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[QUOTE]Originally posted by Joshua Bell: [QB] [QUOTE]Originally posted by Bernd: [qb] system momentum = sum of the particle momentum vectors + ship momentum = 0 [/qb][/QUOTE]That's it exactly. Now go ask a 10-year-old what happens if you attach a bent tube to the end of a balloon glued to a toy car. The 10 year old will get it right, since she's not thinking about momentum transfers. She's just thinking "the air goes this way so the car goes that way". This is one case where common sense is correct. Or watch a Harrier take off or land via VTOL, as someone pointed out previously. Or, even better, try it yourself. [qb] But how does this statement get along with Guardian 2000's pipe where the exhaust moves in the same direction as the ship? [/qb] The ship is still slowing. Imagine that the ship is at rest (relative to something, obviously) and the engines crank up with the funky hoses attached. The ship will start moving backwards. If you imagine what would happen on the filmstrip before t=0 the ship will have forwards momentum but be slowing due to the forwards exhaust. Again - just try it. Go out, buy a balloon, a toy car, and a bendy straw. [/QB][/QUOTE]
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