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How exactly does the heights give me the pressure? I though pressure=F/Area? And also is the velocity constant for the entire pipe?

Homework Statement The inside diameters of the larger portions of the horizontal pipe in Figure P9.40 are 2.80 cm. Water flows to the right at a rate of 2.00 10-4 m3/s. Determine the inside diameter of the constriction. Answer in (cm) Here is the picture...