Discussion
Which material is a conventional propeller shaft made from?
Answer: B
A hollow tube gives the greatest torsional stiffness for a given weight, since the material furthest from the axis carries the most stress. Aluminium and composite shafts are used where weight or critical speed matter. Solid bar would be needlessly heavy. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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