28. A close-coiled helical spring has stiffness of 10 N/mm. Its length when full ompressed with adjacent coils touching each other is 400 mm. The modulus of rigidity of materic of the spring = 80000 N/mm?. (i) Determine the wire diameter and mean coil diameter, if their ratio is 1/10. %3D (ii) If the gap between any two adjacent coils is 2 mm, what maximum load can be applie before the spring becomes solid i.e. adjacent coils touch. What is th

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