A wood is in a shape of rectangular parallelepiped with square as base is used as a buoy floating in salt water. A man weighing 70 kg stands still on the top of the buoy and it still floats with a period of vertical bobbing of 0.83 s. When the man moves away from the buoy, the period of bobbing becomes 0.69 s. Determine the dimensions, in meters, of the wood. For wood, SG =0.60& for salt water, SG=1.03. Assume that the wood will upright at all times.