Q162 / 180 · KCET 2019 · Physics
A thermodynamic system undergoes a cyclic process \( A B C \) as shown in the diagram. The work
done by the system per cycle is
done by the system per cycle is
- Correct answerA\( -750 \mathrm{~J} \)
- B\( 750 \mathrm{~J} \)
- C\( 1250 \mathrm{~J} \)
- D\( -1250 \mathrm{~J} \)
Solution
(A)
Work done \( =p \times \Delta v \)
Work done = Area of triangle ABC
\( \therefore W=\frac{1}{2}(10-5) \times(100-400) \)
\( =\frac{5}{2} \times(-300)=-750 \mathrm{~J} \)
The negative sign means the work is done by the system.
Work done \( =p \times \Delta v \)
Work done = Area of triangle ABC
\( \therefore W=\frac{1}{2}(10-5) \times(100-400) \)
\( =\frac{5}{2} \times(-300)=-750 \mathrm{~J} \)
The negative sign means the work is done by the system.
Hence, the correct answer is option: 'A'.