MP #16

MP #16 - . A child with a mass of 41.0 , initially standing...

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1 of 2 [ Print View ] Class PH1110A2007 Assignment 16 Due at 5:00pm on Monday, October 8, 2007 View Grading Details Problem 10.40 The Spinning Figure Skater. The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center . When his hands and arms are brought in and wrapped around his body to execute the spin, the hands and arms can be considered a thin-walled hollow cylinder. His hands and arms have a combined mass 8.0 kg. When outstretched, they span 1.8 m; when wrapped, they form a cylinder of radius 25 cm. The moment of inertia about the rotation axis of the remainder of his body is constant and equal to . Part A If his original angular speed is 0.40 rev/s, what is his final angular speed? Express your answer using two significant figures. ANSWER: 1.1 rev/s Problem 10.42 A large turntable rotates about a fixed vertical axis, making one revolution in a time of 6.10 . The moment of inertia of the turntable about this axis is 1210
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Unformatted text preview: . A child with a mass of 41.0 , initially standing at the center of the turntable, runs out along a radius. Part A What is the angular speed of the turntable when the child is a distance of 2.10 from the center? (Assume that you can treat the child as a particle.) ANSWER: 0.896 rad/s Problem 10.96 A runner of mass 56.0 runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its center. The runner's velocity relative to the earth has magnitude 3.10 . The turntable is rotating in the opposite direction with an angular velocity of magnitude 0.210 relative to the earth. The radius of the turntable is 3.10 , and its moment of inertia about the axis of rotation is 81.0 . Part A 2 of 2 Find the final angular velocity of the system if the runner comes to rest relative to the turntable. (You can treat the runner as a particle.) ANSWER:-0.842 rad/s Summary 3 of 3 items complete (100% avg. score) 30 of 30 points...
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This note was uploaded on 04/29/2008 for the course PH 1110 taught by Professor Kiel during the Fall '08 term at WPI.

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MP #16 - . A child with a mass of 41.0 , initially standing...

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