Air that is contained within a pistoncylinder assembly is ex

Air that is contained within a piston-cylinder assembly is expanded. The air is initially at 150 kPa, 0.03 m^3, and undergoes a constant pressure expansion to 0.11 m^3, at which point the pressure decreases linearly until the volume is 0.14 m^3. Determine the total work in kJ. Also express your answer in ft-lbf. for work calculation for correct answer in kJ for correctly carrying units for correct answer in ft-lbf

Solution

Total work done = Total area under the curve

= 150*10³*(0.11-0.03)+100*10³*(0.14-0.11)+0.5*(150-100)*10³*(0.14-0.11)

=15750 Nm

=11616.6038511128 ft-lbf

=15.75 KJ