GravitationHard
Question
A man of mass m starts falling towards a planet of mass M and radius R. As he reaches near to the surface, he realizes that he will pass through a small hole in the planet. As he enters the hole, he seen that the planet is really made of two pieces a spherical shell of negligible thickness of mass 
and a point mass 
at the centre. Change in the force of gravity experienced by the man is :
and a point mass at the centre. Change in the force of gravity experienced by the man is : Options
A.
B.0
C.
D.
Solution
Gravitational field inside the shell is zero. But the force on the man due to the point mass at the centre is
FNew =
; Fold = 
Change in force =
FNew =
; Fold = Change in force =
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