The pulmonary artery, which connects the heart to the lungs, has an inner radius of 2.80 mm and is 8.30 cm long. If the pressure drop between the heart and lungs is 420 Pa, what is the average speed of blood in the pulmonary artery? The viscosity of blood is 2.70 ✕ 10−3 Pa·s.

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.