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Chapter 17: Q56P (page 509)
An ambulance with a siren emitting a whine at 1600Hzovertakes and passes a cyclist pedaling a bike at 2.44m/s. After being passed, the cyclist hears a frequency of 1590Hz. How fast is the ambulance moving?
The ambulance is moving at 4.61m/s
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Question: A friend rides, in turn, the rims of three fast merry-go-roundswhile holding a sound source that emits isotropically at a certain frequency. You stand far from each merry-go-round. The frequency you hear for each of your friend’s three rides varies as the merry-go-round rotates. The variations in frequency for the three rides aregiven by the three curves in Fig. 17-29. Rank the curves according to:
(a) the linear speed vof the sound source, (b) the angular speedsvofthe merry-go-rounds, and (c) the radii rof the merry-go-rounds, greatest first
Two identical piano wires have a fundamental frequency of 600Hzwhen kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 6.0beats/s when both wires oscillate simultaneously?
The average density of Earth’s crust beneath the continents is . The speed of longitudinal seismic waves at that depth, found by timing their arrival from distant earthquakes, is role="math" localid="1661499978175" . Use this information to find the bulk modulus of Earth’s crust at that depth. For comparison, the bulk modulus of steel is about role="math" localid="1661499995851" .
Question: In Fig. 17-27, pipe Ais made to oscillate in its third harmonicby a small internal sound source. Sound emitted at the right endhappens to resonate four nearby pipes, each with only one openend (they are notdrawn to scale). Pipe Boscillates in its lowestharmonic, pipe Cin its second lowest harmonic, pipe Din itsthird lowest harmonic, and pipe Ein its fourth lowest harmonic.Without computation, rank all five pipes according to theirlength, greatest first. (Hint:Draw the standing waves to scale andthen draw the pipes to scale.)
The A string of a violin is a little too tightly stretched. Beats at 4.00 per second are heard when the string is sounded together with a tuning fork that is oscillating accurately at concert A (440Hz).What is the period of the violin string oscillation?
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