A 42.0-kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 16.0 m. (a) What is the centripetal acceleration of the child? magnitude direction m/s ---Select--- (b) What force (magnitude and direction) does the seat exert on the child at the lowest point of the ride? magnitude direction ---Select--- N (c) What force does the seat exert on the child at the highest point of the ride? magnitude direction ---Select--- N (d) What force does the seat exert on the child when the child is halfway between the top and bottom? (Assume the Ferris wheel is rotating clockwise and the child is moving upward.) magnitude N direction counter-clockwise from the horizontal