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# prep2 - Prep for Midterm II Physics 111 1 In a Rotor-Ride...

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Prep for Midterm II Physics 111 1. In a Rotor-Ride at a carnival, riders are pressed against the inside wall of a vertical cylin- der 2 . 00 m in radius rotating 1 . 10 revolutions per second when the floor drops out. (a) What is the speed of a rider in m/s? (b) What is the acceleration of a rider? (c) What minimum coefficient of static friction is needed so that the rider will not slip down the inside wall of the cylinder? 2. A man pushes an 80 . 0 N crate a distance of 5 . 00 m upward along a frictionless slope that makes an angle of 30 o with the horizontal. The force that he exerts is parallel to the slope. If the speed of the crate increases at a rate of 1 . 50 m/s 2 , how much work is done by the man? 3. A 420 -g ball is attached to one end of a horizontal cord of length L = 2 m and the other end is fixed as shown in the figure below. L h Peg (a) If the ball is released from rest, what will be its speed at the lowest point of its path?

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prep2 - Prep for Midterm II Physics 111 1 In a Rotor-Ride...

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