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## Homework Statement

What is the gravitational force acting on a sphere on particle 'm' located at distance 'r' from center of sphere, assuming it is a uniform sphere of matter that has mass M, radius a, and a concentric cavity of radius a/3.

Solve for r= a/6, r= 2a/3, r= 3a/2

I believe all I need is:

F= G(m1m2/r^2)

I have not attempted to solve, I would like to know it if this is the correct equation to use.

Thanks.