5 An air-standard Otto cycle has a compression ratio of 8, and the temperature and pressure at the beginning of the compression process are 520°R and 14.2 lbf/in?, respectively. The

mass of air is 0.0015 lb. The heat addition is 0.9 Btu. Determine • the maximum temperature, in °R. the maximum pressure, in lbf/in? the thermal efficiency.