Two plates are separately by a H $=$ in$.$ space. The lower

plate is stationary; the upper plate moves at a velocity of

Vo $=10$ ft$/$s$.$ An oil with

u $=4\mathrm{.}4$ x $10-4$ ft$2/$s and SG $=0\mathrm{.}87),$

which fills the space between the plates, has the same

velocity as the plates at the surface of contact. The

variation in velocity of the oil can be considered as linear.

$(1)$ determine density and specific weight of the oil, $(2)$

determine the dynamic viscosity of the oil, $(3)$ What is the

shear stress in the oil.