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What is the change on internal energy of a system that does 20 J of work when Qin=100 J and Qout=50 J? * 1 point

What is the change on internal energy of a system that does 20 J of work when Qin=100 J and Qout=50 J? * 1 point 20 J 30 J 50 J 100 J

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