A $33-$lb$,0\mathrm{.}8-$ft$-$diameter, $1-$ft$-$tall cylindrical tank slides slowly down a ramp with a constant speed of $0\mathrm{.}1f\frac{t}{s}$ as shown in the accompanying figure. The uniform$-$thickness oil layer on the ramp has a viscosity of $0\mathrm{.}21lb*\frac{s}{f}{t}^2.$ Determine the angle, $,$ of the ramp.

Round your answer to $2$ decimal places.

$=({)}_{}$