Water is flowing in a 6-cm-diameter pipe at 4 m/s. It flows through a nozzle and exits to the atmosphere through a 2-cm-diameter exit area. The upstream pressure is nearest:

A) 750 kPa
B) 650 kPa
C) 550 kPa
D) 450 kPa


B) 650 kPa

This problem involves the flow of an incompressible liquid, namely water. The exiting velocity is

found using the continuity equation



The energy equation, using h = u + Pv, takes the form

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