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10-05-2018
Physics

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In a heat engine, if 700J of heat enters the system, and the piston does 400J of work, what is the final internal thermal energy of the system if the initial energy is 1200J?

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mixter17 mixter17

10-05-2018

Hello!

Answer:

1500 J

Explanation:

We are going to use the first law of thermodynamics which can be summarized as:

Δ[tex]U=Q-W[/tex]
[tex]U2-U1=Q-W[/tex]

So, we have that:

[tex]U1=1200j \\ W=400 \\ Q=700j[/tex]

[tex]U2=Q-W+U1[/tex]

By substituting we have:

[tex]U2=700 J - 400 J + 1200J=1500J[/tex]

Have a nice day :)

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