Discussion
Consider the following statements about shear flow:
1. It is the shear stress multiplied by the wall thickness.
2. It stays constant along a wall of varying thickness.
3. It has units of stress.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct and follow from each other: \( q = \tau t \), and equilibrium keeps it constant along a wall whose thickness varies. Statement 3 is dimensionally wrong - shear flow is force per unit length, N/mm or kN/m, not force per unit area.
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