In a Diesel cycle, the cutoff ratio is two and the compression ratio is eighteen. At state 1 the air is 14.7 psia and 80 F, and the volume of air at state 1 is 117 cubic inches. Using cv = constant theory, an using thermal properties at state 1, find (a) the temperature (R) and pressure (psia) at states 2, 3, 4 (b) the net work of the cycle (Btu) (c) the cycle thermal efficiency.