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1 January, 08:35

In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

1,100 J

900 J

1,500 J

300 J

In a heat engine, if 500 J of heat enters the system, and the piston does 300 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,500 J?

1,700 J800 J1,300 J200 J

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Answers (1)
  1. 1 January, 09:55
    0
    We are given with:

    Q = 700 J

    W = 400

    U1 = 1200 J

    From the first law of thermodynamics

    Q = ΔU + W

    Q = U2 - U1 + W

    U2 = Q - W + U1

    U2 = 700 - 400 + 1200

    U2 = 1500 J

    We are given with

    Q = 500 J

    W = 300 J

    U1 = 1500 J

    U2 = 500 - 300 + 1500

    U2 = 1700 J
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