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solution-hw24 - lai(yl8859 – HW24 – Ross –(15200 1...

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Unformatted text preview: lai (yl8859) – HW24 – Ross – (15200) 1 This print-out should have 7 questions. Multiple-choice 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 : ℓ = 6 . 23 m , m = 0 . 212 kg , and Δ t = 0 . 851 s . One complete trip is a distance of 2 ℓ , so the speed is v = d total Δ t = 4 (2 ℓ ) Δ t = 8 ℓ Δ t . The linear density is μ = m ℓ , so v = radicalBigg F μ F = μ v 2 = m ℓ parenleftbigg 8 ℓ Δ t parenrightbigg 2 = 64 mℓ (Δ 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 μ = . 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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solution-hw24 - lai(yl8859 – HW24 – Ross –(15200 1...

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