HW 6-solutions

HW 6-solutions - virani(sv2339 – HW 6 – moura –(58650...

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Unformatted text preview: virani (sv2339) – HW 6 – moura – (58650) 1 This print-out should have 12 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 Assume your mass is 66 kg. The acceleration due to gravity is 9 . 8 m / s 2 . How much work against gravity do you do when you climb a flight of stairs 2 . 5 m high? Correct answer: 1617 J. Explanation: Let : m = 66 kg , g = 9 . 8 m / s 2 , and h = 2 . 5 m . W = mg h = (66 kg) (9 . 8 m / s 2 ) (2 . 5 m) = 1617 J . 002 (part 2 of 2) 10.0 points Consider the energy consumed by a 200 W light bulb in an hour. How many flights of stairs would you have to climb to equal the work of the lightbulb? Correct answer: 445 . 269. Explanation: For the light bulb: E = P t = (200 W) (3600 s) = 7 . 2 × 10 5 J , n = E W = 7 . 2 × 10 5 J 1617 J = 445 . 269 . 003 (part 1 of 2) 10.0 points A bead slides without friction around a loop- the-loop. The bead is released from a height h from the bottom of the loop-the-loop which has a radius r . h r Which of the following diagrams best rep- resents the kinetic energy of the bead versus time? 1. t K correct 2. t K 3. t K 4....
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HW 6-solutions - virani(sv2339 – HW 6 – moura –(58650...

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