University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 2, Problem 2.20E
BIO Blackout? A jet fighter pilot wishes to accelerate from rest at a constant acceleration of 5g to reach Mach 3 (three times the speed of sound) as quickly as possible. Experimental tests reveal that he will black out if this acceleration lasts for more than 5.0 s. Use 331 m/s for the speed of sound, (a) Will the period of acceleration last long enough to cause him to black out? (b) What is the greatest speed he can reach with an acceleration of 5g before he blacks out?
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Suppose you are watching the destruction of a bridge. The bridge is blown up and the sound of the explosion reaches you in 3.4 seconds. How far away from the bridge were you standing? Assume the speed of sound is 344 m/s for this question.
If a pilot accelerates at more than 4g (39.2 m/s2), he begins to “gray out,” but not completely lose consciousness. (a) What is the shortest time that a jet pilot starting from rest can take to reach Mach 4 (four times the speed of sound 1,324 m/s) without graying out? (b) How far would the plane travel during this period of acceleration? (c) Write the kinematics equations and sketch the graphs of velocity and position as a function of time.
A soccer player kicks a rock horizontally off a 32 m high cliff into a pool of water. If the player hears the sound of the splash 2.72 s later, what was the initial speed given to the rock (in m/s)?
Assume the speed of sound in air is 343 m/s.
m/s
What If? If the temperature near the cliff suddenly falls to 0°C, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to
hear the sound of the splash 2.72 s after kicking the rock?
m/s
Chapter 2 Solutions
University Physics (14th Edition)
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