Question: On the ride "Spindle top" at the amusement park Six Flags over Texas, people stood against the inner wall of a hollow vertical cylinder with radius 2.76 m. The cylinder started to rotate, and when it reached a constant rotation rate of 0.760 rev/ s, the floor on which the people were standing dropped about 0.500 m. The people remained pinned against the wall.

Part A: What minimum coefficient of static friction is required if the person on the ride is not to slide downward to the new position of the floor?

I need help to find what minimum coefficient of static friction is required if the person on the ride is not to slide downward to the new position of the floor.