Propane at 0.1 MPa, 20o C enters an insulated compressor operating at steady state and exits at 0.4 MPa, 90o C. Neglecting kinetic and potential energy effects, determine a) the power required by the compressor (kJ/kg) b) the change in specific entropy of propane (kJ/kg K) at the outlet and the inlet of the compressor.

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers