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I'm having trouble with the following question:

There is a spherical hollow inside a lead sphere of radiusR; the surface of the hollow passes through the center of the sphere and touches the right side of the sphere. The mass of the sphere before hollowing wasM. With what gravitational force does the hollowed-out lead sphere attract a small sphere of massmthat lies a distancedfrom the center of the lead sphere, on the straight line connecting the centers of the spheres and of the hollow?

My guess is to integrate [tex] dF = G \frac {m} {(r_i)^2} \mbox {\em dM} [/tex] . Is this right?

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# Homework Help: Newtonian Gravitation with an extended body

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