An ideal ramjet engine is being designed for a mach 3.0 aircraft at an altitude of 33,000 ft. the fuel has a heating value of 18,600 btu/lbm and the burner exit total temperature is 3400°r. a thrust of 15,000 lbf is needed. what is the required airflow? what are the resulting nozzle exit and throat diameters? what is the resulting tsfc? for a fixed mach number, plot thrust and tsfc as a function of combustor exit temperature for ranges between the combustor inlet temperature and 4000°r.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux