An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27? c, and 750 kj/kg of heat is transferred to air during the constant-volume heat addition process. taking into account the variation of the variation of specific heats with temperature, determine: a) the pressure and temperature at the end of the heat-addition process, b) the net work output c) the thermal efficiency and d) the mean effective pressure for the cycle