In a popular carnival ride called The Centrifuge, shown above, riders stand against the inside wall of a large cylinder, which starts spinning. The radius of the circle traveled by the riders is 5.3 m. The coefficient of static friction between a person's shirt and the wall of the ride is 0.31. At what speed must the riders be moving to not slip downward when the floor lowers? To the nearest 0.01 m/s ( use 10 m/s2 for gravity)