College Physics: A Strategic Approach (3rd Edition)

3rd Edition

ISBN: 9780321879721

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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Textbook Question

Chapter 4, Problem 69MSPP

If your car is stuck in the mud and you don't have a winch to pull it out, you can use a piece of rope and a tree to do the trick. First, you tie one end of the rope to your car and the other to a tree, then pull as hard as you can on the middle of the rope, as shown in Figure P4.68 a. This technique applies a force to the car much larger than the force that you can apply directly. To see why the car experiences such a large force, look at the forces acting on the center point of the rope, as shown in Figure P4.68 b. The sum of the forces is zero, thus the tension is much greater than the force you apply. It is this tension force that acts on the car and, with luck, pulls it free.

Chapter 4, Problem 69MSPP, If your car is stuck in the mud and you don't have a winch to pull it out, you can use a piece of

Figure P4.68

69. When you are pulling on the rope as shown, what is the approximate direction of the tension force on the tree?

A. North

B. South

C. East

D. West

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Chapter 4, Problem 68MSPP

Chapter 4, Problem 70MSPP

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Chapter 4 Solutions

College Physics: A Strategic Approach (3rd Edition)

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