transfer, each

and change in

2.49 A gas expands in a piston-cylinder assembly from pi 8 bar,

V₁ = 0.02 m³ to P₂ = 2 bar in a process during which the relation be-

tween pressure and volume is pV2 = constant. The mass of the gas is

0.25 kg. If the specific internal energy of the gas decreases by 55 kJ/kg

during the process, determine the heat transfer, in kJ. Kinetic and

potential energy effects are negligible.

Ana

2.54

nowe