If possible explain each step

The space between two $20-$in$.-$long concentric cylinders is filled with glycerin $($viscosity $=8\mathrm{.}5{10}^{-3}lb*\frac{s}{f}{t}^2).$ The inner cylinder has a

radius of $2in.$ and the gap width between cylinders is $0\mathrm{.}1in.$ Determine $($a$)$ the torque and $($b$)$ the power required to rotate the inner

cylinder at $180re\frac{v}{m}in.$ The outer cylinder is fixed. Assume the velocity distribution in the gap to be linear.

$($a$)$

$ft*{*}^{**}bb$

$($b$)$

$f{t}^{**}l\frac{b}{s}$