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10 November, 13:25

8. A student does 1,000 J of work when she moves to her dormitory. Her internal energy is decreased by 3,000 J. Determine the heat during this process. Does she gain or lose her heat

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  1. 10 November, 16:50
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    The heat loss during the process = - 4000 J

    Explanation:

    Work done by the student (W) = - 1000 J

    Negative sign on the system is due to work done on the system.

    Decrease in internal energy (U) = - 3000 J

    We know that heat transfer in the system is given by (Q) = U + W

    ⇒ Q = - 1000 - 3000

    ⇒ Q = - 4000 J

    This is the value of heat transfer during the process And negative sign indicates that heat loss during the process.
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