Water flows steadily through a horizontal circular nozzle, as shown in

the diagram, discharging to the atmosphere. At the nozzle inlet the

diameter is $D_1=0\mathrm{.}08m$ and at the nozzle outlet the diameter is $D_2$

$=0\mathrm{.}03m.$

The desired constant flow rate through the nozzle is $0\mathrm{.}003\frac{m^3}{s}.$

Calculate the inlet pressure.

Given: Water density $=1000k\frac{g}{m^3},$ Acmospheric pressure $=101,300$

$k\frac{g}{m}{s}^2)$

$[$Hint: Apply continuity equation and Bernoulli equation$]$