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範例:地表拋體(重力場)與行星運動

某人在一星球表面上以速率 v 鉛直上拋一物體,經過時間 t 落回原拋射點。若該星球半徑為R,不計阻力,則至少需以多大速率沿星球表面拋射,才能使物體不落回該星球?(A)v t∕R  (B)  (C) (D) (E)2 v R∕t  [92南一中]

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Posted in 牛頓對克卜勒行星運動定律的解釋.

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