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Physics : Recent Questions and Answers (Page 811)

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

Can we use equation of motion for a mass that has changed?

There is a mass A attached to a horizontal spring fixed at an end. An equal mass B comes along and hits the mass with velocity $v$. Can I...

Asked on 10/19/2020 by Bikash Adhikari

2 answer

Fringing of electric field

I have read that in a capacitor with charged parallel plates the electric field lines are parallel in the middle, but they tend to bend outwards (causing a "fringe") towards...

Asked on 10/19/2020 by Abhinav Tahlani

2 answer

Assumption of local thermodynamic equilibrium in fluid dynamics

Moving fluids are generally in a state of non-equilibrium. However, in fluid dynamics, people generally assume a state of local thermodynamic equilibrium and argue that in such a condition, equilibrium...

Asked on 10/19/2020 by Shivam Sinha

2 answer

Why is Stephenson 2-18 so large?

How does a star as large as Stephenson 2-18 get this big? It is 2500 times larger than the sun. Did it start out as a large star with...

Asked on 10/19/2020

1 answer

Lorentz algebra structure in Hilbert space vs Vector space representation "must have the same commutation relations"

I'm following the Srednicki book, Ch. 2 The definitions are: Small Lorentz transformation on Minkowski space, so $S^{mu nu}$ forms the vector representation of the Lorentz group$$...

Asked on 10/18/2020 by user16320

0 answer

Expansion in flat spacetime

I have been studying Raychaudhuri equation and focusing theorem related to it. Focusing theorem says that if the strong energy condition is satisfied and rotation tensor vanishes $omega_{ab}$=0 then...

Asked on 10/18/2020

1 answer

Element well in periodic table

It may be a very stupid question, but still. Given a periodic table Why there is a well/hole of missing...

Asked on 10/18/2020 by Agnius Vasiliauskas

1 answer

Quantum computing applications

What are some of the known/ongoing quantum computing applications that we will see as the earliest applications in a business setup?...

Asked on 10/18/2020 by Vikas Pandey

1 answer

Quasiconcavity of the Variance of the Gibbs Measure

Pardon me for taking some time to set up my notation as I do not come from a physics background and am not using the standard statistical mechanics notation. Consider...

Asked on 10/18/2020 by user3338852

0 answer

Feynman rules for interactions with derivatives: How exactly do the momentum factors appear?

I know how to treat Feynman interactions without derivatives by Wick contraction. But now, take for example $$mathcal{L}_{int}=lambda phi (partial_{mu}phi)(partial^{mu}phi).$$ Now many books write that in momentum space the...

Asked on 10/17/2020 by korni1990

1 answer

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