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30 October, 00:20

What energy change would accompany the loss of 0.1 mg in mass? Express the energy change in kilojoules to one significant digit.

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  1. 30 October, 00:40
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    9 x 10^6 J

    Explanation:

    mass, m = 0.1 mg = 0.1 x 10^-6 kg

    According to the mass energy equivalence

    E = mc²

    where, c is the velocity of light

    c = 3 x 10^8 m/s

    E = 0.1 x 10^-6 x 3 x 10^8 x 3 x 10^8

    E = 9 x 10^9 J

    E = 9 x 10^6 kJ

    Thus, the energy is 9 x 10^6 J.
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