Question
Sat September 12, 2009 By:

supose there existed a planet that went around the sun twice as fast as the earth.what would be its

Expert Reply
Wed November 04, 2009

The gravitational force provides the centripetal force for orbital motion.

mV2/R = GMm/R2

R  1/V2

Rp/RE = (VE/Vp)2  

Vp = 2VE

Rp = RE/4

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