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]

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