Discussion
Assertion (A): Bending stiffness can be raised without changing the material.
Reason (R): Stiffness depends on the product of Young's modulus and the second moment of area.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second explains the first. Redistributing the same material further from the neutral axis raises the second moment without adding a gram, which is nearly always cheaper in an airframe than changing to a stiffer and denser material.
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