284 reputation
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location United States
age 48
visits member for 3 years, 10 months
seen Nov 24 '13 at 22:50

whatever.


Dec
16
awarded  Critic
Dec
11
answered Home experiments to derive the speed of light?
Dec
11
comment Orbital mechanics of Dragon's Egg
maybe whoever can answer this could also explain how six asteroids, orbiting their common center of gravity, while collectively orbiting a neutron star, could possibly be stable with the kind of tidal forces that would be present.
Dec
10
awarded  Teacher
Dec
4
comment Why won't my door close in the winter?
i think humidity is the culprit too. it's generally actually drier in the winter, and dry wood tends to shrink, and it just may be that his whole house shrinks a bit, and the door, less so.
Dec
4
comment Common false beliefs in Physics
ok, i'll leave it up. so, i suppose if one was capable of jumping to a height H, then one's legs should be capable of absorbing the PE of falling from height H, as well.
Dec
4
comment Common false beliefs in Physics
@Marek: yeah, people don't understand free-fall, and assume they could jump in such a situation. If you could do it, you'd transfer some of your starting potential energy to the elevator itself, but while you might be going up with respect to the elevator, you'd still be going down relative to the ground, only slightly less than if you didn't jump.
Dec
4
comment Common false beliefs in Physics
i'm considering deleting this b/c it's not really a false belief about physics, it's more of a physics-related urban myth
Dec
4
answered Common false beliefs in Physics
Dec
4
comment Accelerating particles to speeds infinitesimally close to the speed of light?
F=d(mv)/dt is what's generally applicable, it's just that everyone learns the approximation F=ma first, b/c it's close enough (for most observers) to assume that masses are constant.
Dec
4
answered Accelerating particles to speeds infinitesimally close to the speed of light?
Dec
3
awarded  Supporter