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The average speed of blood in the aorta (the main blood vesselcoming from the heart) is 0.300 m/s. The average radius of theaorta is 1.0 cm. The aorta branches into 2×109 capillaries(very small blood vessels) which each have an average radius of 6.0μm.

(a) What is the average speed of the blood in the capillaries?
(b) What is the mass flow rate of blood in a single capillary?

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