1. The problem statement, all variables and given/known data An angler hangs a 5.50 kg fish from a vertical steel wire 1.30 m long and 4.32×10^-3 cm in cross-sectional area. The upper end of the wire is securely fastened to a support. Calculate the amount the wire is stretched by the hanging fish. (I found this to be 8.11x10-4 m) The angler now applies a force F to the fish, pulling it very slowly downward by 0.569mm from its equilibrium position. For this downward motion, calculate the work done by gravity. (I found this to be 3.07x10^-2 J) For this downward motion, calculate the work done by the force F. 2. Relevant equations E=FL_0/A_0ΔL W=Fd My prof reccomended using: k=EA_0/L_0 and W=0.5kx^2 3. The attempt at a solution Using Young's Modulus, F=EA_0ΔL/L_0 F=(2x10^11 N/m)(4.32x10^-7 m ^2)/(1.300811 m) Solving for F=37.8 N W=Fd W=(37.8 N)(0.000569 m) W=2.2x10^-2 J Then I emailed my prof and he said to do it like this: k=EA_0/L_0 k=(2x10^11 N/m)(4.32x10^-7 m^2)/(1.300811 m) k=66420 N/m W=0.5kx^2 W=(0.5)(66420 N/m)(0.000569 m)^2 W=1.08x10^-2 J According to Mastering Physics, both of these answers are wrong. Please Help!