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(20%) Problem 1: You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a requency of f/ = 98 Hz. As the train recedes, you hear the whistle sound at a frequency of fo = 72 Hz. Take the speed of sound in air to be v = 340 m/'s. Randomized Variables 7 = 98 Hz f2 = 72 Hz A 25% Part (a) Find an equation for the speed of the sound source v,: in this case it is the speed of the train. Express your answer in terms of f1:f2, and v. Grade Summary V, = Deductions 0% Potential 100% B e ( 7 8 9 HOME Submissions a d f1 4 5 6 Attempts remaining: 7 (3% per attempt) g h 1 2 3 detailed view + 0 END P t V VO BACKSPACE CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: 2 Feedback: 1% deduction per feedback A 25% Part (b) Find the numeric value, in meters per second, for the speed of the train. A 25% Part (c) Find an equation for the frequency of the train whistle f, ("'s" is for "source") that you would hear if the train were not moving. Express our answer in terms off1:f2: and v. A 25% Part (d) Find the numeric value, in hertz, for the frequency of the train whistle f, that you would hear if the train were not moving.(20%) Problem 2: A bat flying toward a wall emits a 49000-Hz sonar pulse. The pulse is reflected back from the wall and the bat hears the reflected pulse at a frequency of (49000 + 520) Hz. Take the speed of sound to be 343 m/s. A Find the speed of the bat, in meters per second. Grade Summary Vbat Deductions 0% Potential 100% sin() cos() tan() 2 9 HOME Submissions cotan() asin() acos() E 4 5 Attempts remaining: 7 (3% per attempt) atan() acotan( sinh( 1 2 3 detailed view coshQ tanh() cotanh() END O Degrees O Radians VO BACKSPACE DEL CLEAR(20%) Problem 3: A bat, ying at 5.9 m-'s, pursues an insect that is flying at 1.6 int-'5 in the same direction. The bat emits a dlHz sonar pulse. Take the speed of sound to be 343 mfs. B3 a At what frequency, in hertz= does the bat heat the pulse reected bark from the insect? f= III Grade Summary Deductions 0; Potential Ill]!- Submissions Attempts remaining: ( per attempt) detailed View [20%) Pmblem 4: A blood ow meter emits a 2. FMI-[z ultrasound pulse to measure the speed of blood moving directly away from the meter. The meter sensor detects the pulse reected back from the blood at a frequency 31 Hz lower than the emitted frequency. Take the speed of sound in the tissues to be 1- mfs. E" a At What speed= in centimeters per second= is the blood moving? Grade Summary.r \"v 2 | I Deductions Potential 10' Submissions Attempts remainin ( per attempt] detailed View (20%) Problem 5: Ultrasound waves at intensities above 10# W/m- can do serious damage to living tissues. A If 10# W/m- corresponds to 160 dB, what is the sound intensity level, in decibels, of ultrasound with intensity 10' W/m-, used to pulverize ti surgery? Grade S B = Deduction Potential sin( cos() tan() 9 HOME Submissi cotan() asin( acoso) Attempts (3% per atan( acotan() sinh( 1 2 3 detailed cosh() tanh() cotanh() + END O Degrees O Radians VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up