# All Questions

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### What do negative times and negative distances represent in parametric projectile equations?

There are negative times and negative x and y distances in parametric equations; what do they represent? And is it possible to tell the object's speed, direction and acceleration from just a ...
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### Trying to make a realistic simulation of 'breaks' (Pool)

I'm working on a 2D pool simulation project right now, and I'm trying to create good looking physics that are also performant. After collisions are detected, I update the velocities of the balls. So ...
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### Aftermath of Plasma Arc

You have a chamber with constant amount of gas (say either helium or argon). You create the plasma with an arc and turn it off. How much of the gas used to create the plasma returns back to helium or ...
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### Metaphysics and spacial dimensions [on hold]

I'm a philosopher, not a physicist, I've done reading into a lot of disciplines, and have came to a theory that 'perception' (perception isn't such a good word 'cause it implies man) must be the first ...
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### Joint probability function for the values of a free field at two different points

For a free real field $\phi$ in its ground state, is there a way to find the probability distribution $p(\phi_x,\phi_y)$ for joint measurement of $\phi(x)$ and $\phi(y)$ at two spacelike-separated ...
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### Gaining symmetry through boundary conditions

Can Hamiltonian gain/lost some symmetry through boundary conditions? Initial expression may not have symmetry, but after specyfing boundary conditions and predicted form of the wavefunction it will ...
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### Is quantum indeterministic? [duplicate]

The question might look clear from a viewpoint of a non-physics guy but let me be more specific. Can we say quantum leaps or waves or maybe the universe itself are completely indeterministic or do ...
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### Photoelectric Effect - How are the electrons regained?

When the photons with enough energy impinge on a photocathode, it emits electrons. Does this mean that the solid will lose all its electron at one point? If not, how are electrons restored?
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### How to prove when electron spin is perpendicular to linear momentum, orbital angular momentum can't be 0 [duplicate]

And when they are paralleled, orbital angular momentum is 0.