A round casting is 0.2 m (7.9 in.) in diameter and 0.75 m (29.5 in.) in length. Another casting of thesame metal is elliptical in cross section, with a major-to-minor axis ratio of 2, and has the same lengthand cross sectional area as the round casting. Both pieces are cast under the same conditions. What isthe difference in the solidification times of the two casting?

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