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Unformatted text preview: homework 13 ALIBHAI, ZAHID 1 Latest unpenalized work: Apr 23 2007 Mon day 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 25 2007, 4:00 am. Question 1 part 1 of 3 10 points A 2 . 2 kg object oscillates with an initial am plitude of 101 cm on a spring of force constant 98 . 8 N / m. Find the period. Answer in units of s. Question 2 part 2 of 3 10 points Find the total initial energy. Answer in units of J. Question 3 part 3 of 3 10 points If the energy decreases by 1 percent per period, find the damping constant b . Answer in units of kg / s. Question 4 part 1 of 1 10 points What beat frequencies are possible with tuning forks of frequencies 256, 259, and 261 Hz? 1. There are 3 possible beat frequencies, 515 Hz, 520 Hz, and 517 Hz. 2. There are 3 possible beat frequencies, 256 Hz, 259 Hz, and 261 Hz. 3. There are 4 possible beat frequencies, 2 Hz, 3 Hz, 5 Hz, and 7 Hz. 4. There are 3 possible beat frequencies, 2 Hz, 3 Hz, and 5 Hz. 5. There are 2 possible beat frequencies, 2 Hz and 3 Hz. Question 5 part 1 of 1 10 points A wave pulse on a string is described by the equation y 1 = A ( B x C t ) 2 + D . A second wave pulse on the same string is described by y 2 = A ( B x + C t E ) 2 + D , where x is in meters and t in seconds, and A = 5 . 7 m, B = 3 . 58 m 1 , C = 6 s 1 , D = 4 . 59, and E = 7 . 08. At what time will the two waves exactly cancel everywhere? Answer in units of s. Question 6 part 1 of 1 10 points Two wires are made of the same material but the second wire has twice the diameter and twice the length of the first wire. When the two wires are stretched, and the tension in the second wire is also twice the tension in the first wire, the fundamental frequency of the first wire is 920 Hz....
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