The velocity of flow of water at the centre of tube is _______ when the head is 0.1m, η=8.9*10^-3 dynes-s/cm^2, γw=1 g/cm^3, the length is 10m and the diameter is 20cm.
(a) 20 cm/s
(b) 22 cm/s
(c) 28 cm/s
(d) 30 cm/s
The question was asked in final exam.
My doubt stems from Poiseuille’s Law topic in division Permeability of Geotechnical Engineering I