169) When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.

170) The hydraulic mean depth for a circular pipe of diameter (d) is

171) The tangential velocity of the water element having a free vortex is

172) The unit of kinematic viscosity in S. I. units is

173) A fluid whose viscosity does not change with the rate of deformation or shear strain is known as