First slide

First law of thermo dynamics

Question

A system loses 600 J of heat to the surroundings and does a work of 900 J. Change in internal energy during the process is

Easy

A

-900 J
B

-1500 J
C

+900 J
D

+1500 J

Solution

Heat liberated by the system= -ve;
Workdone by the system = -ve;
Change in internal energy $(∆ E)$ = - 600 J - 900 J = -1500 J

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