Aconvergent-divergent nozzle is designed to operate with an exit mach number of 2.0. the nozzle is supplied from an air reservoir in which the pressure is 500 kpa; the temperature is 500 k. the nozzle throat area is 5 cm2. assume air to behave as a perfect gas, with \gamma= 1.4 and r = 0.2870 kj/kgk.

(a) determine the ratio of exit area to throat area.

(b) given the area ratio in part (a), find the range of back pressure over which the nozzle is choked.

(c) determine the mass-flow rate for a back pressure of 450 kpa.

(d) determine the mass-flow rate for a back pressure of 0 kpa.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?