(a) A block of wood in the shape of a cube, 5.0 cm on a side, is floating in water with its top face parallel to the surface of the water. With a ruler, you measure that the top of the block sticks out of the water by 1.5 cm. What is the density of that piece of wood?
(b) A block of aluminum weighs 2.00 N when hung from a spring scale in air. The block is then dipped into a beaker of oil so that the block is fully submerged, and the spring scale now reads 1.41 N. What is the density of the oil?