1. The problem statement, all variables and given/known data There is a picture of two metal bars that are glued together of equal length (doesn't specify the type of metals). At 0 degrees C, they are not bent. At 20 degrees C, they are both equally bent (still attached together, bent the same way). Do they have the same or different thermal coefficients? 2. Relevant equations No equations really required for this question - it's conceptual. 3. The attempt at a solution My guess is that they have the same thermal coefficient. I just want to make sure. Thanks!