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Unformatted text preview: kuehner (rjk679) CW10 Mackie (20211) 1 This print-out should have 2 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points In a popular amusement-park ride, a cylin- der of radius 2.73 m is set in rotation at an angular speed of 5.81 rad/s, as shown in the figure. The floor then drops away, leaving the riders suspended against the wall in a vertical position. The acceleration of gravity is 9 . 81 m / s 2 . 2 . 73 m What minimum coefficient of friction be- tween a riders clothing and the wall of the cylinder is needed to keep the rider from slip- ping? Correct answer: 0 . 106452. Explanation: Basic Concepts: F n = F c = m r 2 F s = s F n = s m r 2 F g = m g Given: r = 2 . 73 m = 5 . 81 rad / s g = 9 . 81 m / s 2 Solution: F s = F g s m r 2 = m g s = g r 2 = 9 . 81 m / s 2 (2 . 73 m) (5 . 81 rad / s) 2 = 0 . 106452 002 10.0 points A curve of radius 51 . 2 m is banked so that...
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- Spring '09