By how much will a slab of concrete 18m long contract when the temperature drops from 24 degrees C to -16 degrees C. (the coefficent of linear thermal expansion for concrete is 12*10^-6 per degree C.)
a. 0.86 cm
b. 0.52 cm
c. 8.6 cm
d. 0.17 cm
In six lines of explanation and computation, the problem is solved.