2. A system for heating water from an inlet temperature of 20C to an outlet temperature of 60C involves passing the water through a thick-walled tube having inner and outer diameters of 20 and 40mm. The outer surface of the tube is well insulated, and electrical heating within the wall provides for a uniform generation rate of 106W/m3. a. For a water mass flow rate of 0.1kg/s, how long must the tube be to achieve the desired outlet temperature? b. If the inner surface temperature of the tube is 70C at the outlet, what is the local convection heat transfer coefficient at the outlet