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Question: number 20 please...

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ncl Is Buried oI uiallleterd to a depth d/3 in the earth, the upper portion being heated by the sun (assume the surface is flat). Heat conduction analysis requires a description of the buried portion of the enclosure in spherical coordinates. Find it. 20. An oil filter cartridge is a porous right-circular cylinder inside which oil diffuses from the axis to the outer curved surface. Describe the cartridge in cylindrical coordinates, if the diameter of the filter is 4.5 inches, the height is 5.6 inches, and the center of the cartridge is drilled (all the way through) from the top to admit a g-inch-diameter bolt. 21. Describe the surface given in spherical coordinates by p cos 26
Number 20 please

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