作者Timothy0225 (暴食者打我)
看板Physics
标题[问题] 中心力场运动
时间Wed Dec 30 22:59:25 2009
A space craft (m) is designed to dispose of nuclear waste
by crashing into the Sun (M) along an elliptical orbit
with minimum distance R (Sun's radius)
and maximum distance r (radius of Earth's orbit) from the Sun's center
Q:what initial velocity v of the craft relative to Earth is needed ?
题目我是照抄的
请问一下这题的条件是不是少给了一项?
按照题目有办法找出太空船在近日点 & 远日点的动能
可是好像没办法找出地球在 r 处的动能? (只给r好像没办法决定地球的椭圆轨道?)
想请问各位有什麽方法能找出地球在 r 处的动能吗
还是说我根本就用错方法了?XD
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