A 2-cm diameter "Stainless Steel AISI 316′′ pipe that is 15 meters long is used to heat ethylene glycol from 14∘ C to 40∘ C. It is known that the ethylene glycol runs through the pipe at a speed of 8 m/s, while the surface of the pipe is kept at a constant temperature T_1, by being kept in a hot water bath. a) Calculate the required temperature T_1 of the pipe's surface ( 8 points) b) At some point during the operation, the ethylene glycol flow rate drops to one-tenth (10\%) of the original value. You notice that while the ethylene glycol still enters at 14∘ C and the pipe surface is maintained the temperature calculated in part a, the ethylene glycol no longer exits at 40∘C. Calculate the exit temperature of the ethylene glycol