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Academics – Applied Mechanics : 2014/DEC/06
Question

Q1. A close coiled helical spring has a free length of 120 mm and 20 coils of 6 mm diameter wire. Under load the spring length increases to 160 mm whilst the maximum shear stress in this condition is 45 MN/m2. Calculate the mean diameter of the coils.

Note: Modulus of Rigidity for the spring material = 83 GN/m2.

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