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11 November, 07:29

A system initially has an internal energy U of 504 J. It undergoes a process during which it releases 111 J of heat energy to the surroundings, and does work of 222 J. What is the final energy of the system, in J?

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  1. 11 November, 07:58
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    615 J

    Explanation:

    internal energy (U) = 504 J

    heat lost (q) = 111 J = - 111 J (negative sign is because heat is lost)

    work done = 222 J

    what is the final energy in the system

    total energy = final energy - initial energy

    final energy = total energy + initial energy

    where

    initial energy = 504 J

    total energy = 222 - 111 = 111 J

    final energy = 504 + 111 = 615 J
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