1. The problem statement, all variables and given/known data A marble column with cross sectional area of 45cm^2 supports a load of 8.5 x 10^4 Newtons. The marble has a Young's modulus of 5.5 x 10^10 N/m^2 and a compressive strength of 1.8 x 10^8 Pa. If the column is 2.75m high, what is the change in length of the column? 2. Relevant equations Y(ΔL/L) = F/A Where Y is young modulus. 3. The attempt at a solution Y(ΔL/L) = F/A Solve the equation for ΔL and you get. ΔL = (FL)/ (AY) So plugging in the values you get. ΔL = ((8.5 x 10^4 N)(2.75m)) / ((.45m^2)(5.5 x 10^10 N/m^2)) So ΔL = 9.44 x 10^-6 Can someone double check me? I don't understand why my instructor gave me this number 1.8 x 10^8 Pa. Please confirm or deny my answer. Thanks very much.