The coefficient of linear expansion of steel is 12 * 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to Summer?

0.012-m

Explanation:

∆L = α * Lo * (T-To)

α is the coefficient of linear expansion = 12 * 10-6 K-1

Lo = Initial length = 25-m

∆L = Change in length

(T-To) = 40 K

∆L = 12 * 10-6 * 25 * 40

∆L = 0.012-m