angular momentum

It is easy to show that two inertial observers in relative motion do not agree on the conservation of linear momentum when they observe emission of one photon. The thought experiment: An LED flashlight in an intergalactic space emits one photon (wave packet) with the momentum P. The recoil...

This is largely a re-post from the February Stundie nominations in the Conspiracy Theories subforum. There, it's just an anecdote to go along with the topic of a nomination. Here, I am looking for the explanation. So who can help me out here? A little true story: We had finished the...

According to Neil deGrasse Tyson's twitter feed: http://twitter.com/neiltyson/status/12578210448 If the Earth spun 18 times faster he says that people at the equator would float.... I'm sure I'm missing something, but if they were floating, how would they retain the angular moment required to...

Saw this cartoon on www.xkcd.com and am not sure if it is true. The idea is that a person spinning round gives/takes angular momentum to the planet. Is this really true? Would the amount given when the person speeds up be taken back again when slowing down? Is there a way round this? Also is...

I've been looking into extreme-distance shooting and calibers lately, .408 Chey Tac, .338 Lapua, .50 BMG and the like, and it occurs to me that the ballistic coefficient of the projectiles is quite important. At the distance of a mere kilometer, a .600 BC .50 BMG bullet will have lost half of...

Prof Steven Jones says that the top portion of the south towere tilted 27 degrees but then stopped. He posits that the angular momentum couldnt suddenly cease unless the centre of mass disappeared. Sounds reasonable. Do any of you know of a debunking for it?