An extended object is in static equilibrium if the net torque acting on the object is zeroeither the net force acting on the object is zero or the net torque acting on the object is zeroboth the net force acting on the object is zero and the net torque acting on the object is zeroonly the net force acting on the object is zero

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 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2