A spring with spring constant 35 N/m is attached to the ceiling,  and a 5.0-cm-diameter, 1.0 kg metal cylinder is attached to its lower  end. The cylinder is held so that the spring is neither stretched nor  compressed, then a tank of water is placed underneath with the  surface of the water just touching the bottom of the cylinder. When  released, the cylinder will oscillate a few times but, damped by the  water, quickly reach an equilibrium position. When in equilibrium,  what length of the cylinder is submerged?