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## Q. 2.9

Draw a FBD for the system of Figure 2.23(a) at an arbitrary instant using $\theta$ as the dependent variable and labeling the forces in terms of $\dot{\theta }$

## Verified Solution

The FBD is shown in Figure 2.23(b). The velocity of particle A at an arbitrary instant is $\frac{L}{4} \dot{\theta }$ upward, while the velocity of particle B is $\frac{3L}{4} \dot{\theta }$ downward.