First slide

Work done by gas

Question

A gas is taken through the cycle A $\to$ B $\to$ C $\to$ A, as shown. What is the net work done by the gas?

Moderate

A

2000 J
B

1000 J
C

Zero
D

-2000 J

Solution

Work done in P-V diagram is equal to area enclosed in P-Z curve
$\Rightarrow W = \frac{1}{2} \times 5 \times 10^{- 3} \times 4 \times 10^{5} = 10 \times 10^{2}$
= 1000 J

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