An air- standard Diesel cycle has a compression ratio of 18.2. Air is at 120°F and 14.7 psia at the beginning of the compression process and at 3200 R at the end of the heat-addition process.Accounting for the variation of specific heats with temperature, determine (a) the cutoff ratio, (b)the heat rejection per unit mass, and (c) the thermal efficiency. (put in thermal efficiency in as percent)