Manipal MET2019PhysicsThermodynamics
A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is
Options
- A20 J
- B-20 ~J
- C400 J
- D-374 ~J
Correct answer
B. -20 ~J
Step-by-step solution
aligned & W_ P Q =P V & =100 10^3(300-100) 10⁻⁶ & =100 10⁻³ 200=20 ~J & W_ Q R =0( V is constant ) & W_ R S =P V & =200 10^3(100-300) 10⁻⁶ & =-200 10⁻³ 200=-40 ~J & W_ S P =0 aligned Net work done =20+(-40)=-20 ~J