Posted by **shelby** on Wednesday, February 13, 2008 at 7:33pm.

The Wall of Death in an amusement park is comprised of a vertical cylinder that can spin around the vertical axis. Riders stand against the wall of the spinning cylinder and the floor falls away leaving the riders held up by friction. The radius of the cylinder is 4.2 m and the coefficent of static friction between the rider and the wall is 0.47. Find the minimum number of revolutions per minute necessary so that the riders do not slip down the wall (note: to specify revolutions per minute as the units in your answer, enter rev/min).

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