Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN: 9781305116399
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 17, Problem 17.51AP
(a)
To determine
The frequency of the trucks that pass the cyclist.
(b)
To determine
The frequency of the trucks which passes the cyclist when the speed of cyclist is reduced to
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A boy is standing at a railroad crossing for a track that runs east and west. As he faces the track, east is to his right and west is to his left. Two trains on the track some distance apart are headed west, both at speeds of 8.20 m/s, and blowing their whistles (which have the same frequency). One train is approaching him from the east and the other is traveling away from him toward the west. (Assume the speed of sound is 343 m/s.)
(a)If he hears a beat frequency of 8.00 Hz, determine the frequency (in Hz) emitted by the two whistles.
(b)What If? What would be the frequency (in Hz) of the beats that he hears if the lead train stops at a station (and continues to blow its whistle) while the second train continues traveling toward him?
A train is moving parallel to a highway with a constant speed of 15.0 m/s. A car is traveling in thesame direction as the train with a speed of 20.0 m/s. The car horn sounds at a frequency of 480 Hz, and the train whistle sounds at a frequency of 330 Hz. (a) When the car is behind the train,what frequency does an occupant of the car observe for the train whistle? (b) After the carpasses and is in front of the train, what frequency does a train passenger observe for the carhorn?
A train is moving parallel and adjacent to a highway with a constant speed of 20.0 m/s. A car is
traveling in the same direction as the train at 40 m/s. The train's whistle sounds at 320 Hz. The speed of sound is
343 m/s. a) When the car is behind the train what frequency does an occupant of the car observe for the train
whistle? b) When the car is now in front of the train, what frequency does the car passenger hear?
Chapter 17 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
Ch. 17 - If you blow across the top of an empty soft-drink...Ch. 17 - A vibrating guitar string makes very little sound...Ch. 17 - Increasing the intensity of a sound by a factor of...Ch. 17 - Consider detectors of water waves at three...Ch. 17 - You stand on a platform at a train station and...Ch. 17 - An airplane flying with a constant velocity moves...Ch. 17 - Table 17.1 shows the speed of sound is typically...Ch. 17 - Prob. 17.2OQCh. 17 - As you travel down the highway in your car, an...Ch. 17 - What happens to a sound wave as it travels from...
Ch. 17 - A church bell in a steeple rings once. At 300 m in...Ch. 17 - If a 1.00-kHz sound source moves at a speed of...Ch. 17 - Prob. 17.7OQCh. 17 - Assume a change at the source of sound reduces the...Ch. 17 - A point source broadcasts sound into a uniform...Ch. 17 - Suppose an observer and a source of sound are both...Ch. 17 - Prob. 17.11OQCh. 17 - With a sensitive sound-level meter, you measure...Ch. 17 - Doubling the power output from a sound source...Ch. 17 - Of the following sounds, which one is most likely...Ch. 17 - How can an object move with respect to an observer...Ch. 17 - Older auto-focus cameras sent out a pulse of sound...Ch. 17 - A friend sitting in her cat far down the toad...Ch. 17 - How can you determine that the speed of sound is...Ch. 17 - Prob. 17.5CQCh. 17 - You are driving toward a cliff and honk your horn....Ch. 17 - The radar systems used by police to detect...Ch. 17 - The Tunguska event. On June 30, 1908, a meteor...Ch. 17 - A sonic ranger is a device that determines the...Ch. 17 - A sinusoidal sound wave moves through a medium and...Ch. 17 - As a certain sound wave travels through the air,...Ch. 17 - Write an expression that describes the pressure...Ch. 17 - An experimenter wishes to generate in air a sound...Ch. 17 - Calculate the pressure amplitude of a 2.00-kHz...Ch. 17 - Earthquakes at fault lines in the Earths crust...Ch. 17 - A dolphin (Fig. P17.7) in seawater at a...Ch. 17 - A sound wave propagates in air at 27C with...Ch. 17 - Ultrasound is used in medicine both for diagnostic...Ch. 17 - A sound wave in air has a pressure amplitude equal...Ch. 17 - Prob. 17.11PCh. 17 - A rescue plane flies horizontally at a constant...Ch. 17 - A flowerpot is knocked off a window ledge from a...Ch. 17 - In the arrangement shown in Figure P17.14. an...Ch. 17 - The speed of sound in air (in meters per second)...Ch. 17 - A sound wave moves down a cylinder as in Figure...Ch. 17 - A hammer strikes one end of a thick iron rail of...Ch. 17 - A cowboy stands on horizontal ground between two...Ch. 17 - Calculate the sound level (in decibels) of a sound...Ch. 17 - The area of a typical eardrum is about 5.00 X 10-5...Ch. 17 - The intensity of a sound wave at a fixed distance...Ch. 17 - The intensity of a sound wave at a fixed distance...Ch. 17 - Prob. 17.23PCh. 17 - The sound intensity at a distance of 16 in from a...Ch. 17 - The power output of a certain public-address...Ch. 17 - A sound wave from a police siren has an intensity...Ch. 17 - A train sounds its horn as it approaches an...Ch. 17 - As the people sing in church, the sound level...Ch. 17 - The most soaring vocal melody is in Johann...Ch. 17 - Show that the difference between decibel levels 1...Ch. 17 - A family ice show is held at an enclosed arena....Ch. 17 - Two small speakers emit sound waves of' different...Ch. 17 - A firework charge is detonated many meters above...Ch. 17 - A fireworks rocket explodes at a height of 100 m...Ch. 17 - Prob. 17.35PCh. 17 - Why is the following situation impossible? It is...Ch. 17 - An ambulance moving at 42 m/s sounds its siren...Ch. 17 - Prob. 17.38PCh. 17 - A driver travels northbound on a highway at a...Ch. 17 - Submarine A travels horizontally at 11.0 m/s...Ch. 17 - Review. A block with a speaker bolted to it is...Ch. 17 - Review. A block with a speaker bolted to it is...Ch. 17 - Expectant parents are thrilled to hear their...Ch. 17 - Why is the following situation impossible? At the...Ch. 17 - Prob. 17.45PCh. 17 - Prob. 17.46PCh. 17 - A supersonic jet traveling at Mach 3.00 at an...Ch. 17 - Prob. 17.48APCh. 17 - Some studies suggest that the upper frequency...Ch. 17 - Prob. 17.50APCh. 17 - Prob. 17.51APCh. 17 - Prob. 17.52APCh. 17 - Prob. 17.53APCh. 17 - A train whistle (f = 400 Hz) sounds higher or...Ch. 17 - An ultrasonic tape measure uses frequencies above...Ch. 17 - The tensile stress in a thick copper bar is 99.5%...Ch. 17 - Review. A 150-g glider moves at v1 = 2.30 m/s on...Ch. 17 - Consider the following wave function in SI units:...Ch. 17 - Prob. 17.59APCh. 17 - Prob. 17.60APCh. 17 - To measure her speed, a skydiver carries a buzzer...Ch. 17 - Prob. 17.62APCh. 17 - Prob. 17.63APCh. 17 - Prob. 17.64APCh. 17 - A police car is traveling east at 40.0 m/s along a...Ch. 17 - The speed of a one-dimensional compressional wave...Ch. 17 - Prob. 17.67APCh. 17 - Three metal rods are located relative to each...Ch. 17 - Prob. 17.69APCh. 17 - A siren mounted 011 the roof of a firehouse emits...Ch. 17 - Prob. 17.71CPCh. 17 - In Section 16.7, we derived the speed of sound in...Ch. 17 - Equation 16.40 states that at distance r away from...
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- An ambulance with a siren (f=1.00kHz) blaring is approaching an accident scene. The ambulance is moving at 70.00 mph. A nurse is approaching the scene from the opposite direction, running at vo=7.00 m/s. What frequency does the nurse observe? Assume the speed of sound is v=343.00 m/s.arrow_forwardA sound wave in air has a pressure amplitude equal to 4.00 103 Pa. Calculate the displacement amplitude of the wave at a frequency of 10.0 kHz.arrow_forwardA boat on the surface of the water suffers an explosion. Who hears the explosion first, a second boat 1 km away, or a whale swimming 4km deep directly under the boat? (βwater = 2.2 x 109 Pa, ρwater = 1000 kg/m3)arrow_forward
- an ambulance moving toward a person at 126 km/hr. The person is jogging towards the ambulance at 19 km/hr . The ambulance honks its horn, with a source frequency of 430Hz. To the left of the observer is a wall. The observer hears two sounds: the sound of the horn, and the echo of the horn that bounces off the wall. What beat frequency does the observer hear? (assume for this problem that the speed of sound is 340 m/s)arrow_forwardA train is moving parallel to a highway with a constant speed of 20 m/s. A car is traveling with a speed of 40.0 m/s. The car’s horn sound at a frequency of 510 Hz, and the train whistle sounds at a frequency of 320 Hz. When the car is behind the train, what frequency does an occupant of the car observe for the train whistle?arrow_forwardAn ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 220Hz. Each of the following cars is traveling down the road as described. Rank the cars according to the frequency the driver will hear. How fast does it seem the ambulance is moving towards or away from each driver? a. A car driving West at a speed of 25m/s. The car has already passed the ambulance. b. A car driving East at a speed of 20m/s. The car is behind the ambulance. c. A car driving West at a speed of 15m/s. The car is moving towards the ambulance.arrow_forward
- A train sounds a horn that vibrates at a frequency of 400Hz, as heard by the engineer aboard the train. What frequency does a passenger in a car hear for each of the following situations described? Speed of sound in air is 340m/s. All speeds are with respect to the ground. A. A car travels at a speed of 40m/s and is ahead of the moving train. Train moves at 20 m/s in the same direction as the car. B. The car travels at a speed of 40m/s and is behind the moving train but catching up. The train moves at 20m/s in the same direction as the car. C. The car travels at a speed of 40m/s in the opposite direction as the train and moves towards it. The train moves at 20m/s towards the car. D. The cara and the train have passed each other, going in opposite directions. The car travels at 40m/s and the train travels at 20 m/s, both moving away from each other. Thank you!arrow_forwardThe air pressure variations in a sound wave cause the eardrum to vibrate. A) Find the maximum velocity of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 Hz. m/s B) Find the maximum acceleration of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 Hz.in m/s^2 C) Find the maximum velocity of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 kHz. in m/s D) Find the maximum acceleration of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 kHz. m/s^2arrow_forwardA group of hikers hears an echo 1.40 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 341 m/s.)arrow_forward
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