Helium contained in a closed, rigid tank, initially at 50°C, 5 bar, and a volume of 2 m3, is heated to a final pressure of 8 bar. Assume the ideal gas model for the helium. Kinetic and potential energy effects can be ignored. Determine the mass of the helium, in kg, and the heat transfer, in kJ.

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