P5.38 (WP) A 0.625 in. diameter steel [E = 30,000 ksi] bolt (1) is placed in a copper [E = 16,000 ksi] tube (2), as shown in Figure P5.38. The tube has an outside diameter of 1.50 in., a wall thickness of 0.1875 in., and a length L = 9.0 in. Rigid washers, each with a thickness t = 0.125 in., cap the ends of the copper tube. The bolt has 20 threads per inch. That is, each time the nut is turned one complete revolution, the nut advances 0.05 in. (i.e., 1/20 in.). The nut is hand tightened on the bolt until the bolt, nut, washers, and tube are just snug, meaning that all slack has been removed from the assembly but no stress has yet been induced. What stresses are produced in the bolt and in the tube if the nut is tightened an additional quarter turn past the snug-tight condition?

Q1. it's required to determine the diameter of pipe BC

I thought it was the opposite. Why is the steel rod the diameter of the tube?

A0.375-in.-diameter steel [E = 30,000 ksi] bolt (1) is placed in a copper tube (2), as shown. The copper [E = 16,000 ksi] tube has an outside diameter of 1.000 in., a wall thickness of 0.12 in., and a length of L= 7.0 in. Rigid washers, each with a thickness of t= 0.125 in., cap the ends of the copper tube. The bolt has 24 threads per inch. This means that each time the nut is turned one complete revolution, the nut advances 1/24 in. The nut is hand-tightened on the bolt until the bolt, nut, washers, and tube are just snug, meaning that all slack has been removed from the assembly, but no stress has yet been induced. What stresses are produced in the bolt and in the tube if the nut is tightened an additional quarter turn past the snug-tight condition? Rigid washer Rigid washer Bolt () Tube (2) If the force induced in the bolt by advancing the nut is F1, and force induced in the tube by advancing the nut is F2, what is the relationship between F1 and F2?