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Unformatted text preview: Thevalingam, Donald Homework 16 Due: Jan 22 2007, midnight Inst: Eslami 1 This print-out should have 11 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 During a certain time interval, a constant force delivers an average power of 4 watts to an object. If the object has an average speed of 2 meters per second and the force acts in the direction of motion of the object, what is the magnitude of the force ~ F ? 1. k ~ F k = 4 N 2. k ~ F k = 6 N 3. k ~ F k = 16 N 4. k ~ F k = 2 N correct 5. k ~ F k = 8 N Explanation: The object moves at a constant accelera- tion, so the final speed is twice the average speed. P = W t = F d t = F v , so k ~ F k = P v = 2 N keywords: 002 (part 1 of 2) 10 points Assume your mass is 94 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 . 1 m high? Correct answer: 1934 . 52 J....
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