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**1. Homework Statement**A hot reservoir is maintained at a temperature of 78 oC, and a cold reservoir is maintained at a temperature of 5oC. They are separated by 11.00 cm, and are connected by a cylindrical bar made of two materials. The radius of the bar is 0.83 cm. The upper part of the bar is made of yellow brass (k = 220 W/(moC)), and has a length of 1.10 cm. The lower part's material is unknown. The temperature where the two materials are in thermal contact is 77.4875 oC. What is the rate of heat flow through the bar?

then find the thermal conductivity?

**2. Homework Equations**q=KA(deltaT)/L

**3. The Attempt at a Solution**i tried to use this equation to find the heat flow, and then I tried to set this equation to find the K for the other substance but its not working...thanks for help!!!