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HW20 - Thevalingam Donald Homework 20 Due Mar 4 2007...

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Thevalingam, Donald – Homework 20 – Due: Mar 4 2007, midnight – Inst: Eslami 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Hey guys, instead of giving me ten defini- tions for a little grade improvement in the last minute, you need to solve five problems, but not for me, for yourselves. I do not need your solving problems; you need it! I have solved mine years ago when you were still crawling :)) 001 (part 1 of 1) 10 points A bobsled slides down an ice track starting (at zero initial speed) from the top of a(n) 194 m high hill. The acceleration of gravity is 9 . 8 m / s 2 . Neglect friction and air resistance and de- termine the bobsled’s speed at the bottom of the hill. Answer in units of m / s. 002 (part 1 of 1) 10 points A(n) 662 kg elevator starts from rest. It moves upward for 4 . 3 s with a constant acceleration until it reaches its cruising speed of 1 . 91 m / s.

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