A boy is on a Ferris wheel, which takes him in a vertical circle of radius 5.5 m once every 21.0 s.
(a) What is the angular speed of the Ferris wheel?
(b) Suppose the wheel comes to a stop at a uniform rate during one quarter of a revolution. What is the angular acceleration of the wheel during this time? (Enter the magnitude of the angular acceleration.)
(c) Calculate the tangential acceleration of the boy during the time interval described in part (b). (Enter the magnitude of the tangential acceleration.)