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Damon - hey no fair :)
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No fair using the answer :) How far does the pendulum drop from the ten degrees? h = .510 (1 - cos 10) = 0.00775 meters drop so potential energy at top = m g h = m g (0.00775) 10 degrees * 2 pi radians/360 degrees = .1745 radians period = 1.44 s say theta
