Discussion
Match each quantity in List I with its expression in List II.
List I
A. Shear flow under torsion
B. Shear stress in a wall
C. Open-section torsion constant
D. Step in flow at a boom
List II
1. Flow divided by wall thickness
2. Torque over twice the enclosed area
3. Shear force over I, times boom area times its distance
4. One third of the sum of s times t cubed
Select the correct match.
Answer: C
These four relations carry most of the arithmetic in the topic. The contrast between the second and fourth is the important one: closed-section capacity depends on thickness linearly, open-section stiffness on its cube.
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