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Physics : Recent Questions and Answers (Page 673)

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

Difference between momentum and kinetic energy

From a mathematical point of view it seems to be clear what's the difference between momentum and $mv$ and kinetic energy $frac{1}{2} m v^2$. Now my problem is the following:...

Asked on 01/06/2021

3 answer

How to get rotation components in each axis?

To explain what I mean let's say I have an object that is moving and I know its speed and direction (angle). I can get the X and Y components...

Asked on 01/06/2021

3 answer

The "Satellite Paradox": Twin paradox in orbiting satellites

I want to simply eliminate the effect of acceleration, which is the cornerstone in resolving the traditional twin paradox, through the following thought experiment: Assume twins $A$ & ...

Asked on 01/06/2021

6 answer

Changing length of spring

In this formula: $$F_s = kx$$ what is the force that influences on the length of the spring? For example I figured out if we pull up a mass...

Asked on 01/06/2021 by user283188

1 answer

Can this equation be used to find rotational inertia of spherical shell?

I just wanted to ask if this equation can be used when finding rotational inertia for the thin spherical shell. I am not sure if it is done the right...

Asked on 01/06/2021 by Kuke

0 answer

Comparison of books on the historical development of quantum mechanics

I am looking for a good book on the historical development of quantum mechanics. I have come across quite a few, but do not know which to read. I have...

Asked on 01/06/2021 by Mathew Mehrian

0 answer

How do you write a resolution of unity (the identity) in gauge theories?

In, say, a quantum field theory of a single scalar field $phi$, it is common to write the identity as ${bf 1}=int{cal D}phi, |phiranglelangle phi|$, a useful thing...

Asked on 01/06/2021

0 answer

Nielsen form of Lagrange equations

I came across the Nielsen form of Lagrange equations and I'd like to know what it's advantages are compared to the Lagrange equations, but I've been looking...

Asked on 01/06/2021 by dondi

0 answer

In atomic bomb tests under ground, where does the displaced volume of the rocks go?

Underground atomic bomb tests are done in a deep, sealed hole. Not all underground tests eject material on the surface. In this case, they are only noticeable as earthquakes,...

Asked on 01/06/2021 by Volker Siegel

2 answer

Einstein wanted to omit the unnatural second term on the right-hand side

I was reading the following topic on Wikipedia but couldn't understand few points: https://en.wikipedia.org/wiki/Mass–energy_equivalence#Mass–velocity_relationship. I'd appreciate it if you could keep the answer simple. I have highlighted...

Asked on 01/06/2021 by PG1995

1 answer

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