College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 10 - Multiple-Choice Questions - Page 396: 9

Answer

The correct answer is: (c) Young's modulus and stress

Work Step by Step

Strain is $\frac{\Delta L}{L}$ so it has a dimensionless unit. However, Young's modulus, stress, and ultimate strength are not measured in dimensionless units, so the answer is not (a), (b), or (d). Young's modulus is measured in units of $Pa$ which can be expressed as $N/m^2$ Stress is a measure of the force per unit area so it is measured in units of $N/m^2$ The correct answer is: (c) Young's modulus and stress
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