A pendulum is made of a bob dangling from a lightweight string of length (ell). The bob

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A pendulum is made of a bob dangling from a lightweight string of length \(\ell\). The bob is pulled sideways so that the string makes an angle \(\theta_{i}\) with respect to the vertical, then released. As it swings down, what is the rotational speed of the bob as a function of the changing angle \(\theta\) ?

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