Physics-
General
Easy

Question

A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is

  1. 20 J    
  2. – 20 J    
  3. 400 J    
  4. – 374 J    

The correct answer is: – 20 J


    Work done by the system = Area of shaded portion on P-V diagram
    equals left parenthesis 300 minus 100 right parenthesis 1 0 to the power of negative 6 end exponent cross times left parenthesis 200 minus 10 right parenthesis cross times 1 0 to the power of 3 end exponent equals 20 J

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