A four-cylinder, 1.5-L spark-ignition engine operates on an ideal air-standard Otto cycle. The intake air is at 90kPa and 27C. The volume of the cylinder is 437.5cm3 prior to the compression stroke. The maximum cycle temperature is 1127C. Accounting for the variation of specific heats with temperature, calculate for cycle: 1. the heat rejection in kJ 2. the net work output in kJ 3. the thermal efficiency in kJ 4. the mean effective pressure 5. Re-solve questions 1) to 3) by using constant specific heat at 300K