Bundle: Principles of Physics: A Calculus-Based Text, 5th + WebAssign Printed Access Card for Serway/Jewett's Principles of Physics: A Calculus-Based Text, 5th Edition, Multi-Term
5th Edition
ISBN: 9781133422013
Author: Raymond A. Serway; John W. Jewett
Publisher: Cengage Learning
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Chapter 2, Problem 7OQ
A student at the top of a building of height h throws one ball upward with a speed of vi and then throws a second ball downward with the same initial speed vi. Just before it reaches the ground, is the final speed of the ball thrown upward (a) larger, (b) smaller, or (c) the same in magnitude, compared with the final speed of the ball thrown downward?
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An attacker at the base of a castle wall 3.75 m high throws a rock straight up with speed 7.50 m/s from a height of 1.60 m above the ground.
(a) Will the rock reach the top of the wall?
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(b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top?
m/s
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(c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.50 m/s and moving between the
same two points.
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(d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward
between the same elevations?
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No
(e) Explain physically why it does or does not agree.
A skier starts from rest from a height of 20 m and skis down the slope into a valley and back up a slope of 12 m high with respect to the valley. What speed does the skier have the moment he reaches the height of 12 m?
Sasha stands on the ground and tosses a baseball perfectly vertically up to her friend Helge, who catches it by reaching outside the window of his apartment building. She gives the ball an initial speed of vi= 19.7 m/s, and Helge catches it 1.40 s later when it reaches his hands. If Helge were to drop the baseball from rest at this point, what would be its final speed vf when it reaches Sasha’s hands down below? (She catches the ball at the same height from which she tossed it.)For your limit check, investigate what happens to vf as Sasha’s launch speed gets very large (i.e., as vi→∞).
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Chapter 2 Solutions
Bundle: Principles of Physics: A Calculus-Based Text, 5th + WebAssign Printed Access Card for Serway/Jewett's Principles of Physics: A Calculus-Based Text, 5th Edition, Multi-Term
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