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Practice Problems 3

# Practice Problems 3 - khounvivongsy(sk27799 Practice...

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khounvivongsy (sk27799) – Practice Problems 3 – Weathers – (17104) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Two harmonic waves are described by y 1 = A sin( k x - ω t ) , y 2 = A sin( k x + ω t ) , where A = 6 . 7 mm, k = 4 . 9 rad / m and ω = 3100 rad / s. What is the amplitude y max ( x ) of the resul- tant wave at x = 1 . 52 m? Answer in units of mm. 002 10.0 points Two harmonic waves are described by y 1 = A sin(3 x - 5 t ) , y 2 = A sin(3 x - 5 t - 4) . A = 11 m, with x and t being given in SI units and the phase angles in radians. What is the displacement of the sum of these two harmonic waves, y 1 + y 2 , at x = 1 m, t = 1 s? Answer in units of m. 003 10.0 points Two identical harmonic waves with wave- lengths of 3 . 2 m travel in the same direction at a speed of 3 . 5 m / s. The second wave origi- nates from the same point as the first, but at a later time. Determine the minimum possible time in- terval between the starting moments of the two waves if the amplitude of the resultant wave is the same as that of the two initial waves. Answer in units of s. 004 (part 1 of 2) 10.0 points The acoustical system shown in the figure is driven by speaker emitting a 392 Hz note. The speed of sound is 345 m / s. S Speaker Receiver r 1 r 2 If destructive interference occurs at a par- ticular instant, by what minimum amount

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