Acceleration due to gravity on moon is 1/6 of the acceleration due to gravity on earth. If the ratio of densities pf earth ρe and moon ρm is ρeρm=53 then radius of moon Rm in terms of Re will be
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a
518Re
b
16Re
c
718Re
d
123Re
answer is A.
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Detailed Solution
Acceleration due to gravityg=43πρGR ∴g∝ρRor gmge=ρmρe⋅RmRe As gmge=16 and ρeρm=53 given ∴RmRe=gmgeρeρm=16×53 ∴ Rm=518Re
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Acceleration due to gravity on moon is 1/6 of the acceleration due to gravity on earth. If the ratio of densities pf earth ρe and moon ρm is ρeρm=53 then radius of moon Rm in terms of Re will be