A circular column is subject to a fluctuating bending stress, which varies between 10,000 psi and 30,000 psi. The material used for this column is 3140 OQT1300 steel. Stress concentration factor is 1.30 and the actual endurance limit ( Sn' ) for this material is 42 ksi. Determine the design factor N, using Goodman Criteria.

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