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  4. In the diagram shown Q text iaf =80 cal and W text iaf =50 cal. If W=-30 cal for the curved path fi, value of Q for path fi, will be

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Q. In the diagram shown $Q_{\text {iaf }}=80$ cal and $W_{\text {iaf }}=50$ cal. If $W=-30$ cal for the curved path $fi$, value of $Q$ for path $fi$, will bePhysics Question Image

Thermodynamics

Solution:

image
From process iaf
Find $\Delta U$ first, $\Delta Q=\Delta W+\Delta U$
$80=50+\Delta U$
$30 cal =\Delta U$
Use this $\Delta U$ for process if
$\Delta Q=\Delta W+\Delta U $
$\Delta Q=-30+(-30)=-60\, cal$