Graded HW#3 Ans: (a) 0.5657 in/s, 1.1328 in/s2 (b) 0.0549 rad/s CW, 0.10606 rad/s² CW. (a) A disk cam rotates about its pin connection O at the 9 o'clock position with the angular velocity and angular acceleration at the instant shown. Find the magnitude of the velocity and magnitude of the acceleration of point P at the 12 o'clock position at the instant. If you have trouble visualizing the correct circular motion, cut a disk from a piece of paper and pin down the left edge and turn around. P R=4" Hint: v is tangent to the path of P, not tangent to the shape of the object. What is the radius of the circular path of P? Does P circle around the disk center? Is the "radius" equal to R-4"? Of course not. Which point is the center of the circular motion? W=0.1 rad/s α=0.2 rad/s2 CW (b) The disk cam is controlled by the 5" slotted arm AB through a pin P fixed on the disk. If at the instant shown, 0=60°, =-0.1 rad/s, and = 0.2 rad/s², find the angular velocity @ and the angular acceleration a of the disk at the instant. O is at the 9 o'clock position P is at the 6 o'clock position. Hint: Again, vP is not tangent to the physical shape of the disk. The circular shape is a bait. 本 B R=4"