A Newtonian oil with a density of 60 lbm/ft3, viscosity of 0.206 103 lbm/ft-s and kinemati...

A Newtonian oil with a density of 60 lbm/ft3, viscosity of 0.206 103 lbm/ft-s and kinematic viscosity of 0.342 × 105 ft2/s undergoes steady shear between a horizontal fixed lower plate and a moving horizontal upper plate. The upper plate is moving with a velocity of 3 ft/s. The distance between the plates is 0.03 in., and the area of the upper plate in contact with the fluid is 0.1 ft2. Assume incompressible, isothermal, inviscid, frictionless flow.

a. What is shear stress exerted on the fluid under these conditions?

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b. What is the force of the upper plate on the fluid?