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24 May, 17:48

A 1.0 kg pendulum has an initial total energy of 10 J. Calculate the energy lost as heat if the pendulum is 0.10 m high and is traveling at 4.0 m/s.

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  1. 24 May, 18:09
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    Lost energy = 2J

    Explanation: Given that the

    Mass of the pendulum M = 1.0kg

    Initial energy E = 10J

    Height h = 0.1 m

    Speed V = 4 m/s

    Let us use conservation of energy to analyze the senero

    The maximum P. E at the initial position will be equal to maximum P. E for travelling down the hill

    I. e

    Total P. E = total K. E

    K. E = 1/2MV^2

    K. E = 1/2 * 1 * 4^2

    K. E = 8J

    Since P. E = K. E

    P. E = 8J

    But initially energy E = 10J

    Lost energy = P. E - E

    Lost energy = 10 - 8 = 2J
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