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A 0.33 kg pendulum bob is attached to a 1.2 m string. What is the change in the gravitational potential energy of the system as the bob swings

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  1. L = 1.2 meter
    m = 0.33 kg
    depends how far it swings
    if it swings at angle c from vertical
    rise from bottom = L (1 - cos c)
    so increase in Pe = m g h = m g L(1- cos c)
    if c is a small angle then cos c = 1 - c^2/2 ..... etc series...
    then
    Pe = m g L (c^2/2)
    I suspect you know how to get c(t) for a pendulum if you know the magnitude of the swing angle

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    Damon

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