Discussion
A bolt is passed through a tube and tightened on the other end with the help of a washer and nut. If nut is fully tightened, then :
Answer: D
The bolt is under tension but the tube is under compression.
Tightening the nut pulls the bolt head and the nut towards each other. The tube, trapped between them, is squeezed, so it is in compression. The bolt, held at both ends while being pulled, is stretched, so it is in tension.
The tensile force in the bolt equals the compressive force in the tube, since there is no external load. The tube cannot be in tension because nothing pulls on its ends, and the bolt cannot be in compression because the nut pulls on it.
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