An otto engine has been modified to operate with an ethanol-based fuel and so the compression ratio has been increased to 11:5:1, with air-ethanol combustion corresponding to a heat addition at 1650 kJ/kg of air. If the air pressure and temperature at the start of the compression strike are 90 kPa and 25 degC find: the temperatures and pressures at each phase of the cycle; its thermal efficiency; and its net specific work output.