First slide

First law of thermo dynamics

Question

A system absorbs and 800 Joules of heat and does 600 Joules of work. Change in internal energy for the process is

Easy

A

+1400 J
B

-1400 J
C

-200 J
D

+200 J

Solution

Heat absorbed by the system = +800 J
Work done by the system = -600 J
$∆$ E = (+800 -600)J
$∆$ E = +200 J

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