SOLVED 1. The problem statement, all variables and given/known data A bridge is made with segments of concrete 80 m long (at the original temperature). If the linear expansion coefficient is 1.2 x 10^-5 (1/degrees C), how much spacing is needed to allow for expansion for an increase in temperature of 50 degrees F? Answer in units of cm. 2. Relevant equations [tex]\Delta[/tex]L = [tex]\alpha[/tex] L(0) [tex]\Delta[/tex]T Degrees F = [(9/5) x Degrees C] + 32 3. The attempt at a solution This should be so simple... Degrees in C is simply (50-32) / (9/5) = 10 degrees C (This is delta T) Convert 80 meters to 8000 cm. So just plug and chug... [tex]\Delta[/tex]L = (1.2 x 10^-5) (8000) (10) = 0.96 cm If the bridge is composed of two segments, then each one will expand 0.96, so you would need 1.92 cm of space according to my work. But the solutions manual says the answer is 2.6667 cm. This has been driving me up the wall, any assistance would be appreciated.