he pulmonary artery, which connects the heart to the lungs, has an inner radius of 2.60 mm and a length of 8.40 cm. If the drop in pressure between the heart and the lungs is 4.0 hPa. a) What is the average speed of the blood in the pulmonary artery?

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Variation of pressure

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