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  4. A thermodynamic system undergoes a cyclic process ABC as shown in the diagram. The work done by the system per cycle is

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Q. A thermodynamic system undergoes a cyclic process ABC as shown in the diagram. The work done by the system per cycle isPhysics Question Image

KCETKCET 2019Thermodynamics

Solution:

Work done =$p\times\Delta v$
Work done = Area of triangle ABC
$\therefore \, W=\frac{1}{2}\left(10-5\right)\times\left(100-400\right)=\frac{5}{2}\times\left(-300\right)=-750 J$
The negative sign means the work is done by the system.