1. The problem statement, all variables and given/known data A 1.8- m long brass bar has a square cross section 1.3 cm on an edge. The bar is compressed by a force of 9.0×10^3 N applied to its ends. By how much does the bar shorten (in m)? 2. Relevant equations There is an example in our book explaining how to use a variation of Young's Modulus. ΔL = FL/YA 3. The attempt at a solution Change 1.3 cm into .013 m. (9.0x10^3 N)(1.8m) / (91 x 10^9 N/m^2)(.013^2) = .0011 m I squared .013 since it's the area squared.. and the 91 x 10^9 is the value for brass in the Elastic Moduli. Of course this is wrong, but not sure what I'm not doing quite right.