Heat (Q) = -125 J. (Delivers to the surrounding)
Work (W) = -545 J (Delivers to the surrounding)
Internal energy (∆E) =?
From 1st law of thermodynamics: ∆E = Q + W
∆E = -125 J + (-545 J)
∆E = -(125 + 545) J
∆E = -670 J
(The change in internal energy of system = -670 J)
2nd option is correct.
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