College Physics
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Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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At rest, a car’s horn sounds at a frequency of 550Hz. When the horn is sounded, while the car is moving down a street, a bicyclist moving at 8.50m/s in the direction opposite to the car hears a frequency of 575Hz. (a) What is the speed of the car? (b) If the cyclist slows down to 2.50m/s before passing the car, what is the new frequency detected by the cyclist? Assume that the car moves with the same speed, and that the speed of sound in air is 343m/s.
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- A fire truck is moving at 33 m/s, and a car in front of the truck is moving in the same direction at 43 m/s. If a 193-Hz siren blares from the truck, what frequency is heard by the driver of the car at v=343 m/s? No need to include the unit. Write your answer in whole numbers.arrow_forwardTwo trains approach each other, each train traveling at 26 m/s. The engineer on one train sounds his horn which has a frequency of 163Hz. What frequency does a passenger on the second train hear? Use 340 m/s for the speed of sound in airarrow_forwardone way to tell if a mosquito is about to sting is to listen for the doppler shift as the mosquito is flying. the buzzing sound of a mosquito's wings is emmitted at a frequency of 1050 Hz. If you hear a frequency of 1034Hz, does this mean thatthe mosquito is coming in for a landing or that it has just bitten you and is flying away? At what velocity is the mosquito flying?arrow_forward
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