Compressed air is stored in a pressure bottle with a volume of 100 L, at 500 kPa absolute and 20C. At a certain instant, a valve is opened and mass flows from the bottle at m_ = 0:01 kg=s. Find the rate of change of temperature in the bottle at this instant.

Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent