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Physics : Recent Questions and Answers (Page 805)

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

Jupiter-sized planet orbiting a white dwarf?

I read this news about a Jupiter sized planet orbiting a white dwarf. It is still puzzling to the scientists that how it remained as a ...

Asked on 11/03/2020

1 answer

Angular momentum of rotating and revolving body (earth)

My understanding is this: angular momentum of a body about a point cannot be in two directions at once, which is why a wheel already rotating about its axle, cannot...

Asked on 11/03/2020 by dnaik

2 answer

Is my understanding of how a force is applied through a string correct?

Let there be a situation where a force 'F' is acting on one end of an in extensible string which is connected to a box named 'A' resting on a...

Asked on 11/03/2020 by Aditya Bharadwaj

2 answer

Proof that product of fermion operators is bosonic

I have been told that two fermions make a boson, which I am trying to prove. Suppose we have two fermion annihilation operators $c_1$ and $c_2$ such that...

Asked on 11/03/2020

2 answer

Understanding Fock space

Let's start with a single particle Hilbert space $H$ with basis ${|alpharangle}$, where $alpha$ represents a complete set of quantum numbers. If we now take two particles...

Asked on 11/03/2020 by Mr. Mister

1 answer

Magnetic circuit: What is the cross section area I need to use?

I am struggling with this magnetic circuit.Magnetic circuit of a coil with moving part What is the equivalent cross section area I need to use to...

Asked on 11/02/2020 by user1022959

1 answer

Spin-helicity formalism for gluon-gluon amplitudes

In Schwarz's QFT he introduces in chapter 27 the Spin-Helicity formalism as a way of calculating gluon-gluon interactions much easier than going through all the Feynman calculus from the beginning...

Asked on 11/02/2020

1 answer

How does light, which is an electromagnetic wave, carry information?

We see an object when light from a source strikes the object and then reaches our eyes. How does light, which is an electromagnetic wave, gets encoded with the information...

Asked on 11/02/2020 by schizoid_man

11 answer

Doesn't relativistic mass increase mean increased energy released when matter is turned to energy?

If there were an interstellar spacecraft being propelled by gamma rays from electron/positron annihilation, they say it would get harder to keep accelerating it the closer it got to the...

Asked on 11/02/2020 by Robert Kirkman

2 answer

Does a Lagrangian being independent to a spacial coordinate imply spatial translation symmetry?

I’m trying to delve into lagrangian mechanics, mainly because i want to have a deeper understand of things lik Noether’s theorem. What i don’t fully understand is what the...

Asked on 11/02/2020

1 answer

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