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Answer:
Change in internal energy AU = 40 J
Explanation:
Given:
Amount of heat added = 70 J
Work done = 30 J
Find:
Change in internal energy AU
Computation:
The net thermal conductivity into a process less the net work performed by the system represents the shift in internal energy.
Change in internal energy AU = Q - W
Change in internal energy AU = 70 J - 30J
Change in internal energy AU = 40 J