Physics

Problem

15. In a certain process, 400 J of heat is transferred to a system and the system simultaneously does 100 J of work. The change in internal energy of the system is (A) 500 J (B) 300 J (C) -100 J (D) -300 J (A) 500 J (B) 300 J (C) -100 J (D) -300 J

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