Question

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

1,500 J

900 J

300 J

Answer 1

The Answer Is 1,500
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Answer 2

The answer is 1500 J

consider the variables in the equation for the first law of thermodynamicis .