The diagram shows a steel tube whose wall thickness $w$ is tiny compared with the tube’s diameter. A force $T$, acting parallel to the tube’s axis, puts the tube in tension. In order to lower the stress in the tube material, the wall is to be made thicker. If the tube diameter and the tension stay unchanged, which wall thickness gives half the stress?
- A$\frac{w}{2}$
- B$\sqrt{2}w$
- C$2w$
- D$4w$