The buried pipeline in Figure P13–29 transports oil with an average temperature of 60 °...

The buried pipeline in Figure P13–29 transports oil with an average temperature of 60 ° F. The pipe is located 15 ft below the surface of the earth. The thermal conductivity of the earth is 0.6 Btu/(h-ft-° F). The surface of the earth is 50 ° F. Determine the temperature distribution in the earth.