17.19. Identify: Apply L  L0 (1  T ) to the diameter D of the penny.
Set Up:
1 K  1 C°, so we can use temperatures in °C.
5
1
3
Execute: Death Valley:  D0T  (2.6 10 (C) )(1.90 cm)(28.0 C°)  1.4 10 cm, so the diameter is 1.9014
3
cm. Greenland:  D0T  3.6 10 cm, so the diameter is 1.8964 cm.
Evaluate: When T increases the diameter increases and when T decreases the diameter decreases.