College Physics
Wilson, College Physics, 6th Edition
Chapter 9
Exercises
MC = Multiple Choice Question, CQ = Conceptual Question, and IE = Integrated Exercise. Throughout the text, many exercise sections will include “paired” exercises. These exercise pairs, identified with red numbers, are intended to assist you in problem solving and learning. In a pair, the first exercise (even numbered) is worked out in the Study Guide so that you can consult it should you need assistance in solving it. The second exercise (odd numbered) is similar in nature, and its answer is given at the back of the book.
9.1 Solids and Elastic Moduli
Use as many significant figures as you need to show small changes.
1. MC The pressure on an elastic body is described by (a) a modulus, (b) work, (c) stress, (d) strain. (c)
2. MC Shear moduli are not zero for (a) solids, (b) liquids, (c) gases, (d) all of these. (a)
3. MC A relative measure of deformation is (a) a modulus, (b) work, (c) stress, (d) strain. (d)
4. MC The volume stress for the bulk modulus is (a) [pic] (b) [pic] (c) [pic] (d) [pic] (a)
5. CQ Which has a greater Young’s modulus, a steel wire or a rubber band? Explain. steel wire
6. CQ Why are scissors sometimes called shears? Is this a descriptive name in the physical sense? see ISM
7. CQ Ancient stonemasons sometimes split huge blocks of rock by inserting wooden pegs into holes drilled in the rock and then pouring water on the pegs. Can you explain the physics that underlies this technique? [Hint: Think about sponges and paper towels.] see ISM
8. ( A tennis racket has nylon strings. If one of the strings with a diameter of 1.0 mm is under a tension of 15 N, how much is it lengthened from its original length of 40 cm? 0.0015 m
9. ( Suppose you use the tip of one finger to support a 1.0-kg object. If your finger has a diameter of 2.0 cm, what is the stress on your finger? [pic]
10. ( A 5.0-m-long rod is stretched 0.10 m by a force. What is the strain in the rod? 0.020
Chapter 9
Exercises
MC = Multiple Choice Question, CQ = Conceptual Question, and IE = Integrated Exercise. Throughout the text, many exercise sections will include “paired” exercises. These exercise pairs, identified with red numbers, are intended to assist you in problem solving and learning. In a pair, the first exercise (even numbered) is worked out in the Study Guide so that you can consult it should you need assistance in solving it. The second exercise (odd numbered) is similar in nature, and its answer is given at the back of the book.
9.1 Solids and Elastic Moduli
Use as many significant figures as you need to show small changes.
1. MC The pressure on an elastic body is described by (a) a modulus, (b) work, (c) stress, (d) strain. (c)
2. MC Shear moduli are not zero for (a) solids, (b) liquids, (c) gases, (d) all of these. (a)
3. MC A relative measure of deformation is (a) a modulus, (b) work, (c) stress, (d) strain. (d)
4. MC The volume stress for the bulk modulus is (a) [pic] (b) [pic] (c) [pic] (d) [pic] (a)
5. CQ Which has a greater Young’s modulus, a steel wire or a rubber band? Explain. steel wire
6. CQ Why are scissors sometimes called shears? Is this a descriptive name in the physical sense? see ISM
7. CQ Ancient stonemasons sometimes split huge blocks of rock by inserting wooden pegs into holes drilled in the rock and then pouring water on the pegs. Can you explain the physics that underlies this technique? [Hint: Think about sponges and paper towels.] see ISM
8. ( A tennis racket has nylon strings. If one of the strings with a diameter of 1.0 mm is under a tension of 15 N, how much is it lengthened from its original length of 40 cm? 0.0015 m
9. ( Suppose you use the tip of one finger to support a 1.0-kg object. If your finger has a diameter of 2.0 cm, what is the stress on your finger? [pic]
10. ( A 5.0-m-long rod is stretched 0.10 m by a force. What is the strain in the rod? 0.020