College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Textbook Question
Chapter 11, Problem 8RQ
One end of a horizontal string of length L passes over a pulley with a block hanging at the end. A motor attached to the other end of the string exerts a constant horizontal force on the string. When the motor is turned on, it vibrates the end of the string up and down at frequencies that increase slowly from zero to a high frequency. What do you observe?
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An object of mass m can be hung from a rope (with linear mass density = 0.002 kg/m) that passes over a light pulley. The string is connected to a vibrator (which makes the string oscillate with a constant frequency f) and the length of the string between the point where the string is attached to the vibrator and the pulley is L = 2 m. When the mass of the object is m = 25 kg or m = 16 kg, standing waves are observed; however, no standing waves are observed with any other mass between these values, which means that they correspond to consecutive nodes, n and n + 1.a) What is the value of the tension of the string, FT, corresponding to each of the masses?b) In what harmonic does the string vibrate when the mass m = 25 kg is hung?
Categorize the scenarios according to whether the observer would detect the frequency to be higher, lower, or the same as the
actual frequency emitted by the source.
Higher
Lower
Same
Answer Bank
observer and source moving away from each other
source and observer moving towards each other
source moving towards stationary observer
source moving away from stationary observer
source and observer moving to the right with the same velocity
stationary source and observer
0.8 rad/s
Consider a place where the gravity is
one-fourth the gravity on Earth (g' =
g/4), then the frequency of oscillation
of a simple pendulum in that place, f',
as compared to its frequency on
earth is:
O f' = f/2
O f'= 4f
O f'= 2f
O f'= 9f
O f' = f/3
A traveling wave on a taut string with
a tension force T is given by the wave
function: y(x,t) = 0.1sin(2rtx-30ot),
where x and y are in meters and t is in
seconds The linear mass density of
Chapter 11 Solutions
College Physics
Ch. 11 - How do you produce a longitudinal wave on a...Ch. 11 - Compare and contrast the speed of a vibrating...Ch. 11 - Prob. 3RQCh. 11 - Prob. 4RQCh. 11 - Why is it impossible to create a traveling wave on...Ch. 11 - Your friend says that it is impossible for two...Ch. 11 - Is the following sentence true? When two...Ch. 11 - One end of a horizontal string of length L passes...Ch. 11 - When we studied traveling waves, we decided that...Ch. 11 - An ambulance siren blares continuously as the...
Ch. 11 - What does it mean if the speed of a wave is 300 m...Ch. 11 - 2. What does it mean if the wavelength of a wave...Ch. 11 - 3. If you wish to represent one period of a wave...Ch. 11 - 4. If you wish to graph the disturbance pattern of...Ch. 11 - Which mathematical expression represents a...Ch. 11 - Prob. 6MCQCh. 11 - Prob. 7MCQCh. 11 - 8. Figure Q11.8 shows the...Ch. 11 - Prob. 9MCQCh. 11 - Prob. 10CQCh. 11 - 11. Figure Q11.11 shows a snapshot of two pulses...Ch. 11 - 12. Can a wave have a period of 2.0 s, a speed of...Ch. 11 - 13. What physics ideas were necessary to construct...Ch. 11 - 14. How do you know that the wavelength of a wave...Ch. 11 - What conditions are necessary to create a...Ch. 11 - Invent and describe an experiment to estimate the...Ch. 11 - Prob. 17CQCh. 11 - 18. Describe two useful types of information a...Ch. 11 - 19. Two speakers hang from racks placed in an open...Ch. 11 - Two identical sound waves are sent down a long...Ch. 11 - Sound waves of all frequencies in the audio...Ch. 11 - How can you show that an object producing sound...Ch. 11 - Describe the common features and differences...Ch. 11 - 24. Why do different guitar strings sound...