Over the range 720-1900 R, the specific heat of air may be approximated by the equation.
One pound-mass of air is heated at constant pressure from 300°F to 1300°F. Calculate the required thermal energy input if:
a) The specific heat is assumed constant at its room-temperature value.
b) The specific heat is assumed constant at a value corresponding to that at the mid-point of the temperature range (800°F).
c) The specific heat is assumed to vary constantly according to the approximate equation.