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[QUOTE]Originally posted by Identity Crisis: [QB] Maths is short for mathematics. Surely you know that? Oh yeah, for some reason people on the other side of the Atlantic drop the final 's'. Dunno why. Your diagram with the rocket shows why a flat plate, although giving simple maths, confuses people. They see the particle hitting the rocket again and that just seems wrong. If rocket exhaust goes into a closed box attached to the rocket then no thrust has been generated - for all intents and purposes the exhaust hasn't left the ship. So in my exampe I added my two 45deg plates in order to make the exhaust end up going forwards but not back into the ship. (This was a simplified case, other people had previously drawn a more rounded tube with many collisions. Bugger doing the maths on that). You say "Incidentally, a collision simulator I was using seems to agree with this view, insofar as it shows a .5-.5 momentum transfer from the light particle against a stationary wall." But in this case the wall is not stationary. The wall has equal but opposite momentum to the particle. This is the case with the desktop balls where you set both of the end balls swinging at once. Would it help if I gave you the matrix tansformation to convert a vector in x,y co-ordinates into a vector in your rotated 45deg co-ordinate system? I am having trouble following your diagram. I'm also getting pissed off with trying to write maths in ascii. I may write it out longhand and scan it. Quicker than fiddling about with any of the software I've got installed here. [/QB][/QUOTE]
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