A solid sphere of uniform density has a mass of 11850 kg and a radius of 71 m.
(a) What is the magnitude of the gravitational force due to the sphere on a particle of mass 4.2 kg located at a distance of 76 m from the center of the sphere?
(b) What is the magnitude of the gravitational force due to the sphere on a particle of mass 4.2 kg located at a distance of 69 m from the center of the sphere?