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# dynamics of circular motion

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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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This job applies the dynamics of circular motion.

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First look at the force diagram for a person. When the floor is dropped, there are three forces on the person, the normal force by the wall (N), the gravity (Mg) and the friction force (F).
The equation for the normal force, which acts as the centripetal ...

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