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?

a. 1.2 cm

b. 1.8 cm

c. 1.4 cm

d. 2.0 cm

e. 1.6 cm

The answer to this question would be: a. 1.2 cm

In this question, the length of the bridge is 25m, the coefficient of linear expansion is 12 * 10^-6/K and the change of temperature is 40K. Then the calculation of the changes of the length would be:

25m * 12 * 10^-6/K * 40K = 12,000*10^-6m * 10^2 cm/m = 1.2cm