Home

When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by

A. Cd⁴/D3n

B. Cd⁴/2D3n

C. Cd⁴/4D3n

D. Cd⁴/8D3n

Please do not use chat terms. Example: avoid using "grt" instead of "great".