The thick walled copper sphere has an inside diameter of r1 = 2.2 cm and outside diameter of r2 = 4.5 cm. The inner & outer surface is maintained at T1 = 285°C & T2 = 320°C, respectively.The conductivity K is given by K = 370 - 0.0344T - 0.00145T². Find the heat transfer $$\frac{Q}{A} = -K\frac{dT}{dr}$$

The thick walled copper cylinder has an inside diameter of r1 = 1.5 cm and outside diameter of r2 = 4 cm. The inner & outer surface is maintained at T1 = 290°C & T2 = 318°C, respectively. The conductivity K is given by K = 370[1- 9x10^-5(T-150)]. Determine heat loss per unit length. Find the heat transfer per unit Length $$\frac{Q}{A} = -K\frac{dT}{dr}$$ $$\text{find} \ \frac{Q}{L}$$