Sub 12 means from stage one to two. Heat transfer (Qsub12) occurs to a fluid of mass m whose volume increases at a constant pressure of 21 bar. Assume that the fluid is air (Csubv=0.718 kJ/kg *K and R=0.287 kJ/kg*K) and that Tsub1=725K and Tsub2=1100K. Assume that the fluid expansion is fully resisted. Determine in kJ/kg
a) Wsub12 (or Wsub12/m)
b)Deltau (or deltaU/m)
c)qsub12 (or Qsub12/m)