Air with a mass flow rate of 2.3 kg/s enters a horizontal nozzle operating at a steady-state at 450 K, 350 kPa, and a velocity of 3 m/s. At the exit, the temperature is 300 K and the velocity is 460 m/s. Using the ideal gas model for air with constant cp = 1.011 kJ/kg*K, determine
a. the area at the inlet, in m^2
b. the heat transfer between the nozzle at its surroundings in kW.
c. Specify whether the heat transfer is to or from the air.