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Prob. 9PCh. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Assume that the speed of sound in air is 340 m/s...Ch. 11 - Prob. 14PCh. 11 - Telephone line A telephone lineman is told to...Ch. 11 - 16. * A pulse travels at speed v on a stretched...Ch. 11 - 17. A 0.62-kg Slinky has 185 coils. When you and...Ch. 11 - =100g/m and the middle section is made from rope...Ch. 11 - Show using a sketch and mathematics that the...Ch. 11 - Show using a sketch and mathematics that the...Ch. 11 - 22. * You are standing at position A and your...Ch. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - Prob. 26PCh. 11 - 27. Sound wave in Earth A sound wave created by an...Ch. 11 - A 5.0-kg rope that is 20 m long is woven to an...Ch. 11 - Prob. 29PCh. 11 - Repeat the previous problem for the case where the...Ch. 11 - Prob. 31PCh. 11 - 32. Two waves shown in Figure P11.32 at zero...Ch. 11 - Prob. 33PCh. 11 - 34. * Use Huygens' principle and a wave front...Ch. 11 - Prob. 35PCh. 11 - 36. * You have two synchronously vibrating objects...Ch. 11 - Design Describe an experiment to convince a friend...Ch. 11 - 38. The energy of a sound wave is proportional to...Ch. 11 - Prob. 39PCh. 11 - * Supersonic jet The sound intensity 5 km from the...Ch. 11 - * You are in an open field investigating how sound...Ch. 11 - One loudspeaker is producing a tone of frequency...Ch. 11 - 43. * Tovi is playing a flute and Dawn is playing...Ch. 11 - Music in music a very soft sound called...Ch. 11 - 45. Two sounds differ by 1 dB. What is the...Ch. 11 - 46. Calculate the change in intensity level when a...Ch. 11 - Prob. 47PCh. 11 - 48. Banjo fret How far from the end of the banjo...Ch. 11 - * Violin string A 0.33-m-long violin string has a...Ch. 11 - A person secures a 5.0-m-long rope of mass 0.40 kg...Ch. 11 - 51. * Laura and Elana are discussing how to solve...Ch. 11 - Prob. 52PCh. 11 - * Ratio reasoning By what percent does the...Ch. 11 - Prob. 54PCh. 11 - 55. * Brooklyn-Battery Tunnel The 2779-m...Ch. 11 - * Flute A wooden flute, open at both ends, is 0.48...Ch. 11 - Organ pipe The lowest three standing wave...Ch. 11 - The speed of sound can be measured using the...Ch. 11 - Prob. 59PCh. 11 - 60. * A rope of length L is attached to a...Ch. 11 - 61. * A 3.0-m-long rope with a mass of 100 g is...Ch. 11 - * A 1.2-m-long open-closed pipe is producing sound...Ch. 11 - * Figure P11.63 shows the spectrum of sound that...Ch. 11 - Prob. 64PCh. 11 - * See the spectrum in Figure P11.63. (a) Can this...Ch. 11 - Car horn A car horn vibrates at a frequency of 250...Ch. 11 - Train whistle A car drives at a speed of 25 m/s...Ch. 11 - 68. * BIO Speed of blood A source of ultrasound...Ch. 11 - 69. * Circular motion sound source A whistle with...Ch. 11 - BIO Bat echo A bat emits short pulses of sound at...Ch. 11 - 105 Hz emits sound waves and detects the same...Ch. 11 - * Violin strings The speed of a wave on a violin A...Ch. 11 - 73. * Use Huygens' principle and a wave front...Ch. 11 - Prob. 74GPCh. 11 - Prob. 75GPCh. 11 - s teammate shouts at her to catch a ball. Estimate...Ch. 11 - 77. ** EST While camping, you record a thunderclap...Ch. 11 - 78. ** BIO Blood speed A red blood cell travels at...Ch. 11 - Prob. 80RPPCh. 11 - 81. If the car from Problem 11.80 is moving at 20...Ch. 11 - 82. Which answer below is closest to the distance...Ch. 11 - Compare your answers to Problems 11.80 and 11.82....Ch. 11 - While your car from Problem 11.80 is stationary,...Ch. 11 - Prob. 85RPPCh. 11 - Prob. 86RPPCh. 11 - 87. What amplifies the air pressure in the ear?
a....Ch. 11 - Where is the mechanism that allows the ear to...Ch. 11 - Prob. 89RPPCh. 11 - The threshold for pressure variation of a barely...
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