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Hwk9A

# Hwk9A - 0 mm At t = 0 s the hook is at its lowest point(a...

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PHYS 153 Homework 9A Problem 1 A concert loudspeaker suspended high above the ground emits 35 W of sound power. A small microphone with a 1 . 0 cm area is 50 m from the speaker. (a) What is the sound intensity at the position of the microphone? (b) How much sound energy impinges on the microphone each second? Problem 2 The figure below is a history graph at x = 0 m of a wave traveling in the positive x -direction at 4 . 0 m / s. (a) What is the wavelength? (b) What is the phase constant of the wave? (c) Write the displacement equation for this wave. - 0.1 0.1 0.2 0.3 0.4 0.5 t H s L - 2 - 1 1 2 D H mm L History graph at x = 0 m Wave traveling right at 4.0 m s Problem 3 A string with linear density 2 . 0 g / m is stretched along the positive x -axis with tension 20 N. One end of the string, at x = 0 m, is tied to a hook that oscillates up and down at a frequency of 100 Hz with a maximum displacement of 1

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Unformatted text preview: . 0 mm. At t = 0 s, the hook is at its lowest point. (a) What are the wave speed on the string and the wavelength? (b) What a re the amplitude and phase constant of the wave? (c) Write the equation for the displacement D ( x, t ) of the traveling wave. (d) What is the string’s displacement at x = 0 . 50 m and t = 15 ms? 1 - 1 Problem 4 A 2 . 0-m-long string vibrates at its second-harmonic frequency with a maximum amplitude of 2 . 0 cm. One end of the string is at x = 0 cm. Find the oscillation amplitude at x = 10 , 20 , 30 , 40 , and 50 cm. Problem 5 An open-open organ pipe is 78 . 0 cm long. An open-closed pipe has a fundamental frequency equal to the third harmonic of the open-open pipe. How long is the open-closed pipe? 1 - 2...
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Hwk9A - 0 mm At t = 0 s the hook is at its lowest point(a...

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