Water flows through a 4.0-cm-diameler horizontal pipe ata speed uf 1.3 m/s. The pipe then narrows down to a diameter of 2.0 cm. Ignoring viscosity, what is the pressure difference between the wide and narrow sections of the pipe

Answer 1

figure the flow in the smaller pipe using the law of continuinty
Speed1*area1=Speed2*area2

then, having the two speeds, use bernouli's equation to find pressure.

Answer 2

4.2