1. Tardigrade
  2. Question
  3. Physics
  4. Thermodynamical behaviour of a gas is represented by a right angled triangle A B C on a P-V diagram. The co-ordinates A, B and C are: A (20,6), B (30,18) and C (30,6) where P is in N / m 2 and V is in m 3. Calculate the work done by the gas in joules.

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Q. Thermodynamical behaviour of a gas is represented by a right angled triangle $A B C$ on a $P-V$ diagram. The co-ordinates $A, B$ and $C$ are: $A (20,6), B (30,18)$ and $C (30,6)$ where $P$ is in $N / m ^{2}$ and $V$ is in $m ^{3}$. Calculate the work done by the gas in joules.

Thermodynamics

Solution:

image
Work done is area under the $P - V$ graph
$\therefore W =\frac{1}{2} \times AC \times BC $
$=\frac{1}{2} \times 10 \times 12=60\, J$