Meriam, Kraige & Bolton — Plane Kinetics of Rigid Bodies: Problem 6_131

6/131 The mechanical tachometer measures the rotational speed $N$ of the shaft by the horizontal motion of the collar $B$ along the rotating shaft. This movement is caused by the centrifugal action of the two 12-oz weights $A$, which rotate with the shaft. Collar $C$ is fixed to the shaft. Determine the rotational speed $N$ of the shaft for a reading $\beta = 15^\circ$. The stiffness of the spring is 5 lb/in., and it is uncompressed when $\theta = 0$ and $\beta = 0$. Neglect the weights of the links.