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What is the correct answer?
4
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/D
3
n
B.
Cd⁴/2D
3
n
C.
Cd⁴/4D
3
n
D.
Cd⁴/8D
3
n
Correct Answer :
D. Cd⁴/8D
3
n
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