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Design a helical torsion spring that must give a minimum moment of Mmin (lb-in) and a maximum moment of Mmax (lb-in) over a dynamic deflection

Design a helical torsion spring that must give a minimum moment of Mmin (lb-in) and a maximum moment of Mmax (lb-in) over a dynamic deflection of 90o. An infinite life is desired. Use a factor of safety of 1.5 to estimate wire diameter. State all assumptions.

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