If he intends to fly the craft at an altitude where the density of air is 1.00 kg/m3 , and the density of the helium inside is 0.178 kg/m3 , the volume of the disc-shaped craft is 40 m3 and has a mass of only 100 N, what is the maximum weight that the craft can carry

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