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Unformatted text preview: yoon (jy4326) HW04 markert (58840) 1 This printout should have 12 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points You new motorcycle weighs 2440 N. The acceleration of gravity is 9 . 8 m / s 2 . What is its mass? Correct answer: 248 . 98 kg. Explanation: Weight is W = mg so m = W g = 2440 N 9 . 8 m / s 2 = 248 . 98 kg 002 10.0 points A female gymnast weighs 600 N. If she is hanging stationary from a high bar, how many forces are acting on her? 1. three 2. two correct 3. four 4. five 5. one Explanation: Two forces act on her: gravity pulls down on her and the bar pulls up on her. These forces are equal (600 N), but act in opposite directions. 003 (part 1 of 2) 10.0 points A light, inextensible cord passes over a light, frictionless pulley with a radius of 11 cm. It has a(n) 14 kg mass on the left and a(n) 8 . 9 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 2 . 3 m apart. The acceleration of gravity is 9 . 8 m / s 2 . 2 . 3 m 11 cm 14 kg 8 . 9 kg At what rate are the two masses accelerat ing when they pass each other? Correct answer: 2 . 18253 m / s 2 . Explanation: Let : R = 11 cm , m 1 = 8 . 9 kg , m 2 = 14 kg , h = 2 . 3 m , and v = R. Consider the free body diagrams 14 kg 8 . 9 kg T T m 2 g m 1 g a a Since the larger mass will move down and the smaller mass up, we can take motion downward as positive for m 2 and motion up ward as positive for m 1 . Apply Newtons second law to m 1 and m 2 respectively and then combine the results: For mass 1: summationdisplay F 1 : T m 1 g = m 1 a (1) For mass 2: summationdisplay F 2 : m...
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 Fall '09
 BOCKNACK
 Organic chemistry

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