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Unformatted text preview: marout (ssm979) – homework 25 – Turner – (58220) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A skater spins with an angular speed of 10 . 8 rad / s with his arms outstretched. He lowers his arms, decreasing his moment of in- ertia from 43 kg · m 2 to 40 kg · m 2 . a) Calculate his initial rotational kinetic energy. Answer in units of J. 002 (part 2 of 2) 10.0 points b) Calculate his final rotational kinetic en- ergy. Answer in units of J. 003 (part 1 of 3) 10.0 points Assume: The small objects are point parti- cles. The system of five small 7 kg objects is rotating at an angular speed of 8 rad / s. The objects are connected by light, flexible spokes that can be lengthened or shortened. x y 7 kg 7 kg 7 kg 7 kg 7 kg 8 r a d / s 5 m What is the initial angular momentum of the object?...
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This note was uploaded on 04/06/2010 for the course PHYS 303K taught by Professor Niu during the Spring '08 term at University of Texas.
- Spring '08