In a "Rotor-ride" at a carnival, people rotate in a vertical cylindrically walled "room." pt a If the room radius was 5.2 , and the rotation frequency 0.35 revolutions per second when the floor drops out, what minimum coefficient of static friction keeps the people from slipping down? [Hint: Draw a free-body diagram for a person.] pt b People on this ride said they were "pressed against the wall." Is there really an outward force pressing them against the wall?