A wooden cylinder floats upright in water, with $10\ \text{cm}$ of its length under the water, as shown in the figure. It is pushed down a little and released, so it bobs up and down. Ignoring the drag of the water and taking $g = 10\ \text{m/s}^2$, the period of this motion is closest to

Fig. 1: A wooden cylinder floating upright in water, with 10 cm of it under the water.