Question: The return spring of a control arm must pull the arm with a 30N force at the position shown in the figure, and a 40N

The return spring of a control arm must pull the arm with a 30N force at the position shown in the figure, and a 40N force at maximum extension, which is 12mm. The material used is AISI 4130 spring steel with 1370MPa ultimate strength. For the spring index of C=10, and safety dynamic factor of 2.5, find the wire diameter of the spring and the active number of coils. The total length of the spring must not exceed 60mm.

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