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Unformatted text preview: lai (yl8859) HW24 Ross (15200) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A phone cord is 6 . 23 m long. The cord has a mass of 0 . 212 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0 . 851 s. What is the tension in the cord? Correct answer: 116 . 72 N. Explanation: Let : = 6 . 23 m , m = 0 . 212 kg , and t = 0 . 851 s . One complete trip is a distance of 2 , so the speed is v = d total t = 4 (2 ) t = 8 t . The linear density is = m , so v = radicalBigg F F = v 2 = m parenleftbigg 8 t parenrightbigg 2 = 64 m ( t ) 2 = 64 (0 . 212 kg) (6 . 23 m) (0 . 851 s) 2 = 116 . 72 N . keywords: 002 10.0 points A 2 . 8 kg block supported by a string rests on a frictionless incline. The length of the string is 0 . 2 m and its mass of 1 . 8 g 2 . 8 kg. 2 . 8 k g = . 2 m 26 Determine the time it takes a transverse wave to travel from one end of the string to the other. The acceleration of gravity is 9 . 8 m / s 2 ....
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This note was uploaded on 02/24/2011 for the course PHYS 152 taught by Professor Button during the Winter '08 term at IUPUI.
 Winter '08
 BUTTON
 mechanics, Mass

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