Question

50 J of work was done on a system, as a result of which 29 J of heat energy was removed from it. How would this affect the internal energy of the system? A) The internal energy of the system would decrease by 21 J. B) The internal energy of the system would increase by 21 J. C) The internal energy of the system would decrease by 79 J. D) The internal energy of the system would increase by 79 J.

Answer 1

Work done=50J

Heat removed=29J

Now

`\\ \sf\longmapsto \Delta E=-50+29`

`\\ \sf\longmapsto \Delta E=-21J`

Hence the internal energy would decrease by 21J

• Option B is correct