thermodynamics course

P1: A piston-cylinder device initially contains air at 150kPa and 27C. At this state, the volume is 400 liters. The mass of the piston is such that a 350kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine work done by the air. a) 120kJ b) 130kJ c) 100kJ d) 140kJ P2: A piston-cylinder device contains air at 600kPa,290K and a volume of 0.01m3. At constant pressure process the system produces 54kJ of work. The final volume of the air is: a) 0.05m3 b) 0.01m3 c) 0.10m3 d) 0.15m3 P3: Find the change in specific internal energy for carbon dioxide between 600K and 1200K for a constant specific heat value at room temperature. a) 291.8kJ/kg b) 391.8kj/kg c) 491.8kJ/kg d) 591.8kJ/kg P4: Air is compressed in a polytropic process from 325K,125kPa to 500K,300kPa. The specific work for this process is: a) 51.8k/kg b) 61.8kJ/kg c) 71.8kJ/kg d) 81.8kJ/kg