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2. Problem 4.9A patent is being examined by echocardiography for possible mitral valve stenosis. The left atrail velocity averaged 0.5 m/s while the valve was open. The maximum velocity through the valve was 1.8 m/s. The cross-sectional diameter in the left atrium where the velocity was recorded was 1.5 cm. (a) Determine the pressure drop between the left atrium and the valve.