Chapter 12.8, Problem 35FP

Peg P is driven by the fork link OA along the curved path described by $r=\text{ (2}\theta \text{)}$ ft. At the instant $\theta$= $\pi /4$ rad, the angular velocity and angular acceleration of the link are $\stackrel{\dot{}}{\theta }$ = 3 rad/s and $\ddot{\theta }$ = 1 rad / ${\text{s}}^2.$ Determine the magnitude of the peg’s acceleration at this instant.