contestada

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

Respuesta :

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