Question: The spring constant for a helical coil spring, k , theoretically follows the form shown where d ( lower case ) is the wire diameter,

The spring constant for a helical coil spring, k, theoretically follows the form shown where d (lower case) is the wire diameter, D (UPPER CASE) is the mean diameter of the coil, na is the number of active coils and G is a material property called the shear modulus.
Out side diameter OD =13 mm
Wire diameter d =1600 microns
Active coils na =63
modulus G =66 kN/sq.mm.
Also assume that all the measurements have an uncertainty of 2.7% of the average. Use the High-Low method to determine (a) k and (b) delta-k, the uncertainty in k in N/m.
What is k and delta k.

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