A particle is to be placed, in turn, outside four objects, each of mass m and ea

Question

A particle is to be placed, in turn, outside four objects, each of mass m and each made of the same material: (1) a very large (beachball sized) uniform solid sphere, (2) a large (beachball sized) unifrom spherical shell, (3) a small (ping-pong ball sized) uniform solid sphere, and (4) a small (ping-pong ball sized)  uniform shell. In each situation, the distance between the particle and the center of the object is d.

1)

Rank the objects according to the magnitude of the gravitational force they exert on the particle, greatest first.

a) 1,3,2,4

b) 1,2,3,4

c) 3,4,1,2

Explanation / Answer

material is same for all the object.
lets say density of material is p.

mass = volume x density

highest volume will be of very large solid phere, then very large shell then small phere
then small shell.

F = Gm1m2 / d^2

heavy mass means more force.

so ans. 1234

(anyways it is not sure about width of shell if shell is just a very very tiny surface then answer will 1324.

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