Determining Rotation Rate Required

A fairground attraction called the rotor is a spinning drum with a movable floor that is dropped down as the drum speeds up. The people are held onto the wall by friction. If the minimum friction coefficient is 0.5, what is the rotation rate required before the floor is dropped? The radius of drum is 5.0m.

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...force, is:
N=Mw2R=M (2*(pi)*f)^2 R (1)

In the vertical direction, gravity tends to drag the person down so the friction force, F, tends to counteract this effect. When the spinning speed is slow, the normal force is small. As a result, the ...