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7. 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 lead must be fastened underneath it to sink the wood in calm water so that its top is just even with the water level? What is the mass of this volume of lead? (Ppb = 11.3 x 10 kg/m'; pwater = 1000 kg/m3). 8. A horizontal pipe 10.0 cm in diameter has a smooth reduction to a pipe 5.00 cm in diameter. If the pressure of the water in the larger pipe is 8.0x10* Pa and the pressure in the smaller pipe is 6.0x104 Pa, at what rate does water flow through the pipes