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29 November, 11:25

39C On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighboring rooms? Why? Assume all the doors and windows are kept closed.

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  1. 29 November, 12:11
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    when student return that time room will be hotter

    Explanation:

    we know here room is close no air is come from outside and no air goes outside as window and door is closed

    we know fan is moving and fan does not cool the air it only move the air

    so this process give kinetic energy that is change into heat energy (internal) so that room is heat up

    and we know by the the law of conservation of energy

    there is no loss in energy

    so it only hotter
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