Oil (ρ=800kgm−3) flows through a horizontal Venturi tube whose inlet diameter is 5cm and throat diameter is 2.5cm. A mercury manometer connected between these two points shows a level difference of 20cm. Take the density of mercury as 13600kgm−3 and g=9.8ms−2. What is the volume flow rate through the tube?
a) 8.9×10−3m3s−1
b) 2.8×10−3m3s−1
c) 4.0×10−3m3s−1
d) 1.6×10−2m3s−1