= 4. The disk Spins about arm with angular velocity of cos = 8 rad/sec and with angular acceleration of cos° 3 rad/sec² at the instant shown. If the shaft is rotating with constant speed of cop 6 rad/sec, determine the velocity and acceleration of point A located at the rim of the disk at this instant. = 158 -6 rad/s 0.5 ft- ,-8 rad/s -3 rad/s²