Discussion
Consider the following statements about the section modulus:
1. It equals the second moment of area over the extreme fibre distance.
2. Maximum stress is the applied moment divided by it.
3. It has units of length to the fourth power.
Which of the statements given above is or are correct?
Answer: C
The first two are correct. The third gets the units wrong: dividing a fourth power by a length leaves a cube, so the section modulus is in cubic millimetres. It is the second moment of area that carries the fourth power.
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