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Question:
A small, square plank of oak floats in a beaker half full of water. The piece of oak is 7.3 cm on a side and 3.7 cm thick and floats on its side as shown in the figure below. http://www.webassign.net/giocp2/10-p-080.gif (a) Find the location of the plank’s center of mass with respect to the water’s surface. distance      mm     (b) A very light vegetable oil is poured slowly into the beaker so that the oil floats on the water without mixing and until the oak plank is a few centimeters below the surface of the oil. If the density of the oil is 660 kg/m 3 , what is the new position of the center of mass of the plank with respect to the water’s surface? distance      mm