A piece of wood is 0.600 m long, 0.250 m wide and 0.080 m thick. Its density is 600 kg/m3. What volume of iron (ρI = 7.8 x 103 kg/m3 ) should be fastened underneath it so the wood now floats in water (ρw = 1000 kg/m3 ) with its top even by the water level?