Suppose that a simple pendulum consists of a small 61 g bob, Ask an Expert

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Suppose that a simple pendulum consists of a small 61 g bob at the end of a cord of negligible mass. If the angle ? between the cord and the vertical is given by ? = (0.048 rad) cos[(7.7 rad/s) t + ?], what are

(a) the pendulum's length and

(b) its maximum kinetic energy?

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