An air-standard Otto cycle has a compression ratio of 9. The pressure, temperature, and volume of the air at the beginning of the isentropic compression are 100 kPa, 20 C, and 8x10^-4 m^3, respectively. At the end of the isentropic expansion the temperature is 800 C. Calculate (a) the highest temperature (K) and pressure (kPa) in the cycle, (b) the heat input (kJ), (c) the net work output (kJ), and (d) the thermal efficiency of the cycle. Use variable specific heats for your computations.