Explanation 1) Concept: We know the height from which the block is falling, and its mass is also known. Now as the block is under free fall, the potential energy will be converted into kinetic energy when the block falls on the ground. From this, we can find the kinetic energy of the block just before it landed. We are given enough information to find the area of the body wave, and we know the power required to develop these waves. Using the formula for intensity of the wave, we can find the intensity of the body wave. A similar procedure has to be used to find the intensity of the surface waves. 2) Formula: i) I = P A ii) P = K i n e t i c E n e r g y ∆ t iii) P E = m g h 3) Given: i) Mass of the block varies between 7.9 × 10 7 k g < m < 1.7 × 10 8 k g ii) Height from which the block is dropped h = 500 m iii) Impact lasted for ∆ t = 0.5 s iv) Depth of vertical cylinder d = 5.0 m v) r = 200 k m 4) Calculation: a) As the block is falling from a certain height and no other forces are acting on it, according to conservation of energy, potential energy at that height will be converted into kinetic energy just before it comes to rest. P E = K E K E = m g h We take, m = 7.3 × 10 7 k g K E = 7.3 × 10 7 × 9.8 × 500 K E = 3.6 × 10 11 J We take, m = 1.7 × 10 8 k g K E = 1.7 × 10 8 × 9.8 × 500 K E = 8.3 × 10 11 J So, the range of the kinetic energy will be from 3.6 × 10 11 J to 8.3 × 10 11 J . b) Now 20 % of the kinetic energy is converted into the seismic wave. When K E = 3.6 × 10 11 J K E w a v e = 20 100 × 3.6 × 10 11 K E w a v e = 0.72 × 10 11 J Intensity of the body wave I b o d y = P A b o d y Now, we have P = K E w a v e ∆ t P = 0.72 × 10 11 0.5 P = 1.44 × 10 11 W A b o d y = 1 2 × 4 π r 2 A b o d y = 2 π × 200 × 10 3 2 A b o d y = 2.5 × 10 11 m 2 I b o d y = 1.44 × 10 11 2.5 × 10 11 I b o d y = 0.58 W / m 2 When K E = 8.3 × 10 11 J K E w a v e = 20 100 × 8.3 × 10 11 K E w a v e = 1.66 × 10 10 J P = K E w a v e ∆ t P = 1.66 × 10 11 0.5 P = 3.32 × 10 11 W A b o d y = 1 2 × 4 π r 2 A b o d y = 2 π × 200 × 10 3 2 A b o d y = 2

11th Edition

ISBN: 9781119455608

Author: Halliday

Publisher: WILEY

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.

Question

Chapter 17, Problem 94P

To determine

To find:

a) Estimate the block’s kinetic energy just before it comes to land

b) Intensity of the body wave

c) Intensity of the surface wave when they reach the seismograph 200 km away

d) Which wave is detected on the distant seismograph – the body wave or the surface wave

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Chapter 17, Problem 93P

Chapter 17, Problem 95P

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Chapter 17 Solutions

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Ch. 17 - Prob. 1Q Ch. 17 - In Fig. 17-25, two point sources S1, and S2, which...Ch. 17 - In Fig. 17-26, three long tubes A,B, and C are...Ch. 17 - Prob. 4Q Ch. 17 - In Fig. 17-27, pipe A is made to oscillate in its...Ch. 17 - Prob. 6Q Ch. 17 - Figure 17-28 shows a moving sound source S that...Ch. 17 - Prob. 8Q Ch. 17 - For a particular tube, here are four of the six...Ch. 17 - Prob. 10Q

