A helical compression spring of music wire has a maximum load that is 4 lb greater than the minimum load. The deflection under the maximum load is 0.25 in. greater than the deflection under the minimum load. Assume tentatively that the number of active coils is 10. The factor of safety is 1.5 R = 0.25 in. Determine a suitable standard-size wire and find the exact number of active coils. Find the initial deflection of the spring.
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