1. Tardigrade
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  4. The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from A→ B→ C is 30 J, and 40 J4 heat is given to the system. The change in internal energy between A and C is:

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Q. The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from $ A\to B\to C $ is $30 \,J,$ and $40 \,J4$ heat is given to the system. The change in internal energy between A and C is:Physics Question Image

Bihar CECEBihar CECE 2005Thermodynamics

Solution:

Since, work is done by the system, so it is positive. Therefore,
$ \Delta W=30\,J $
Heat given to the system,
$ \Delta Q=40\,J $
According to first law of thermodynamics, change in internal energy is given by
$ \Delta U=\Delta Q-\Delta \,W $
$ =40-30=10\,J $