Air enters a nozzle in steady flow at 280 kPa and 77 C with a velocity of 50 m/s. The air leaves the nozzle at 85 kPa and 320 m/s. The atmosphere which surrounds the nozzle is at 20 C. The nozzle is not well insulated; heat transfer losses from the nozzle are estimated as 0.35 kJ/kg. Using the air tables find the exit temperature of the air and the total entropy change for the process.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?