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In the normal region of an artery, the blood pressure is 100 mm Hg and the...

In the normal region of an artery, the blood pressure is 100 mm Hg and the flow speed is 0.12m/s. By what percentage would the pressure drop in this artery as the blood (density 1.05 x 10^3 kg/m^3) enters a region that has been narrowed by atherosclerotic plaque to a cross-sectional area one fifth of normal? Assume there is no change in elevation of artery and viscosity is negligible

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