Lubricating oil is cooled in a tubular heat exchanger to maintain its viscosity and effectiveness in the journal bearings used in a large steam turbine of an electric power plant. Oil flows at the rate of 0.1 kg/s inside a 12.5-mm-diameter circular tube, which is maintained at a uniform surface temperature of 25°C, and the oil is cooled from 80°C to 40°C. Calculate the length of tube required for this heat exchanger, the total heat flux dissipated from its surface in the cooling process, and the pressure drop across the tube length.