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Jul
18
comment Pair annihilation - how to generaly solve these types of problems?
It may be helpful to consider the problem in a 2D plane. Then, the momenta of the photons are four unknowns; the conservation of momentum and energy gives three equations. That the photons have the same energy gives the fourth equation. The rest is simply algebra.
Jul
17
comment Pair annihilation - how to generaly solve these types of problems?
What are you trying to solve for?
Jul
11
reviewed Reviewed Maxwell's equations in curved spacetime
Jul
9
comment Rate of twinkling of stars
How do you calculate the frequency from the size of turbulent elements?
Jul
9
asked Rate of twinkling of stars
Jul
7
reviewed No Action Needed Is it necessary to consume energy to perform computation?
Jul
6
reviewed Reviewed A correct explanation for the levitation of a superconductor above a magnet
Jul
4
reviewed Reviewed How to determine the region that would contain a quantum particle
Jun
24
comment When a moving body collides with a stationary body, far from its centre, how do you calculate the resulting spin
@StevenNoble The angular momentum prior to the collision is nonzero.
Jun
23
comment When a moving body collides with a stationary body, far from its centre, how do you calculate the resulting spin
Consider the conservation of angular momentum.
Jun
23
comment What happens if torque = 0?
The torque is zero only when $\theta=0$.
Jun
23
comment What sort of thermodynamic process is this?
Suitable constants can probably be introduced to the equation to make it dimensionally self-consistent.
Jun
19
comment What happens with the force of gravity when the distance between two objects is 0?
possible duplicate: physics.stackexchange.com/q/2481
Jun
19
comment What happens with the force of gravity when the distance between two objects is 0?
$GmM$ is not constant along the path to the center of the Earth. $M$ starts to decrease once you are underground, and becomes zero right at the center of the Earth.
Jun
16
revised Toward the establishment of non-equilibrium (quasi-equilibrium) magnon BEC theory
tex, removed greeting
Jun
16
suggested approved edit on Toward the establishment of non-equilibrium (quasi-equilibrium) magnon BEC theory
Jun
14
reviewed Reviewed Neutral pions and chromodynamics
Jun
12
comment How can Magnets be used to pick up pieces of metal when the force from a magnetic field does no work?
related: physics.stackexchange.com/q/10565
Jun
12
accepted Differences between spin waves and spin density waves
Jun
12
revised How does a phonon cause two electrons to attract each other and form a cooper pair?
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