At amusement parks, there is a popular ride where the floor of arotating cylindrical room falls away, leaving the backs of theriders "plastered" against the wall. Suppose the radius of the roomis 3.52 m and the speed of the wall is 11.5 m/s when the floorfalls away. The source of the centripetal force on the riders isthe normal force provided by the wall. (a) How much centripetal force acts on a 52.9 kg rider? (b) What is the minimum coefficient of static friction that must exist between the rider's back and thewall, if the rider is to remain in place when the floor dropsaway?