planet Q moves in a fairly elliptical orbit around the sun.P
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planet Q moves in a fairly elliptical orbit around the sun.Planet Q‘s speed is 35.2km/s when it is at its most distant point ,7.68x10^10 m from the sun.How far is planet Q from the sun at its closest point ,where tis speed is 83.0km/s?
x = 35.2km/s x 7.68x10^10 m/ 83.0km/s = 3.26x10^10m
动量矩守衡.
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