A block of wood has a mass of 3.87 kg and a density of 584 kg/m3. It is to be loaded with lead so that it will float in water with 0.84 of its volume immersed. The density of lead is 1.13 104 kg/m3.
(a) What mass of lead is needed if the lead is on top of the wood?
(b) What mass of lead is needed if the lead is attached below the wood?