1. Two balls of the ends of two strings are moving at the same speed in horizontal circular paths. One string is three times as long as the other compare the magnitude of the two centripetal accelerations. Explain your answer. 2. The magnitude of the force of gravitational attraction between two uniform spherical masses is 36N. Explain how you would calculate the change in the magnitude of the force, if one mass were doubled, and the distance between the objects tripled