Model the excavator’s arm ABC as a single rigid body. Its mass is 1200 kg, and the moment...

Model the excavator’s arm ABC as a single rigid body. Its mass is 1200 kg, and the moment of inertia about its center of mass is I = 3600 kg-m2. The angular velocity of the arm is zero and its angular acceleration is 1 rad/s2 counterclockwise. What force does the vertical hydraulic cylinder exert on the arm at B?