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Unformatted text preview: Practice problems for midterm I, Phy9B- B, Fall 2006 1) A transverse wave is propagated in a string stretched along the x- axis. The equation of the wave, in SI units, is given by: y = 0.005 cos (38t- 17x). The wave speed, including the sense of direction along the x- axis, in SI units, is closest to: A)- 0.45 B) 0.45 C)- 2.2 D) 2.2 E) zero 1) 2) A string, 60 cm long and having a mass of 41 g, is attached to a 970 Hz vibrator at one end. The other end of the string is xed and the string is kept under tension. The vibrator produces a transverse wave in the string, whose amplitude is 8.0 mm, and which propagates with a velocity of 18 m/s. The energy of the wave is absorbed at the xed end. In this situation, the average power transmitted by the wave, in SI units, is closest to: A) 2200 B) 1500 C) 3000 D) 4400 E) 3700 2) 3) A wave on a stretched string is described by y = 0.004 sin (300t- 15x). What is the maximum velocity of a particle on the string? A) 8.37 x 10- 5 m/s B) 0.060 m/s C) 5.56 m/s D) 20.0 m/s E) 1.20 m/s 3) 4) A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 65 dB to 49 dB. The factor, by which the acoustic power entering the chamber is reduced by the glass window, is closest to: A) 2.3 10- 1 B) 2.5 10- 2 C) 8.6 10- 2 D) 1.6 10- 1 E) 2.9 10- 1 4) 5) An open pipe, 0.57 m long, vibrates in the second overtone with a frequency of 937 Hz.Hz....
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