lymer is initially exposed to 13.8 MPa of axial tension at room temperature. If the polymer features a relaxation time of 26.2 hr at room temperature, how long will it take for the tensile stress in the polymer to reach 10.3 MPa

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