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Physics : Recent Questions and Answers (Page 750)

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

Flying a drone in a moving car/airplane

Why does a drone fly with respect to the air in a moving car/airplane, but not in an elevator as shown in this clip: What Happens If You...

Asked on 12/11/2020

7 answer

Quantum-Classical Hybrid theories: How useful are they?

I have seen several attempts at building a consistent quantum-classical theory, i.e., a theory where a quantum (sub) system interacts with a classical one somehow.Examples: (1) ...

Asked on 12/11/2020

0 answer

Where is expressed the distance between particles for the formula of cross-section in an accelerator?

Let's consider the so-called Master formula, which expresses the cross-section of interaction between two protons, taking into account the parton density function and the intrinsic cross-sections between two partons, for...

Asked on 12/11/2020

1 answer

Why is maximal kinetic energy lost in a perfectly inelastic collision?

A perfectly inelastic collision is one where both of the colliding objects stick together and move as one. My questions is, why, of all possible combinations of final velocities that...

Asked on 12/11/2020

7 answer

Why we cannot integrate out the light field/modes in effective field theory?

generally we integrate out the heavy field/modes in effective field theory, however, I'm wondering why couldn't we integrate out the light field/modes instead. Actually i think it's reasonable from mathematics....

Asked on 12/11/2020 by feng lin

3 answer

Why doesn't planet Earth expand if I accelerate upwards when standing on its surface?

According to General Relativity I am being accelerated upwards by planet earth while writing this question. But a curious person on the the other side of the planet relative to...

Asked on 12/11/2020 by Megahyttel

7 answer

On the magnetic field in the Meissner effect

As shown in the figure, in the Meisner effect, the magnetic field of the magnet bypasses the superconductor. My question is, does the magnetic B field belonging to the magnet...

Asked on 12/11/2020 by dan li

1 answer

Can I increase cooling efficiency with evaporative cooling?

I had an idea recently. But I don't have the physics knowledge to know if it makes sense or not. I've become a bit of a PC enthusiast lately and...

Asked on 12/11/2020 by tyler mackenzie

2 answer

Right after the Big Bang, how did particles overcome extreme gravity and other forces and manage to fly apart?

I have read this question: Why did the universe not collapse to a black hole shortly after the big bang? where Lubos Motl says:This matter has no center -...

Asked on 12/11/2020

2 answer

How do I know which observer is running the time faster or slower?

Ok, I'm not a physicist, so I don't know if my question is silly (probably yes), but there is something in special relativity that I can't understand and I would...

Asked on 12/10/2020 by Richard Gold

5 answer

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