One lbm of R-134a is expanded isentropically in a closed system from 100 psia and 100°F to 10 psia. Determine the total heat transfer and work production for this process.

The volume of 1 kg of hellum in a piston-cylinder device is initially 5 m3, Now helium is compressed to 2 m3 while its pressure is maintained constant at 130 kPa, Determine the initial and final temperatures of helium as well as the work required to compress it, in kJ. The gas constant of helium is R= 2,0769 kJ/kg-K, The initial temperature of helium is 130000 K, The final temperature of helium is 455000 The work required to compress helium is K. 455 kJ. H Next >

A 70-lbm copper block initially at 220°F is dropped into an insulated tank that contains 1.2 ft3 of water at 65°F. Determine the work potential wasted during this process. Assume the surroundings to be at 65°F.

A 100L rigid tank contains nitrogen (N2) at 627°C and 6MPA. If the tank is cooled to 100K, the net amount of work and heat involved in this process is kJ