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Physics (5th Edition)
5th Edition
ISBN: 9780321976444
Author: James S. Walker
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 7PCE
A 0.5-kg object is acted on by a force whose x component varies with time as shown in Figure 5-26. Draw the corresponding ax-versus-time graph for this object.
Figure 5-26 Problem 7
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A swimmer has just jumped off a diving board. The swimmer has a mass of m = 56.4 kg and jumps off a board that is h = 7.15 m above the water. Exactly T = 4.1 seconds after entering the water, her downward motion is stopped.
a) Write an expression for the magnitude of the average upward force Fw exerted on her by the water in terms of the variables given in the problem statement and g (9.80 m/s2).
b) What is the magnitude of the average upward force Fw (in N) exerted on her by the water?
Problem 6: A4.8 • 105-kg rocket is accelerating straight up. Its engines produce 1.35 • 107 N of thrust, and air resistance is 4.7. 106 N.
Randomized Variables
m = 4.8. 105-kg
f=1.35.107 N
fr=4.7.106 N.
What is the rocket's acceleration, using a coordinate system where up is positive?
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DEL CLEAR
According to a simplified model of a mammalian heart, at each pulse approximately 20 g of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?
Chapter 5 Solutions
Physics (5th Edition)
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