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:

Question

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: (A) 10 J (B) 70 J (C) 84 J (D) 134 J

Tardigrade Admin · Accepted Answer

Since, work is done by the system, so it is positive. Therefore,

Δ W = 30 J

Heat given to the system,

Δ Q = 40 J

According to first law of thermodynamics, change in internal energy is given by

Δ U = Δ Q - Δ W

= 40 - 30 = 10 J

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→B→C is 30J, and 40J4 heat is given to the system. The change in internal energy between A and C is:

10 J

70 J

84 J

134 J

Since, work is done by the system, so it is positive. Therefore, ΔW=30J Heat given to the system, ΔQ=40J According to first law of thermodynamics, change in internal energy is given by ΔU=ΔQ−ΔW =40−30=10J

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 $40 J 4$ heat is given to the system. The change in internal energy between A and C is:

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