A hollow, circular, cast-iron pipe (Ec = 12,000 ksi)

A hollow, circular, cast-iron pipe (Ec = 12,000 ksi) supports a brass rod (Eb 14,000 ksi) and weight W = 2 kips, as shown. The outside diameter of the pipe is dc = 6 in.
(a) If the allowable compressive stress in the pipe is 5000 psi and the allowable shortening of the pipe is 0.02 in., what is the minimum required wall thickness tc,min? (Include the weights of the rod and steel cap in your calculations.)
(b) What is the elongation of the brass rod δr due to both load W and its own weight?
(c) What is the minimum required clearance h?

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