A rectangular block of wood weighs 8 N and has a density of 610 kg/mg. The block is placed into water (density = 1000 kg/mg). (a) What fraction of the volume of the block of wood is submerged? (b) A block of iron (density 6000 kg/ma) is placed on top of the wood such that 77% of the wood block is submerged. What is the weight of the iron block? N (0) Suppose now the iron block is attached to the bottom of the wood block. What fraction of the wood block is submerged now? (enter a decimal value)