Question

The radius of planet A is half the radius of planet B .If the mass of planet A is Ma ,what must be the mass of planet B.So that the value of (g) on B is half of its value A

Answer 1

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Answer 2

SOLUTION :-

Data : rA=rB/2

gB=GM/R2

therefore

gA = GMa/rA2

and

gB= GM/rB2

therefore

gB = mB rA 2

gA. mA. rB

mB/ma =4/2

=2

therefore

mB = 2mA

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