How much the lengths of various substances change with temperature changes is given by their coefficients of linear expansion, a. The greater the value of a, the greater the change in length for a given change in temperature. Three kinds of metal wires, A, B, and C, are stretched between distant telephone poles. From greatest to least, rank the wires in how much they'll sag on a hot summer day.
a. Copper, a = 17 × 10-6/°C
b. Aluminum, a = 24 × 10-6/°C
c. Steel, a = 11 × 10-6/°C