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Question

If the internal energy of a system decreases by 128 J and at the same time it absorbs 56 J of heat, then
  1. work is done by the system equal to +71 J
  2. work is done by the system equal to 71 J
  3. work is done by the system equal to 179 J
  4. work is done by the system equal to 184 J


Solution

The correct option is D work is done by the system equal to 184 J
ΔU=q+W
Internal energy decreases by 128 J thus, ΔU=128 J
Heat is absorbed, q=+56 J
Thus, W=ΔUq=(12856)J=184 J

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