The Coefficient of Linear Expansion of Steel Is 12 ×

Multiple Choice

The coefficient of linear expansion of steel is 12 × 10^-6/C°. A railroad track is made of individual rails of steel 1.0 km in length. By what length would these rails change between a cold day when the temperature is -10 °C and a hot day at 30 °C?

A) 0.62 cm
B) 24 cm
C) 48 cm
D) 480 cm
E) 620 cm