A heating section consists of a 10 inch diameter duct which houses a 8 kW electric resistance

Question:

A heating section consists of a 10 inch diameter duct which houses a 8 kW electric resistance heater. Air enters the heating section at 14.7 psia, 40oF and 35% relative humidity at a velocity of 21 ft/s. Determine
(a) The exit temperature (T2),
(b) The exit relative humidity of the air and
(c) The exit velocity (V2).