A hollow cylinder has length L, inner radius R, and thickness d, and the temperatures at the inner and outer surfaces are Th and T1, respectively. The thermal conductivity of the material of which the...

Derive an equation for the rate of heat transfer.

Extracted text: A hollow cylinder has length L, inner radius R, and thickness d, and the temperatures at the inner and outer surfaces are Th and T1, respectively. The thermal conductivity of the material of which the cylinder is made is k. Derive an equation for the rate of heat transfer P through the walls of the cylinder. Simplify this equation assuming that the thickness of the cylinder d is much smaller than the its inner radius R.