Answer
$\Delta$p=1809045 (N/$m^{2}$)
Work Step by Step
According to bernoulli's eqt:
p1 + $\frac{v1^{2}}{2}$ + $\theta$gh1 = p2 + $\frac{v2^{2}}{2}$ + $\theta$gh2
p1-p2= $\frac{9.5^{2}}{2}$ + 1000$\times$9.8$\times$180-$(\frac{0.4^{2}}{2}$ + 1000 $\times$9.8$\times$0)
p1-p2= 1809045 (N/$m^{2}$)
