A turbojet engine has a converging nozzle with variable area. At one sea level operating condition, the engine exhaust flow is 100 kg/s and the stagnation state entering the nozzle is 1100K and 3 atm. The specific heat ratio may be assumed constant at 1.33. If the nozzle is isentropic, find the required exit area. If instead the nozzle efficiency is 90%, find the exit stagnation pressure and the percentage increase in required exit area.

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.