Acompression ignition engine is to be modeled using the ideal air-standard diesel cycle using constant specific heat (use cp = 0.240 [btu/(lbm r) and k = 1.4). this engine has a compression ratio of 20 and 400 [btu/lbm] are added during the heat addition process, and the state 1 temperature and pressure are 100°f and 15 [psia], respectively. calculate a)-the temperature and pressure after compression b)-the temperature and pressure after heat addition c)-the cutoff ratio d)-the thermal efficiency e)-the mean-effective pressure

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.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?