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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
等速率圓周運動與半徑的關聯
Jun 15th 2013, 15:13

若一顆衛星目前位於離地表R的位置處作等速率圓周運動，R為地球半徑，速率為V，倘若有顆等重之衛星位於離地表3R的位置處也作等速率圓周運動，那它的速率為何??

我要問的其實沒這題目也行，不過我還是提一下我作答時的困擾!
就是啊!
F=GMm/R平方=mV平方/R→V=根號(GM/R)正比於根號(1/R)
還有
角動量守衡:mVR=不變量→V正比於1/R

那我到底應該用哪個解題才好呢??

我知道橢圓軌道運動一定要用克卜勒第2定律，也就是角動量守恆去解題，但剛剛爬了文，有位大大說等速圓周運動兩者都適用，這樣對嗎?

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