MDCAT Physics MCQ #3394

A system does 500 J of work and loses 200 J of heat. What is the change in its internal energy?

MDCAT Physics MCQ #3394

  1. Question 1

    Q1. A system does 500 J of work and loses 200 J of heat. What is the change in its internal energy?

    • A) -700 J
    • B) -300 J
    • C) 300 J
    • D) 700 J

    Answer: -700 J

    Explanation: ΔU = Q - W = -200 J - 500 J = -700 J. Other options misapply the first law of thermodynamics.