A passenger with mass 85 kg rides on a Ferris wheel (ride which moves in a vertical circle). The seats travel in a counterclockwise vertical circle of radius 35 m. The Ferris wheel rotates at constant speed and makes one complete revolution every 25 s. a. Calculate the magnitude and direction of the force exerted on the passenger by the seat when she is one-eighth revolution past her lowest point. Note that the seat can exert both a horizontal (frictional) and vertical (normal) force on the passenger. b. What is the minimum coefficient of static friction to prevent the passenger from sliding on the seat when she is one-quarter revolution past her lowest point