If 50 calories are added to a system and system does work of 30 calories on surroimdings, the change in internal energy of system is

If 50 calories are added to a system and system does work of 30 calori

1.	If 50 calories are added to a system and system does work of 30 calories on surroimdings, the change in internal energy of system is
A.	20 cal
B.	50 cal
C.	40 cal
D.	30 cal
Answer» B. 50 cal

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If 50 calories are added to a system and system does work of 30 calories on surroimdings, the change in internal energy of system is

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