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6 November, 20:22

In each cycle, a heat engine performs 710 J of work and exhausts 1480 J of heat. What is the thermal effiency?

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  1. 6 November, 20:42
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    32%

    Explanation:

    For a heat engine, efficiency is work out divided by heat in:

    η = Wₒ / Qᵢ

    Since energy is balanced, heat in is the sum of work out and heat out:

    Qᵢ = Wₒ + Qₒ

    Therefore:

    η = Wₒ / (Wₒ + Qₒ)

    Given Wₒ = 710 J and Qₒ = 1480 J:

    η = 710 / (710 + 1480)

    η = 0.32

    The thermal efficiency is 32%.
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