1. The problem statement, all variables and given/known data Stack a steel beam on top of an aluminum beam. If you are given the Young's Modulus values (in psi) of each beam, try to predict the deflection of the "composite" beams. Please view the "Hint" my teacher gave me in the pdf attachment in this post. 2. Relevant equations Well, where do I go? I know the standard equation for deflection of a cantilever beam, but when you have a composite beam, what is the effective E and I values? (E= Young's Modulus and I = area moment of inertia) I can't quite tell how the spring thing even helps when all I am given are the Young's Modulus values of each beam? 3. The attempt at a solution Well, I am not asking so much for a solution as for what direction I ought to head.