A plate, 0.6 mm distance from a fixed plate, moves at 0.3 m/s and requires a force per unit area of 4 Pa to maintain this speed. Determine the viscosity of the substance between rhe two plates. If the...

A plate, 0.6 mm distance from a fixed plate, moves at 0.3 m/s and requires a force per unit area of 4 Pa to maintain this speed. Determine the viscosity of the substance between rhe two plates.

If the velocity distribution of a viscous liquid (µ, = 0.9 N-s/ ) over a fixed boundary is given by v = 0.68y -
 in which v is the velocity in m/s at a distance y (m) above the boundary surface. Determine the shear stress at the surface and at y = 0.34 m.