1. (a) Why do we not notice the force of gravitational attraction between two ordinary objects such as a pair of books? (b) Why does the weight of a rocket change as it moves further away from the earth? 2. When a satellite is a distance R from the center of Earth, the force due to gravity on the satellite is F. What is the force due to gravity on the satellite when its distance from the center of Earth is 3R? 3. (a) What provides the centripetal force that keeps a satellite in an orbit? (b) On what factors does the velocity with which a satellite must be launched in an orbit depend? 4. Explain why a satellite launched two hundred kilometers above the earth will gradually spiral in toward the earth 5. Explain why objects in a satellite orbiting around the earth appear to be weightless. 6. What does a 1000-kg rocket weigh when it is 7.0 x 10 m from the center of the earth? 7. A 45 kilogram woman is 2.5 meters away from a 65 kilogram man. Calculate the gravitational force of attraction between them. 8. What is g at a point in the earth's gravitational field where a 10-kg mass weighs 95 N