Question

79. A planet has a mass M, and radius Ri.
The value of acceleration due to gravity
on its surface is g. There is another
planet 2, whose mass and radius both
are two times that of the first planet.
Which one of the following is the
acceleration due to gravity on the
surface of planet 2?
(a) g1
(b) 2g1
c)g1/2
(d) g1/4​

Answer 1

Answer:

option c

Explanation:

g₁=GM/R²

g₂=2GM/(2R)²

   =2GM/4R²

g₁:g₂=GM/R² : 2GM/4R²

       =1:1/2

the value of g becomes 1/2 the previous value

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