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# Fall 2007 - Kathryn Claire Welch PHY 231 Fall 2007 1...

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Unformatted text preview: Kathryn Claire Welch- PHY 231 Fall 2007 1 Correction 3 (11/25 Su midnight) Due date: Sun Nov 25 23:59:00 2007 Sit in row: K. Occupy every seat, don’t leave gaps. Are you sitting in the correct row? A. Yes, I am. Tries 0/12 The work done in accelerating a flywheel from rest to an angular speed of 12.3 revolutions per second is 11.1 kJ. What is the moment of inertia of the flywheel? Tries 0/12 A figure skater is spinning with her arms and one leg extended as far as she can. She then pulls them in tight to her body. As her position contracts, Choices: decreases , increases , remains the same . A. her angular momentum . B. her angular velocity . C. her moment of inertia . D. her rotational kinetic energy . Tries 0/12 Human bone has a Young’s modulus of about 1 . 8 × 10 10 Pa. Under compression it can withstand a stress of about 1 . 6 × 10 8 Pa. Assuming that a femur has a length of 49 cm, by what distance can the femur compress before breaking?...
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Fall 2007 - Kathryn Claire Welch PHY 231 Fall 2007 1...

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