1. The problem statement, all variables and given/known data Suppose the ends of a 20-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 30 cm^2. What force does the beam exert when it is heated to 40°C? ( αsteel = 1.1 × 10−5/C°, Ysteel = 2.0 × 1011 N/m2). 2. Relevant equations delta L =alpha Li delta T 3. The attempt at a solution I solve for the new lenght and get 20.0088m. I dont know what Ysteel is used for or were to start after finding the new lenght.