Y2

A piston-cylinder device initially contains 0.5 kg of steam at 3.5 MPa and 250 "C Now the steam loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 175 .C. Determine the boundary work. P 3.5- Steam 13 0.5 kg 3.5 MPa 250 C V2 V1 stop O 101 kJ O 180 kJ O 217 kJ O 125 kJ5-kg of saturated vapor of R-134a at -10 C is contained in a piston-cylinder device. It undergoes the polytropic process with a pressure of 500 kPa and n = 1.5. Determine the work done during the process. O 47 KJ O 52 KJ O 63 kJ O 71KJ