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 }
Chapter 2
Q. 2.9

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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.
