If a 0.69 km (at -12°C ) section of straight railroad track made of steel is assumed to behave as a single piece, what is the difference in the length of the track between a cold winter day (-12°C) and a hot summer day (+38°C)? The coefficient of linear expansion (α) of steel is 1.2 × 10-5 °C-1. [1 km = 1,000 m]

At 20°C, a rod is exactly 20.05 cm long on a steel ruler. Both are placed in an oven at 270°C,  where the rod now measures 20.11 cm on the same ruler. What is the coefficient of linear  expansion for the material of which the rod is made?

The coefficient of linear expansion of the steel is 1.10 x10-5C°. If at a temperature of -15°C the length of the bridge (made with steel ) is 50.8 m then, what is a change in length if the temperature rises to 30°C? 1.784 mm 2.98 mm 2.51 cm 28.7 µm

A 175.0 km long electric power line made out of copper is installed during the Spring months at an average temperature of 10.9 °C. What is the change in the length of the power line on a hot Summer day, when the temperature is 41.9 °C? The coefficient of linear expansion for copper is 1.62×10-5 1/C°. Use positive sign for an increase in length and negative for a decrease. What is the change in the length of the cable on a -26.9 °C cold Winter day?