Water at $40C$ flows steadily from a large open tank and discharges to atmosphere through

a pipe $(D=150mm),$ as shown in the figure $($below$).$ If the barometric $($absolute$)$ pressure

is $96\mathrm{.}5$kPa, determine the diameter, $d,$ in the narrowed section of pipe which can be

expected to cause incipient cavitation $($at the throat of the constriction$).$