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Physics : Recent Questions and Answers (Page 705)

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

How to calculate the resulting velocitys and rotation speed after two concave polygons collide in 2d

so I've been searching google for how to do this, but all anyone seems to care about is collision detection =p, and no results come close to teaching me how...

Asked on 12/27/2020 by Griffin

0 answer

Electric flux through a cube centered at the origin with a charge, $q$, centered at the origin

So the problem is a point charge is located at the origin of the coordinate system and a cube of side length 2a is centered at the origin and I...

Asked on 12/27/2020 by Hulk Remade

2 answer

Why does a right-circular cylinder helps reduce surface area of the former International Prototype of Kilograms

I read on Wikipedia that right-circular cylinder shape helps reduce surface area of the former IPK, but could not find an explanation as to...

Asked on 12/27/2020 by Sirou Ewei

1 answer

Why is this the Helmholtz Free Energy for the Onsager Ising Model?

I'm reading through Kerson Huang's presentation of the Onsager solution. We end up determining that the natural log of the partition function is $$ln Z = frac{1}{2}ln (frac{2 cosh^2(2...

Asked on 12/27/2020 by sjgandhi2312

1 answer

Quantum Mechanics Spectral decomposition misunderstanding

My notes state that the spectral decomposition formula is of the form: $$ hat{A} = hat{A}hat{1} = sum{hat{A} } |A_iranglelangle A_i | = sum{A_i } |A_iranglelangle A_i | ...

Asked on 12/26/2020

1 answer

Derivation of interaction potentials of fundamental forces

In Gauge theory of weak interactions by Greiner and Müller, they show the following superb comparison of the interaction potentials between particles as a function of separation: ...

Asked on 12/26/2020

1 answer

Motion in a straight line

Velocity and acceleration are directly proportional to each other but in the case of throwing a ball up , at the top velocity is zero but acceleration is there. why?...

Asked on 12/26/2020 by Angeline varghese

3 answer

Calculating the internal inductance of a long wire without the concept of flux linkage

I did read the following questions: "Flux linkage inside of a conductor", "Derivation of self-inductance of a long wire" and "Trouble understanding fractional flux linkage" The answers...

Asked on 12/26/2020 by Zalnd

1 answer

How does a capacitor get charged instantly in AC whereas it takes infinite time in DC?

I have seen when a capacitor is connected to a dc source it takes infinte time to charge, but when connected to ac it takes the potential of the source...

Asked on 12/26/2020

3 answer

Question about superconductivity

A long cylinder of radius $R$ is made from two different material. Its radius $r<r_0$$(r_0<R)$ part is a material with superconducting transition temperature $T_1$, and its $r_0<r<R$ part is...

Asked on 12/26/2020 by qfzklm

1 answer

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