I 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...

If 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 ...

If 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?

Can 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?

The 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....

If 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...

A 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?...