Question

A simple pendulum of length $\ell$ is displaced so that its taught string is horizontal and then released. A uniform bar pivoted at one end is simultaneously released from its horizontal position. If their motions are synchronous, what is the length of the bar?
(A) $\frac{3 \ell}{2}$
(B) $\ell$
(C) $2 \ell$
(D) $\frac{2 \ell}{3}$

Ans(A)

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