A pendulum of mass 50 gm and length 90 cm is left to swing from an intial angle of 30 degrees, and seen to raise up to an angle of 28 degrees when it reaches the otherside. How much will it be in the difference in height? How much energy is lost?

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter12: Oscillatory Motion
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Problem 36P: Show that the time rate of change of mechanical energy for a damped, undriven oscillator is given by...
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A pendulum of mass 50 gm and length 90 cm is left to swing from an intial angle of 30 degrees, and seen to raise up to an angle of 28 degrees when it reaches the otherside. How much will it be in the difference in height? How much energy is lost?

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