In the figure here, a cylinder having a mass of 3.9 kg can rotate about its central axis through point O. Forces are applied as shown: F1 = 8.8 N, F2 = 4.5 N, Fg = 3.8 N, and F4 = 1.2 N. Also, r = 3.4 cm and R = 15 cm. Taking the clockwise direction to be negative, find the angular acceleration of the cylinder. (During the rotation, the forces maintain their same angles relative to the cylinder.) F1 FA R Rotation axis Number Unit