A brass bolt (Eb = 15 x 10⁶ psi) of 38-in. diameter is fitted inside a steel tube (Es = 29 x 10⁶ psi) of 78-in. outer diameter and 18-in. wall thickness. After the nut has been fit snugly, it is tightened a one-quarter full turn. Knowing that the bolt is single-threaded with a 0.1-in. pitch, determine the normal stress in:

(a) the bolt,
(b) the tube.

A) (a) Tension stress, (b) Compression stress
B) (a) Compression stress, (b) Tension stress
C) (a) Tension stress, (b) Tension stress
D) (a) Compression stress, (b) Compression stress