1. The problem statement, all variables and given/known data I am having a hard time understanding the length measurement in the problem. We went over this example in class and the length, L, was something I didn't realize until now. Question: A 6-ft-long steam pipe is made of A-36 steel with σ=40 ksi (yield stress). It is connected directly to two turbines A and B as shown. The pipe has an outer diameter of 4 in. and a wall thickness of 0.25 in. The connection was made at T = 70°F. If the turbines’ points of attachment are assumed to have a stiffness of determine the force the pipe exerts on the turbines when the steam and thus the pipe reach a temperature of T2 =275°F. 2. Relevant equations δT = [itex]\alpha[/itex]*ΔT*L 3. The attempt at a solution I thought the equation would be: δT = 6.6(10-6)*(205°F)*(72 in.) But in my notes, it was: δT = 6.6(10-6)*(205°F)*(36 in.) Can someone explain why the length was 36 inches and not 72 inches? I was thinking that the length was chosen arbitrarily but I wasn't sure.