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Tension in a spring that's bent into a semicircle
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[QUOTE="haruspex, post: 6853913, member: 334404"] Yes, it is non obvious. When a helical spring is stretched, each small cylindrical element of the wire is twisted about its axis. So it involves shear moments, like a torsion wire. (Confusingly, a "torsion spring" works through bending moments.) However, you are probably not expected to get into such detail. Nearly right… think that through again. But it is not the diameter that is of direct relevance; as I asked, what is the distance around the outer perimeter of the curved spring? Hence, how much has the spring been stretched on that side? [/QUOTE]
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Tension in a spring that's bent into a semicircle
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