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acero = > alfa = 11,5 * 10^-6 / °C
Lo = 100 m
Tf = 24°C
To = 8°C
=> ΔL = 11,5 *10 ^-6 / °C * 100m * (24 - 8)°C = 0,0184 m
Lf = Lo + ΔL = 100m + 0,0184m = 100,0184m
Respuesta: 100,0184
2) Hierro => alfa = 11,75 * 10^-6 / °C
=> ΔL = 11,75 * 10^-6 / °C * 50 m * (6 - 40)°C = 0,01998