Posted by lupe on Monday, January 11, 2010 at 10:06pm.
The water speed will drop by a factor 1/4 because of the larger pipe area. That follows from the incompressible fluid continuity equation, V * Area = constant. The water speed in the wider section is 3 m/s
Use the change in velocity and the Bernoulli equation to get the change in pressure.
P + (1/2)(density) V^2 = constant
P2 - P1 = (1/2)(water density)(V1^2 - V2^2
Solve for P2.
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