Discussion
Which advantage does a hollow shaft have over a solid one?
Answer: C
Torsional stiffness depends on the fourth power of the radius, so material near the axis contributes almost nothing and is better removed. The same principle governs bending. A hollow section also has a higher critical speed for its weight. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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