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Q. In a popular amusement park ride, the rotating cylinder of radius 3.0 m is set in rotation at an angular speed of 7.0 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider's clothing and the wall is needed to keep rider from slipping? (Hint: Recall that the magnitude of the maximum force of static friction is equal to µn, where n is normal force - in this case, the force causing the centripetal acceleration.)

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