1) In the first law of thermodynamics (?U = Q + W), the variables Q and W stand

Question

1) In the first law of thermodynamics (?U = Q + W), the variables Q and W stand for
A) the heat flow out of the system and the work done on the system.
B) the heat flow out of the system and the work done by the system.
C) the heat flow into the system and the work done by the system.
D) the heat flow into the system and the work done on the system.

2) If 30 kJ of heat flows into a system and the internal energy increases by 15 kJ, then what is the work done by or on the system?
A) +15 kJ
B) +65 kJ
C) -65 kJ
D) +85 kJ
E) -15 kJ

Explanation / Answer

1) C 2) 30-15 = 15 kJ so (A)

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