Ch. 17 - You are given four tuning forks. The fork with the...Ch. 17 - Two spectators at a soccer game see, and a moment...Ch. 17 - What is the bulk modulus of oxygen if 32.0 g of...Ch. 17 - Prob. 3P Ch. 17 - A column of soldiers, marching at 120 paces per...Ch. 17 - Prob. 5P Ch. 17 - A man strikes one end of a thin rod with a hammer....Ch. 17 - SSM WWW A stone is dropped into a well. The splash...Ch. 17 - Prob. 8P Ch. 17 - If the form of a sound wave traveling through air...Ch. 17 - Prob. 10P Ch. 17 - SSM Diagnostic ultrasound of frequency 4.50 MHz is...Ch. 17 - The pressure in a traveling sound wave is given by...Ch. 17 - A sound wave of the form s = sm coskx t travels...Ch. 17 - Figure 17-32 shows the output from a pressure...Ch. 17 - GO A handclap on stage in an amphitheater sends...Ch. 17 - Two sound waves, from two different sources with...Ch. 17 - Prob. 17P Ch. 17 - Prob. 18P Ch. 17 - GO Figure 17-35 shows two isotropic point sources...Ch. 17 - Figure 17-36 shows four isotropic point sources of...Ch. 17 - SSM In Fig. 17-37, two speakers separated by...Ch. 17 - In Fig. 17-38, sound with a 40.0 cm wavelength...Ch. 17 - GO Figure 17-39 shows two point sources S1 and S2...Ch. 17 - Suppose that the sound level of a conversation is...Ch. 17 - A sound wave of frequency 300Hz has an intensity...Ch. 17 - Prob. 26P Ch. 17 - SSM WWW A certain sound source is increased in...Ch. 17 - Two sounds differ in sound level by 1.00 dB. What...Ch. 17 - Prob. 29P Ch. 17 - The source of a sound wave has a power of 1.00 W....Ch. 17 - GO When you crack a knuckle, you suddenly widen...Ch. 17 - Approximately a third of people with normal...Ch. 17 - Male Rana catesbeiana bullfrogs arc known for...Ch. 17 - GO Two atmospheric sound sources A and B emit...Ch. 17 - A point source emits 30.0 W of sound...Ch. 17 - Party hearing. As the number of people at a party...Ch. 17 - Prob. 37P Ch. 17 - The water level in a vertical glass tube 1.00 m...Ch. 17 - Prob. 39P Ch. 17 - Organ pipe A, with both ends open, has a...Ch. 17 - A violin siring 15.0 cm long and fixed at both...Ch. 17 - A sound wave in a fluid medium is reflected at a...Ch. 17 - SSM In Fig. 17-41, S is a small loudspeaker driven...Ch. 17 - The crest of a Parasaurolophus dinosaur skull is...Ch. 17 - In pipe A, the ratio of a particular harmonic...Ch. 17 - GO Pipe A. which is 1.20 m long and open at both...Ch. 17 - A well with vertical sides and water at the bottom...Ch. 17 - One of the harmonic frequencies of tube A with two...Ch. 17 - SSM A violin string 30.0 cm long with linear...Ch. 17 - Prob. 50P Ch. 17 - The A string of a violin is a little too tightly...Ch. 17 - A tuning fork of unknown frequency makes 3.00...Ch. 17 - SSM Two identical piano wires have a fundamental...Ch. 17 - You have five tuning forks that oscillate at close...Ch. 17 - Prob. 55P Ch. 17 - An ambulance with a siren emitting a whine at 1600...Ch. 17 - A state trooper chases a speeder along a straight...Ch. 17 - Prob. 58P Ch. 17 - GO In Fig. 17-42, a French submarine and a U.S....Ch. 17 - A stationary motion detector sends sound waves of...Ch. 17 - GO A bat is flitting about in a cave, navigating...Ch. 17 - Figure 17-43 shows four tubes with lengths 1.0 m...Ch. 17 - ILWAn acoustic burglar alarm consists of a source...Ch. 17 - A stationary detector measures the frequency of a...Ch. 17 - GO A 2000 Hz siren and a civil defense official...Ch. 17 - GO Two trains are traveling toward each other at...Ch. 17 - SSM WWWA girl is sitting near the open window of a...Ch. 17 - Prob. 68P Ch. 17 - SSMA jet plane passes over you at a height of 5000...Ch. 17 - A plane flies at 1.25 times the speed of sound....Ch. 17 - At a distance of 10 km, a 100 Hz horn, assumed to...Ch. 17 - A bullet is fired with a speed of 685 m/s. Find...Ch. 17 - Prob. 73P Ch. 17 - The average density of Earths crust 10 km beneath...Ch. 17 - A certain loudspeaker system emits sound...Ch. 17 - Find the ratios greater to smaller of the a...Ch. 17 - Prob. 77P Ch. 17 - A trumpet player on a moving railroad flatcar...Ch. 17 - GO In Fig. 17-46, sound of wavelength 0.850 m is...Ch. 17 - GO A detector initially moves at constant velocity...Ch. 17 - SSMa If two sound waves, one in air and one in...Ch. 17 - A continuous sinusoidal longitudinal wave is sent...Ch. 17 - SSMUltrasound, which consists of sound waves with...Ch. 17 - The speed of sound in a certain metal is vm. One...Ch. 17 - An avalanche of sand along some rare desert sand...Ch. 17 - A sound source moves along an x axis, between...Ch. 17 - SSMA siren emitting a sound of frequency 1000 Hz...Ch. 17 - Prob. 88P Ch. 17 - Prob. 89P Ch. 17 - Prob. 90P Ch. 17 - Prob. 91P Ch. 17 - You can estimate your distance from a lightning...Ch. 17 - SSMFigure 17-48 shows an air-filled, acoustic...Ch. 17 - Prob. 94P Ch. 17 - SSMThe sound intensity is 0.0080 W/m2 at a...Ch. 17 - Four sound waves are to be sent through the same...Ch. 17 - Prob. 97P Ch. 17 - A point source that is stationary on an x axis...Ch. 17 - You are standing at a distance D from an isotropic...Ch. 17 - Pipe A has only one open end; pipe B is four times...Ch. 17 - A pipe 0.60 m long and closed at one end is filled...Ch. 17 - A sound wave travels out uniformly in all...Ch. 17 - A police car is chasing a speeding Porsche 911....Ch. 17 - Prob. 104P Ch. 17 - In Fig. 17-35. S1 and S2 are two isotropic point...Ch. 17 - Prob. 106P Ch. 17 - Kundts method for measuring the speed of sound. In...Ch. 17 - Prob. 108P Ch. 17 - In Fig. 17-53, a point source S of sound waves...Ch. 17 - A person on a railroad car blows a trumpet note at...Ch. 17 - A listener at rest with respect to the air and the...

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a) Estimate the block’s kinetic energy just before it comes to land b) Intensity of the body wave c) Intensity of the surface wave when they reach the seismograph 200 km away d) Which wave is detected on the distant seismograph – the body wave or the surface wave

Solution Summary: The author explains how the block's kinetic energy is estimated before it comes to land, and the intensity of the body and surface waves.

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To find: a) Estimate the block’s kinetic energy just before it comes to land b) Intensity of the body wave c) Intensity of the surface wave when they reach the seismograph 200 km away d) Which wave is detected on the distant seismograph – the body wave or the surface wave

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Chapter 17 Solutions

To find:

a) Estimate the block’s kinetic energy just before it comes to land

b) Intensity of the body wave

c) Intensity of the surface wave when they reach the seismograph 200 km away

d) Which wave is detected on the distant seismograph – the body wave or the surface wave