A 494 kg uniform solid sphere has a radius of 0.390 m. Find the magnitude of the gravitational force exerted by the sphere on a 49.1 g particle located

Question

(a) 1.45 m from the center of the sphere
1 ? N
(b) at the surface of the sphere
2 ? N
(c) 0.200 m from the center of the sphere
3 ? N