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location Buenos Aires, Argentina
age 22
visits member for 3 years, 7 months
seen 1 hour ago

1d
revised Rotating a stone with a string
rolled back to a previous revision
1d
revised What about negative Pressure?
rolled back to a previous revision
1d
revised Inserting metal into parallel plate capacitor
rolled back to a previous revision
1d
revised Charge inside conductor
rolled back to a previous revision
1d
revised Faraday's law - does the induced current's magnetic field affect the change in flux?
rolled back to a previous revision
2d
reviewed Edit Do shadows have mass?
2d
revised Do shadows have mass?
Grammatical correction only
2d
comment Books on quantum mechanics with intuition
It is my humble opinion that pretty much the only way to develop intuition in QM (if there even is such a thing) is by practicing the math.
2d
comment Is the speed of sound almost as high as the speed of light in neutron stars?
Pretty sure the question is just asking about the speed of sound, using the regular speed of light ($3\times 10^8 m/s$) as a reference speed.
2d
comment Why doesn't Beta Decay violate the laws of physics?
@Deep: They are not defined, they are measured. The proton's mass is measured to be $938.2\ \text{MeV}/c^2$, while the neutron's mass is $939.5\ \text{MeV}/c^2$. They are different particles, so there is no a priori reason why they should have the same mass.
May
20
revised Relativity question about 4-velocity
edited title
May
19
answered Do we weigh more when standing near massive buildings?
May
16
answered Laplace-Beltrami vs d'Alembert operators in flat vs curved space-time
May
10
comment Calculating Christoffel symbols from Lagrangian
@SpacemanSpiff Remember that in my formula there's a sum over $\nu$ and $\rho$, that's why there are $\dot{\theta}^2$ and $\dot{\phi}^2$ terms.
May
10
answered Calculating Christoffel symbols from Lagrangian
May
9
comment Dodging paintballs
Your acceleration is taken from a person running, which I'm not sure is relevant here. For example, I can make my arm go from $0$ to very fast much faster than even Usain Bolt could accelerate, because it's a different kind of motion. To dodge the paintball you don't need to run half a meter to the side, you need to take a single step or maybe even just move your upper body (of course, that depends on where the paintball is headed).
May
9
answered Normalization of the overlap $\langle x'|p'\rangle$
May
8
comment Why does Srednicki insist on $\phi$ having zero VEV?
But that's not the on-shell-forcing delta function, which would be $\delta(k^2+m^2)$ (in $-+++$ signature). This is just a four dimensional delta function, which forces $k$ to be the zero four-vector.
May
8
reviewed Approve Scalar Yukawa theory derivation
May
7
asked Why does Srednicki insist on $\phi$ having zero VEV?