Question 3 In a science competition, you are given a block of wood, of mass 4.0 kg and density 700 kg/m3. a) Predict what percentage of the block will stick out when the block oats in water. b) Challenge: For the science competition, you are required to load the block with lead metal (Pb, pronounced 'led') so that the wood block oats in water with 90 % of its volume submerged. What mass of lead do you need: 1. if the lead is on top of the wood? 2. if the lead is attached below the wood