Given that d = diameter of spring. R = mean radius of coils. n = number of coils, and G = modulus of rigidity. The stiffness of the close-coiled helical spring subject to an axial load W is equal to:

\[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]

\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]

\[\frac{G{{d}^{4}}}{32{{R}^{3}}n}\]

\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]

Given that d = diameter of spring. R = mean radius of coils. n = numbe

1.	Given that d = diameter of spring. R = mean radius of coils. n = number of coils, and G = modulus of rigidity. The stiffness of the close-coiled helical spring subject to an axial load W is equal to:
A.	\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]
B.	\[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]
C.	\[\frac{G{{d}^{4}}}{32{{R}^{3}}n}\]
D.	\[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]
Answer» B. \[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]

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Given that d = diameter of spring. R = mean radius of coils. n = number of coils, and G = modulus of rigidity. The stiffness of the close-coiled helical spring subject to an axial load W is equal to:

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