2. The angular acceleration of the disk is defined by a= 3t² + 12 rad/s, where t is inn seconds. If the disk is originally rotating at wo=12 rad/s, determine the magnitudes of the velocity and the n and t components of acceleration of point A on the disk when t= 2 s.

The slotted arm is pivoted at 0 and carries the slider C. The position of C in the slot is governed by the cord which is fastened at D and remains taut. The arn turns counterclockwise with a constant angular rate 8= 4 rad/sec during an interval of its motion. The length DBC of the cord equals R, which mnakes r - 0 when 8 =0. Determine the magnitude a of the acceleration of the slider at the position for which 8=30°. The distance R is 15 in. R. B.

= At the instant shown rod AB has an angular velocity WAB 4 rad/s and an angular acceleration AB 2 rad/s2. Determine the angular velocity and angular acceleration of rod CD at this instant. The collar at C is pin connected to CD and slides freely along AB. = a) using the relative motion analysis and the contact conditions. A 4 rad/s AB= 2 rad/s² WAB 60° 0 = 0.75 m -0.5 m В B D

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