Question

A ride consisted of a large wooden wheel nearly 6 meters in diameter on which several people climbed the wheel would then spin causing all but the passengers closest to the center off. Suppose a 55 kg passenger with a tangential speed of 1.3 m/s was just barely able to stay on the wheel. If the magnitude of the frictional force that held the passenger on the wheel was 135 N how far was the passenger from the center of the wheel

Answer 1

Is there a diagram? the wheel is vertical or horizontal?

Answer 2

when one "just barely able to stay on the wheel" it means that the reaction force is zero.