Nitrogen flows at steady state through a horizontal, insulated pipe with inside diameter of 2 (in). A pressure drop results from flow through a partially opened valve. Just upstream from the valve the...

Nitrogen flows at steady state through a horizontal, insulated pipe with inside diameter of 2 (in). A pressure drop results from flow through a partially opened valve. Just upstream from the valve the pressure is 120 (psia), the temperature is 110 ("F). and the average velocity is 20 ft/s. If the pressure just downstream from the valve is 20 (psia), what is the temperature? Assume for air that PV/T is constant.