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HNQ
12:34 AM
3
Q: Does the energy flow during interference violate the existence of speed limit?

AnkitI was recently told by my physics teacher that when two waves interfere then the energy lost in the destructive region is transferred to the constructive region and hence no violation of conservation of energy. Now the speed of EM waves is the speed limit of the universe. Keeping this in mind , w...

 
 
2 hours later…
HNQ
2:15 AM
2
Q: The location of the exact center of the observable universe

CalebIf simultaneously in every direction, I were to precisely measure the distance to the edge of the observable universe (not: the physical universe), then would I find myself exactly in the center with zero error tolerance? Would it make a difference if I were accelerated in relation to some point ...

 
 
4 hours later…
HNQ
6:02 AM
1
Q: How does potential energy increase with no work?

JohnIf you're dragging an object up a hill at a constant velocity, work is technically 0 (as acceleration is 0), but potential energy constantly increases. How would you represent this situation mathematically, and how does the potential energy increase despite a lack of work?

 
 
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HNQ
9:49 AM
1
Q: How do laws of physics prohibit direct conversion of particles to antiparticles?

GreendrakeCan antiparticles only be created in pair production? How/which laws of physics prohibit direct conversion of say an electron to a positron? A neutron to an antineutron? I have seen a comment that it is thermodynamically impossible. True? How exactly? Any other ways it is theoretically impossible?

 
 
3 hours later…
HNQ
1:10 PM
2
Q: Does the mechanical energy of a system depend on the condition of the inertial frame?

user113581321The question arose because of the following situation: Two cars with the same mass are side by side on the same track with speed $v_1$ in the same direction. Suddenly, a third car, also with the same mass, comes in the opposite direction with speed $v_2$ and collides head-on with one of the cars....

 
 
4 hours later…
HNQ
4:59 PM
1
Q: What does spectral flux density mean "per wavelength"?

Andrew TomazosIf I understand correctly the term "spectral flux density" describes radiant flux for a given wavelength, right? Like the given wavelength is the $\nu$ in: $$F(\mathbf{x},t;\nu)=\oint_\Omega I(\mathbf{x},t;\hat{\mathbf{n}},\nu)\hat{\mathbf{n}}\,d\omega(\hat{\mathbf{n}})$$ For example, the EM wave...

 
 
4 hours later…
HNQ
8:45 PM
3
Q: Are paired electrons not bosonic?

Struggling_StudentA pair of electrons has spin 0 which makes any such system a boson rather than a fermion. The Pauli exclusion principle does not apply therefore to paired electrons and any such two electrons can coexist in the same quantum state. Wouldn't it make electron shells collapse all into the lowest 1s²?...

 
HNQ
9:36 PM
1
Q: How do you calculate the moment of inertia of a 3 quarters full cylinder?

DSONSDIf the cylinder's cross-section is as followed: Assuming that the bottom part of the cylinder is filled because it is filled with water. What would be the moment of inertia about the center of the circle? (Assume that the cylindrical case that contains the water has no mass).

 

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