When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 950 N and the drag force has a magnitude of 1100 N. The mass of the sky diver is 96.9 kg. What are the magnitude and direction of his acceleration?

Answer 1

On earth, two parts of a space probe weigh 18000 N and 3100 N. These parts are separated by a center-to-center distance of 15 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects.