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Questions  

The escape velocity from a spherical planet is vo. What is the escape velocity corresponding to another planet of twice the radius and half the mean density?

a
(2)v0
b
v02
c
2v0
d
4v0

detailed solution

Correct option is A

vo=2GMR=2G43πR3ρR=2R23πGρv0'=2(2R)23πGρ2=2v0

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