## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 15 - Think and Solve: 40

#### Answer

The equation given in the textbook says that the change in length $\Delta L$ of a material is given by $\Delta L = \alpha \Delta T$. This is incorrect. The correct equation is $\Delta L = L \cdot \alpha \cdot \Delta T$. $$\Delta L = L \cdot \alpha \cdot \Delta T = (1300 m)(\frac{11 \times 10^{-6}}{^{\circ}C})(20^{\circ} C) = 0.29 m$$

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