$$ 

- A vertical rectangular object of uniform mass M = 10 kg has sides a = 0,31 m and b= 0, 49 m. It is pivoted from point O as shown in the figure below. If a constant force of F = 142 N, making an angle of 3 = 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 ICM = M(a +6). 12 Hint 2: Don't forget the force of gravity!!! Take g = 9.80 m/s. F a b CM 0