Briefly describe how the molecular weight and percent crystallanity of a polymer influence the property of polymers, make comparisons of thermoplastic polymers, thermosetting polymers, and elastomers (a) on the basis of mechanical characteristics, (b) effect of temperature on mechanical properties, and (c) according to possible molecular structures.

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