University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 2.71P
A certain volcano on earth can eject rocks vertically to a maximum height H. (a) How high (in terms of H) would these rocks go if a volcano on Mars ejected them with the same initial velocity? The acceleration due to gravity on Mars is 3.71 m/s2; ignore air resistance on both planets, (b) If the rocks are in the air for a time T on earth, for how long (in terms of T) would they be in the air on Mars?
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(a) A soccer player kicks a rock horizontally off a 35 m high cliff into a pool of water. If the player hears the sound of the splash 2.84 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
(b) 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 2.84 s after kicking the rock?
m/s
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A certain volcano on the Earth can eject rocks vertically to a maximum height H. How high (in terms of H)
would these rocks go if a volcano on a planetary object ejected them with the same initial velocity? The
accelerations due to the gravity on the Earth and the planetary object are 9.8m/s² and 3.1 m/s?, respectively.
Neglect the effect of the air on both planets.
답:
(a) A soccer player kicks a rock horizontally off a 44 m high cliff into a pool of water. If the player hears the sound of the splash 3.19 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
(b) 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 3.19 s after kicking the rock?
m/s
Chapter 2 Solutions
University Physics (14th Edition)
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