At the beginning of the compression process of an air-standard otto cycle, p1 = 1 bar and t1 = 300 k. the compression ratio is 8.5 and the heat addition per unit mass of air is 1400 kj/kg. determine the thermal efficiency as a percent (input a number only). do not assume specific heats are constant.

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?