assign102k6

# assign102k6 - reaches terminal velocity A worker in an...

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Physics 153 Assignment 9 Due Friday December 1, 2006 by 5:30pm 1. A sound wave with 40cm wavelength enters the tube shown below at the source end. What must be the smallest radius r such that a minimum is heard at the detector end? 2. Three successive resonance frequencies in an organ pipe are 1310, 1834, and 2358 Hz. Take the speed of sound in air to be 343 m/s. Is the pipe closed at one end or open at both ends? Justify your answer with both sentences and equations. What is the fundamental frequency of the pipe? What is the length of the pipe? 3. An ambulance emitting a whine of 1600Hz overtakes and passes a cyclist pedaling a bike at 8.00 ft/s. After being passed, the cyclist hears a frequency of 1590Hz. How fast is the ambulance traveling? 4. A careless tourist accidentally falls oﬀ the top of the Empire State Building. He quickly
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Unformatted text preview: reaches terminal velocity. A worker in an oﬃce in the building notes that the frequency of tourist’s scream decreases from 846 to 824 Hz as he passes her window. Note the speed of sound in air is 343 m/s. What is the speed of descent of the tourist? The tourist’s scream generates beats when it is mixed with its echo from the sidewalk at the foot of the building. Find the number of beats per second heard by the worker after the tourist has passed by the window. (Hint: what is the frequency of the scream heard by a passerby on the sidewalk?) Find the number of beats per second heard by the tourist. 5. A tuning fork with frequency f = 512 Hz is dropped from on top of a tower with a height of 200m. What is the frequency heard by person who dropped it, 5s later? 1...
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