Heat transfer in laminar tube flow, One hundred pounds per hour of oil at 100°F is flowing through a 1-in.i.d. Copper tube, 20ft long the inside surface of the tube is maintained at 215°F by condensing steam on the outside surface. Fully developed flow may be assumed through the length of the tube, and the physical properties of the oil may be considered constant at the following values: p = 55lb_m/ft³, C_p = 0.49 Btu/lb_m ∙ F, µ = 1.42 lb_m/hr ∙ ft, k = 0.0825 Btu/hr ∙ ft ∙ F. 

(a) Calculate Pt. 

(b) Calculate Re. Calculate the exit temperature of the oil.