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  • Please help: Carnot cycle

    rybyrd

    Member

    Updated: Oct 25, 2024
    Views: 923
    I'm trying to study for my physics test and I need help.

    The problem is "A carnot engine operates with a cold reservoir temperature of 194 K and has an efficiency of 74.3 %. (A) What is the temperature of the hot reservoir? (B) If the engine does 8.99*10^4 J of net work during each cycle, how much heat does it absorb form the hot reservoir during a cycle?


    I took the efficiency equation e=1-Tc/ Th and got 755 K for the first part of the equation, but I cannot seem to get the second part. Any suggestions??

    How do you find out how much heat is absorbed by the hot reservoir during a cycle?
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  • sharon09

    Member • Mar 29, 2010

    Efficiency also equals to Wnet/Qh . Plug in the values n u will get the answer.
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  • shubhrajeet tiwa

    Member • Mar 31, 2010

    let source temp beT THEN
    EFFECIENCY ={{T-194}/T}=.743
    THIS GIVE VALUE OF T
    NOW
    AS W =8.99^4
    WHICH IS EQUAL TO Q1-Q2
    THERFORE
    W/Q1=EFFICENCY
    THIS GIVES Q1
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