a) Calculate the mass flow rate (in grams per second) of blood (ρ = 1.0 g/cm ^{3}) in an aorta with a cross-sectional area of 2.0 cm^{2} if the flow speed is 40 cm/s.

b) Assume that the aorta branches to form a large number of capillaries with a combined cross-sectional area of 3.0 x 10^{3} cm^{2}. What is the flow speed in the capillaries?

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