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Physics : Recent Questions and Answers (Page 124)

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

Can we use Heisenberg Uncertainty Principle to prove that time travel to past is impossible?

Suppose the case that someone in future makes a time machine which can be used to time travel in past. Now s/he can accurately measure momentum of a particle without...

Asked on 08/09/2021 by 1147

5 answer

Are humans special in that they collapse wave functions?

First of all, I don't really believe that humans are special. So I know the answer must be that they are not. But the way quantum mechanics is described is...

Asked on 08/09/2021

2 answer

Alternator rotate in reversed direction: does the induce emf violate the Lenz's law?

There is a question in my textbook: Below show the structure of a bicycle alternator: And the output terminal is...

Asked on 08/09/2021 by yuan lai

0 answer

Why darmstadtium has more than one eletronic configuration? (Aufbau Principle)

Darmstadtium aparently has two possible eletronic configuration via Aufbau Principle: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹ 5f¹⁴ 6d⁹ but for...

Asked on 08/09/2021

0 answer

Tension vs Tensile Strength

A Brief Explanation of the Issue A common problem type for vector calculus students or introductory physics/engineering students is tension problems. For instance, if a mass of $10$ kg...

Asked on 08/09/2021 by mathematics2x2life

3 answer

Proof of the Saint-Venant compatibility equations

In the Mechanics of deformable solids, and specifically in the Theory of Elasticity, the following mathematical relation is known: $$ 2 cdot frac{partial^2 epsilon_{12}}{partial x_{1} partial x_{2}} = frac{partial^2...

Asked on 08/09/2021 by Programar

1 answer

Elvang and Huang sign error? Polarization Vectors in the Spinor Helicity Formalism

I am reading through Elvang and Huang's treatment of polarization vectors for all outgoing spin-1 massless particles (metric signature $(-,+,+,+)$). It is given in Eq. (2.50)...

Asked on 08/09/2021

0 answer

Why do physicists like to put the imaginary unit $:i=sqrt{-1}:$ everywhere?

There are many disagreements of convention between mathematicians and physicists, but a recurring theme seems to be that physicists tend to insert unnecessary factors of $i = sqrt{-1}$ into...

Asked on 08/09/2021

2 answer

Component of the velocity gradient part of Vlasov equation in cylindrical coordinate

I am stuck with a problem in expanding the velocity gradient part of the Vlasov equation in cylindrical basis. It is also applicable to the spatial gradient part as well....

Asked on 08/09/2021 by Sayan Kundu

0 answer

How to use gyroscope to detect rotational reference frame?

Books often says that we can use gyroscope to see if we are in a rotational reference frame.I would like to know how do we use it and...

Asked on 08/09/2021

0 answer

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