Discussion
Assertion (A): The product of inertia vanishes for a section with one axis of symmetry.
Reason (R): Contributions from either side of the axis cancel in pairs.
Select the correct answer from the options below.
Answer: D
Both statements are true and the second explains the first. For every element at a positive coordinate there is a mirror element at the negative one, so the integral of the product cancels. Such reference axes are therefore already principal axes.
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