*81. CD A car is parked 20.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, headed directly east at a speed of 55.0 m/s. The train sounds a short blast of its 289-Hz horn when it reaches a point 20.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the train's velocity that is directed toward the car affects the frequency heard by the driver.)

*81. CD A car is parked 20.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, headed directly east at a speed of 55.0 m/s. The train sounds a short blast of its 289-Hz horn when it reaches a point 20.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the train's velocity that is directed toward the car affects the frequency heard by the driver.)

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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2. H.W: What is value of the frequency that can be received by a person before he/she was hit by a car traveling with speed of 25 m/s and producing a horn with frequency of 3500 Hz? Assume that the speed of sound is 331 m/s. (key-answer, 3.79 x 10³).
*108. D A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 350. When a jet aircraft is taking off, the sound intensity level experienced by the crew member is 88 dB. What sound intensity level would the crew member experience if he removed the protective earplugs?
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*48. CD Consult Multiple-Concept Example 4 in order to review a model for solving this type of problem. Suppose that you are standing by the side of a road in the Sahara desert where the temperature has reached a hot 56 °C (130 °F). A truck, traveling at a constant speed, passes by. After 4.00 s have elapsed, you use the ultrasonic ruler discussed in Example 4 to measure the distance to the truck. A sound pulse leaves the ultrasonic ruler and returns 0.120 s later. Assume that the average molecular mass of air is 28.9 u, air is an ideal diatomic gas (y = }), and the truck moves a negligible distance in the time it takes for the sound pulse to reach it. Determine how fast the truck is moving.
how would you do this as isn't the ambulance the source of the sound? this is a non graded practice worksheet
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37 An ambulance travels down a highway at a speed of 75.0 mi/h, its siren emitting sound at al frequency of 400 Hz. What frequency is heard by a passenger in a car traveling at 55.0 mi/h in the opposite direction as the car and ambulance pass and move away from each other? Take the speed of sound in air to be 343 m/s 475 Hz 425.2 Hz 397.5 Hz 338.3 Hz
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Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, the first one emitting a frequency of 2500 Hz and the second one emitting a frequency of 3800 Hz. What frequencies (in Hz) do they receive if the speed of sound is 330 m/s? first eagle Hz second eagle Hz Additional Materials O Reading
1 A train approaching a hill at a speed of 40 km/hr sound a whistle of frequency 580HZ when it is at a distance of 1 km from the hill. A wind with a speed of 40 km per hour is blowing in the direction of motion of the train. Find: (a) Frequency of whistle as heard by an observer on the hill.
Caitlin is out in her speedboat on the lake with her friends Peter and Selvana in a dense fog even though she knows better. Her friends convince her that the jumping rocks are worth it. She approaches a large jumping cliff. Because she is a master physics student, Caitlin assumes the speed of sound to be 343 m/s. How far away from the cliff is her boat? a) 4.1 m Ob) 344 m Oc) 2.4 m d) 412 m