The internal energy of a gas decreases by 60 J while it does 40 J of work. The heat supplied to it is: (Use Q = Delta U + W, where Q = heat supplied to the gas and W = work done by the gas.)

  1. -200 J
  2. -10 J
  3. -40 J
  4. -20 J
Answer

D) -20 J

Q = Delta U + W = -60 + 40 = -20 J. (Negative: heat flows out.) SLO P-11-C-08 · Application

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