First slide

First law of thermo dynamics

Question

A system absorbs 900J of heat from the surroundings and does a work of 450J. Change in internal energy during the process is

Moderate

Solution

Heat absorbed by the system, q=+Ve ; Workdone by the system , W=- -Ve ;
$∆ E = + 900 J - 450 J = + 450 J$

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