Question Detail
Question
Calculate the value of ΔU in joules for a system that loses 50 J of heat and has 150 J of work performed on it by the surroundings.
Correct Answer
Option D is the correct answer.
Detailed Explanation
ΔU = q + w. Loses heat: q = -50 J. Work done on system: w = +150 J. ΔU = -50 + 150 = +100 J.
Hint
Work done on system is positive; heat lost is negative.