1. The problem statement, all variables and given/known data The 20 cm-long wrench in the figure swings on its hook with a period of 0.92s. When the wrench hangs from a spring of spring constant 350 N/m, it stretches the spring 3.5 cm. What is the wrench's moment of inertia about the hook? http://session.masteringphysics.com/problemAsset/1070606/9/14.EX25.jpg 2. Relevant equations I = m*g*L*T^2/2pi 3. The attempt at a solution Fsp = Fg kx = mg m = kx/g m = (350)(0.035)/9.8 = 1.25 I = (1.25)(9.8)(0.14)(0.92)^2/2pi = 0.23 kg*m^2 This isn't the correct answer however. Can someone explain what I did wrong?