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Apr
10
comment Why is it necessary to enrich Uranium and Plutonium before they can be used in nuclear warheads?
Very closely related: Why does it take so long to make a nuclear bomb?
Apr
9
comment Power lines and cars
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Apr
9
comment Planes of Simultaneity on Minkowski diagrams
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Apr
9
comment Membrane Theory
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Apr
9
revised Methods for handling close approaches in $N$-body simulations
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Apr
9
comment Question about aircraft/rockets
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Apr
9
comment Why can't I use conservation of energy to find ratio of final velocities on different planets?
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Apr
9
comment Effect of Coriolis force
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Apr
5
comment Can someone help me to do the math?
You're asking for a large chunk of the mathematics in all of physics. That will take at least an entire bookshelf. This is the sort of thing that takes years of study to learn, and not just casual study but rather study to the exclusion of most everything else.
Apr
5
comment Is there a way of detecting nearby type 1a supernovas?
@hsnee The light in a core-collapse supernova takes a few hours to diffuse out of the star from the imploding core, whereas the neutrinos take just a few seconds.
Apr
5
comment Is there a way of detecting nearby type 1a supernovas?
(I don't remember off hand what the neutrino vs. light delay would be. It's possible that the smallness of the progenitor means you wouldn't have much warning anyway.)
Apr
5
answered Is there a way of detecting nearby type 1a supernovas?
Apr
3
reviewed Leave Open Quantum mechanics of the electron in an atom vs. Gryzinski's free-fall atomic model
Apr
3
reviewed Close How is hemispherical shell any different from a semi-disc in terms of center of mass?
Apr
3
reviewed Leave Open Is the question: 'Is our universe the inside of a black hole?' meaningful?
Apr
3
comment Stacked motors thought experiment
What exactly is a grinder? I feel like there's a better word.
Apr
1
reviewed Approve What determines the sharpness of a shadow?
Mar
31
reviewed Close How to visualize gravity fields?
Mar
31
reviewed Leave Open Boundary Conditions For Strings?
Mar
31
comment Boundary Conditions For Strings?
@ACuriousMind I'm going to go out on a limb here and assume the "string theory" in this question is about a literal piece of string.