First slide

First law of thermo dynamics

Question

A system absorbs and 200 Joules of heat and does 600 Joules of work. Change in internal energy for the process is

Easy

A

+800 J
B

-800 J
C

-400 J
D

+400 J

Solution

Heat absorbed by the system = +200 J
Work done by the system = -600 J
$∆$ E = (+200 -600)J
$∆$ E = -400 J

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