A piston cylinder arrangement contains 0.02 m³ of air at 50°C and 400 kPa. Heat is added in the amount of 50 kJ and work is done by a paddle wheel until the temperature reaches 700°C. If the pressure is held constant, how much paddle-wheel work must be added to the air? Assume constant specific heats. Equations to be used: о - W раddle 3 т (hz — h) %3D тср (Тz — T1) PV m = RT

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