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Nov
27
comment Why does rotation simulate gravity if motion is relative?
That statement is controversial. What's preventing me from saying the universe is revolving around me?
Nov
23
revised Is charge transfer from A to B positive or negative?
clarified question
Nov
23
suggested approved edit on Is charge transfer from A to B positive or negative?
Oct
21
comment Is my interpretation of how a gravitational wave is formed correct?
That's cool! What are the 10 potentials? I don't really know much physics (only introductory undergraduate physics) so if there are any analogies to classical mechanics or E/M that'd be really useful. (Say, are they like the magnetic vector potential? Or like the electric or gravitational scalar potential in classical physics?)
Oct
10
comment In which direction does a wall exert the reaction force if it is hit diagonally?
@BenCrowell: What do you mean gravity is negligible? It doesn't seem very negligible to me.
Oct
8
comment How does an object's motion behave if dropped from an aeroplane travelling diagonally upwards?
@dmckee: er, you can call it whatever you want, I just thought it was worth saying, is all.
Oct
7
comment How does an object's motion behave if dropped from an aeroplane travelling diagonally upwards?
@Kyle: I mentioned it because it's a common misconception that I felt people on this page had fallen for and was worth clearing up, not because I thought it was "more of a caveat" than air drag in some way.
Oct
7
comment How does an object's motion behave if dropped from an aeroplane travelling diagonally upwards?
@ACuriousMind: How is this not an answer? The question is what the shape would be and I clearly say that it's an ellipse...
Oct
7
answered How does an object's motion behave if dropped from an aeroplane travelling diagonally upwards?
Oct
7
comment How does an object's motion behave if dropped from an aeroplane travelling diagonally upwards?
Note that the angle is redundant, the velocity already specifies the angle.
Sep
18
awarded  Famous Question
Sep
8
awarded  Curious
Sep
7
asked (Why) is dumping liquid nitrogen on your head dangerous?
Aug
24
comment Aharonov–Bohm effect on a non-contractible manifold
$\mathbf{B}$ is "magnetic flux density", not "magnetic potential"...
Aug
23
answered Forces as vectors in Newtonian mechanics
Aug
22
comment Presence of planets in Milky Way and other galaxies
I never understood the fascination with existence of planets outside the solar system. Isn't it common sense that any matter that doesn't turn into a star will turn into something else? And clearly if it's large enough it'd be a planet...
Aug
14
comment Why does a star beyond a certain mass limit (Chandrasekhar limit) only become a black hole?
So that means all the iron on Earth came from supernova event(s) from a star with mass $M_\star\gtrsim 8M_\odot$, right?
Aug
11
comment Is 'amp' a technically invalid term?
I feel it's a science vs. engineering thing?
Aug
6
comment When a planet has a high gravity, is it impossible to build and launch a successful chemical rocket to space?
True, good point!
Aug
6
comment When a planet has a high gravity, is it impossible to build and launch a successful chemical rocket to space?
I haven't really tried to work it out, but does this take into account that the mass must come from within the planet itself?