Physics Homework Help

A steam pipe is covered with 1.50-cm thick insulating material of thermal conductivity of 2.00 ✕ 10−4 cal/cm · °C · s. How much energy is lost every second when the steam is at 155°C and the surrounding air is at 20.0°C? The pipe has a circumference of 800 cm and a length of 63.0 m. Neglect losses through the ends of the pipe.