Air flows through an Otto cycle, beginning the compression process at 85 kPa and 50°C. During the heat addition process, 1250 kJ/kg of heat is added to the air. Plot the maximum temperature and pressure in the system, the net work per kg of air produced in the cycle, the thermal efficiency of the cycle, and the mean effective pressure for compression ratios ranging between 7 and 12, assuming that the air behaves as an ideal gas with variable specific heats.
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