Please quick help! A vertical rectangular object of uniform mass $M=10kg$ has sides $a=0,37m$ and $b=0,57m.$ It is pivoted from point $O$ as shown in the figure below. If a constant force of $F=91N,$ making an angle of $=37$ with diagonal is applied, determine the angular acceleration of the rectangle in $SI$ units at the instant shown. Express your answer using one decimal places. Please use the convention: Clockwise $(+),$ Counterclockwise $(-)$ when expressing your answer.

Hint $1$: The moment of inertia of a uniform disk about an axis of rotation passing through the center of mass $(CM)$ is $I_{CM}=\frac{1}{12}M(a^2+b^2).$

Hint $2$: Don't forget the force of gravity!!! Take $g=9\mathrm{.}80\frac{m}{s^2}.$