Thermal Energy and Thermodynamics killer?

Suppose that the 1.3-km main span of steel for the Golden Gate Bridge had no expansion joints. How much longer would it be for an increase in temperature of 15 degrees celsius?
(α = 24 x 10 -6/oC)?

Answer:
delta L = meters x alfa x delta T
delta L = 13000 m x 15 °C x 24 x 10^-6 = 4.68 m
the Golden Gate Bridge would be 13.00468 Km
24e-6*15*1.3km = 46.8cm

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