Aconvergent-divergent nozzle is designed to expand air from a chamber in which the pressure is 700 kpa and the temperature is 35°c to give mach 1.6. the mass flow rate through the nozzle under design conditions is 0.012 kg/s. find
a. the throat and exit areas of the nozzle
b. the design back-pressure and the temperature of the air leaving the nozzle with this back-pressure nozzle
c. the lowest back-pressure for which there will be no supersonic flow in the
d. the back-pressure below which there are no shock waves in the nozzle

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.