Africtionless piston-cylinder device contains 10 kg of water at 20°c at atmospheric pressure. an external force f is then applied on the piston until the pressure inside the cylinder increases to 80 atm. assuming the coefficient of compressibility of water remains unchanged during the compression, estimate the energy needed to compress the water isothermally. take the water in the cylinder as the system.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature