AL phy 98-1
如果要get into a lower orbit
要total mechanical energy decrease
then KE decrease
所以要v decrease 先
但係KE=1/2mv²=Gm1m2/2r
如果v decrease,r咪increase?
AL physics gravitation
2007-12-09 7:54 am
回答 (1)
2007-12-09 11:11 am
✔ 最佳答案
total mechanical energy decrease係正確k.e decrease先都正確,但係k.e decrease,p.e都係接下來decrease。你唔可以單考慮k.e。
PE = –GMm/r
Ek : Ep = 1 : –2
Total energy E = Ek + Ep =–GMm/2r
pe decrease係兩倍,因此Total energy下跌。-GMm/2r下跌。GMm/2r上升,因此r應該係細左。
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