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In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Respuesta :

Answer : [tex]U_f=2500\ J[/tex]

Explanation :

It is given that,

Heat that enters the system, Q = 1000 J

Work done by the system, W = -500 J

Initial internal energy [tex]U_i=2000\ J[/tex]

We know from first law of thermodynamics:

[tex]\Delta U = U_f-U_i=Q+W[/tex]

So, final internal energy will be :

[tex]U_f-2000\ J=1000\ J-500\ J[/tex]

[tex]U_f=2500\ J[/tex]

So, the final internal energy of the system is 2500 J.

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