Q38: An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of rev/s when the length of the chain is m. When he increases the length to m, he is able to rotate the ball only rev/s.
(a) Which rate of rotation gives the greater speed for the ball?
(b) What is the centripetal acceleration of the ball at rev/s?
(c) What is the centripetal acceleration at rev/s?