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Physics : Recent Questions and Answers (Page 660)

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

Why do airplane wings have fins?

I was watching this video and it shows that adding fins on the wing helps the air get turbulent on the upper part of the wing, which...

Asked on 01/11/2021

2 answer

Confusion about potential energy, field energy, kinetic energy

I have some confusion about potential energy in Newtonian mechanics and field energy in classical Field mechanics. I have many questions but they are all strongly related. In Newtonian mechanics,...

Asked on 01/11/2021 by Juan Perez

2 answer

Microscopic surface charge distribution on a metal ball

On a metal ball with perfectly smooth surface with negative charge on it, the charge will be distributed evenly on the surface, but microscopically where exactly will the charge reside?...

Asked on 01/11/2021

0 answer

Why CBR and Comoving coordinates are not absolute reference frames?

Let us say that we know the Hubble parameter now. Why cannot Cosmic Background Radiation and/or the Comoving 3D frame be taken as absolute reference frames (at least far enough...

Asked on 01/11/2021 by Alchimista

1 answer

Do Legendre Transforms preserve the number of independent variables? Mathematical question about thermodynamics and natural variables/functions

The questions is to find a natural function of ${E, V,mu}$ in thermodynamics which is causing certain conceptual issues for me with the Legendre transform. The function that has...

Asked on 01/11/2021 by cheekylittleduck

1 answer

Time interval between two objects passing an intersection points

In linear motions, a collision occurs between two objects if$$p_1 + t_1v_1 = p_2 + t_2v_2$$where $p_1,p_2$ are two arbitrary position vectors and $t_1,t_2$ are...

Asked on 01/11/2021 by fhm

0 answer

Integral eigenvalues in compact rank-2 symmetric $U(1)$ gauge theory

I am reading a paper related to rank-2 symmetric $U(1)$ gauge theory:Fracton topological order from the Higgs and partial-confinement mechanisms of rank-two gauge theory (or...

Asked on 01/11/2021 by Waterfall

1 answer

Functionality of an Einzel lens

An Einzel lens is a device for ion optics to focus a beam of particles. It consists of three ring electrodes, with the outer ones being on...

Asked on 01/11/2021 by Octavius

1 answer

Gauge cosmic strings and large gauge transformations

I've been going around in circles (hah) about how gauged cosmic strings work (I've been using Preskill's notes for the most part). The global string scenario makes...

Asked on 01/11/2021 by quixot

0 answer

Cases where renormalisation isn't needed

In quantum field theory I've came across splitting up a Lagrangian (which has an interaction part) into renormalized parts with counterterms. Are there any lagrangians for which renormalisation is not...

Asked on 01/11/2021 by BJ boy

1 answer

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