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27 October, 13:57

If heat flows into a system and the system does work on the surroundings, what will be the signs on q and w? Select the correct answer below O positive q, positive w O positive q, negative w O negative q, positive w O negative q, negative w

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  1. 27 October, 15:01
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    q = Positive

    w = Negative

    Explanation:

    As per first law of thermodymanics,

    ΔE = q + w

    Where,

    ΔE = Change in internal energy

    q = Heat absorbed or heat released by the system

    w = Work done

    Sign conventions are used for heat transfer and work done during a thermodynamics process.

    Sign convention for Heat transfer

    q is positive when heat is added to the system or heat absorbed by the system this is because energy of the system is increased. q is negative when heat is withdrawn from the system or heat released by the system.

    Sign convention for Work done

    w is positive if work is done on the system or work is done by the surroundings w is negative if work is done on the system or work is done on the surrounding.

    In the given question, work is done on the surroundings so, w is negative.

    Heat flows into a system or in other word heat is added to the system,

    So q is positive.
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