Question

A 7.0-cm-diameter horizontal pipe gradually narrows to 4.0 cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 32.0 kPa and 24.0 kPa , respectively.

What is the volume rate of flow? Express your answer using two significant figures.

Answer 1

According to  Bernoulli's Principle   

Since the Pipe is horizontal,      ...... Eqn (1)

According Continuity Equation,   

Substituting,      ( for water)

Eqn (1)   

  

Discharge,