It appear that the the normal force (due to contact between person and rotor's inner surface) provides the centripetal force. It is slightly difficult to visualize that there will be such a strong normal force (as the person is not standing on wall just touching it). Can someone please explain?
Further, if the rotor was not rotating, although the person would fall down, you still have normal force. But when it starts rotating at certain speed (dependent on static friction) the person doesn't fall. The normal force hasn't changed now. What really changed from not moving to moving of rotor that person doesn't fall? Can someone please explain?