8 A friend rides, in turn, the rims of three fast merry-go-rounds while 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 are given by the three curves in Fig. 17-29. Rank the curves according to (a) the linear speed v of the sound source, (b) the angular speeds o of the merry-go-rounds, and (c) the radii r of the merry-go-rounds, greatest first. 2-

8 A friend rides, in turn, the rims of three fast merry-go-rounds while 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 are given by the three curves in Fig. 17-29. Rank the curves according to (a) the linear speed v of the sound source, (b) the angular speeds o of the merry-go-rounds, and (c) the radii r of the merry-go-rounds, greatest first. 2-

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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M1 M2 .25 A uniform rope of mass m and length L hangs from a ceiling. (a) Show that the speed of a trans- verse wave on the rope is a function of y, the distance from the lower end, and is given by v = Vgy. (b) Show that the time a transverse wave takes to travel the length of the rope is given by t = 2VLIg. (6) Figure 16-36 Problem 24.
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21- a) An ambulance moving with a speed of V, m/s, produces a siren of frequency 416HZ, approaches an observer B, who is moving in the opposite direction with a speed of 26 m/s. If the frequency heard by the observer B is 656 Hz, and the speed of the sound is 342 m/s, calculate the A. Speed of the ambulance V, in m/s b) If now, the observer A is receding from the ambulance with the same speed as the observer B, calculate the Frequency of the sound heard by the observer A, in hertz:
66 Figure 16-44 shows the dis- placement y versus time t of the point on a string at x= 0, as a wave passes through that point. The scale of the y axis is set by y, = 6.0 mm. The wave is given by y(x, t) = ym sin(kx – wt + 4). What is 4? (Caution: A calculator does not always give the proper inverse trig function, so check your answer by substituting it and an assumed value of w into y(x, 1) and then plotting the function.) y (mm) Figure 16-44 Problem 66.
Approximately a third of people with normal hearing have ears that continuously emit a low-intensity sound outward through the ear canal. A person with such spontaneous otoacoustic emission is rarely aware of the sound, except perhaps in a noisefree environment, but occasionally the emission is loud enough to be heard by someone else nearby. In one observation, the sound wave had a frequency of 1665 Hz and a pressure amplitude of 1.13 *10-3 Pa. What were (a) the displacement amplitude and (b) the intensity of the wave emitted by the ear?
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A detector initially moves at constant velocity directly toward a stationary sound source and then (after passing it) directly from it.The emitted frequency is f. During the approach the detected frequency is f app and during the recession it is f rec. If the frequencies are related by (f app - f rec)/f = 0.500, what is the ratio vD/v of the speed of the detector to the speed of sound?
10.) see photo for details