Question

Liquid of specific gravity 0.90 flows in a horizontal tube 6.0 in diameter. In a section where the tube is constricted to 4.2 cm in diameter, the liquid pressure is less than that in the main tube by 16,000 dyn/cm

Answer 1

$$P=0.5\rho v^2\\1600=0.5(900)v^2\\v=1.9\frac{m}{s}$$