(Solution) - Water flowing steadily through a 2 cm diameter pipe at -(2025 Original AI-Free Solution)

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Water flowing steadily through a 2 cm diameter pipe at 30 m/s goes through an expansion joint to flow through a 4 cm diameter pipe. Assuming the internal energy remains constant, determine
(a) The change in pressure as the water goes through the transition.
(b) Also determine the displacement of a mercury column in mm for this change in pressure. Assume water density to be 997 kg/m3.