Initially there are 3 [kg) of gas at a pressure of 200 [kpa] and specific volume of 1.5 [m3/kgl contained within a piston cylinder assembly. the gas undergoes a polytropio process for which py2-constant until the specific volume is 1.0 (m3/kgl and the specific internal energy decreases by 150 [kj/kg). find the amount of heat transfer between the system and surroundings in [kj].

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Fluids at rest possess no flow energy. a)- true b)- false