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Q7) A close coiled helical spring is required to have an overall stiffness of 90 kN/m with SIX coils such that ratio of the mean diameter to the wire diameter is 5:1.

Calculate EACH of the following:

(a) The mean diameter of the coils. (8)

(b) The maximum shearing stress for a deflection of 3 mm. (8)

Note:

Modulus of rigidity for the spring wire= 80 GN/m².