in fig. 10-42, a cylinder having a mass of 2.0 kg can rotate about its central axis through point 0. forces are applied as shown: f1 i 6.0 n, f; i 4.0 n, f3 i 2.0 n, and f4 i 5.0 n. also, r i 5.0 cm and r i 12 cm. find the (a) magnitude and (b) direction of the an gular acceleration of the cylinder. (during the rotation, the forces maintain their same angles relative to the cylinder.)