A piece of wood is 0.640m long, 0.230m wide, and 7.00×10^?2 m thick.
A. Its density is 600 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?
V=_______m^3
B. What is the mass of this volume of lead?
m=_______kg