A piece of wood is 0.700{\rm m} long, 0.210{\rm m} wide, and 8.00×10?2{\rm m} thick.
Part A Its density is 600{\rm kg/m^{3}} . What volume of lead must be fastened underneath it to sink the wood in calm water so that its top is just even with the water level?
(in m^3)
Part B What is the mass of this volume of lead?
(in Kg)