Problem 1. SAE 50 oil flows at a mass flowrate of 0.007 kg/s through a 1-cm I. D. tube that is 1.5 m long. The wall temperature is at 300 K and the inlet oil temperature is 377 K. Calculate: (1) The average heat transfer coefficient, (2) the oil temperature at the outlet, and (3) the convective heat loss from the oil.