3. A 0.75-kg ball is attached to one end of a 1.25-m-long massless rod, and the other end of MEC200 the rod is hung from a pivot. Suppose the maximum height reached by the ball is such that the pendulum is 30 from the vertical: (a) What is the magnitude of the torque about the pivot when the ball is at its maximum height? (b) What is the centripetal acceleration of the ball when the ball is at its maximum height? (c) What is the tension force in the rod when the ball is at its maximum height? (d) What is the centripetal acceleration of the ball at 15 from vertical? (e) What is the tension force in the rod at 15 from vertical?