A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ. Then the work done by the system is

A closed system receives 60 kJ heat but its internal energy decreases

1.	A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ. Then the work done by the system is
A.	90 kJ
B.	30 kJ
C.	-30 kJ
D.	-90 kJ
Answer» B. 30 kJ

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A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ. Then the work done by the system is

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