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A solid disk of unknown radius R is initially at rotational rest. At t=0s, a constant force F=40N is applied to the disk rim causing a counterclockwise torque of 85Nm (see figure) about its axis o. Application of this torque causes the disk to increase its angular velocity at constant rate. If the disk's rotational kinetic energy at t=10.00 s is 640J, determine its angular acceleration (rad/s2). Give answer to three places to the right of the decimal