Fundamental of Thermodynamics & Heat Transfer

A hollow cylinder with inner and outer diameter of 8 cm and 12 cm respectively has an inner surface temperature of 200°C and the outer surface of 50°C. If the thermal conductivity of the cylinder material is 60 W/mK, determine heat transfer from the unit length of the pipe. Also determine the temperature of the surface at a radial distance of 5 cm from the axis of the cylinder.