Question: A close coiled helical spring has to absorb (60 mathrm{Nm}) of energy when compressed (5 mathrm{~cm}). The coil diameter is six times the wire diameter.

A close coiled helical spring has to absorb $60 \mathrm{Nm}$ of energy when compressed $5 \mathrm{~cm}$. The coil diameter is six times the wire diameter. If there are 18 coils, estimate the diameters of coil and wire and the maximum shear stress. $G=85,000 \mathrm{~N} / \mathrm{mm}^{2}$.

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