In a heat engine, 700 J of heat enters the system, and the piston does 400 J of work.

Question

What is the final internal (thermal) energy of the system if the initial energy is 1200 J?

Responses

300 J

300 J

900 J

900 J

1100 J

1100 J,

1500 J

Answer 1

To find the final internal (thermal) energy of the system, we can start by using the first law of thermodynamics:

Change in internal energy = Heat added - Work done

Change in internal energy = 700 J - 400 J
Change in internal energy = 300 J

The final internal (thermal) energy of the system is 300 J.

Therefore, the correct response is: 300 J