho_{AB}|e_krangle$, where $e_k$ is basis for the state space of system $B$.From what I know, in the Dirac notation,...

Asked on 12/04/2020

3 answer

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