Nitrogen flows at stead)' state through a horizontal, insulated pipe with inside diameter of 1.5in). A pressure drop results from flow through a partially opened valve. Just upstream from the valve the pressure is l00(psia), the temperature is 120(oF) and the average velocity is 20(ft)(s)-1. If the pressure just downstream from the valve is 20(psia), what is the temperature? Assume for nitrogen that PV/T is constant. Cv = (5/2)R. and CP = (7/2)R. (Values for R are given in App, A.)