1. The problem statement, all variables and given/known data The uniform rod shown has mass 6 kg and is attached to a spring of constant k = 820 N/m. End B of the rod is depressed 10 mm and released. Determine the period of vibration. Picture is attached below 2. Relevant equations Fs = kx W = mg 3. The attempt at a solution I honestly don't quite know how to even start a problem like this. Fs = (820 N/m)(0.010 m) = 8.2 N W = (6 kg)(9.81 N/kg) = 58.86 N The spring force will act on the right end of the bar and the weight will act in the middle (@400 mm). How am I supposed to proceed on this type of question? Do I need the torque about C?