Find the change in internal energy of a system if 75 J of heat is transferred to it, and the system does 45 J of work on the surroundings.
If there is no change of state, what happens to the temperature.
Heat transferred Q = 75 J
Work done W = 45 J
Change ininternal energy U = Q-W
= 75 J - 45 J
= 30 J
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