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81204hw11 - Zzztayloe Rex Homework 11 Heinz 81204 This...

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Zzztayloe, Rex – Homework 11 – Heinz – 81204 – Nov 04, 2004 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Bone has a Young’s modulus of about 1 . 8 × 10 10 Pa. Under compression, it can withstand a stress of about 1 . 55 × 10 8 Pa before breaking. Assume that a femur (thigh bone) is 0 . 46 m long, and calculate the amount of compres- sion this bone can withstand before breaking. Answer in units of mm. 002 (part 1 of 1) 10 points A wooden platform is suspended from a ceil- ing by four steel wires at its four corners. Each wire is 7 . 2 m long and of diameter of 2 . 6 mm. The Young modulus of steel is 2 × 10 11 N / m 2 . Two people stand at the center of the plat- form, and the total weight of the two people and the platform is 1800 N. How much do the wires stretch? Answer in units of mm.
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