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A close-coil helical spring has a mean coil diameter 12 times the diameter of the wire. This spring absorbs 500J if it is compressed by

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A close-coil helical spring has a mean coil diameter 12 times the diameter of the wire. This spring absorbs 500J if it is compressed by 80mm. If the maximum stress is not to exceed 500MPa, calculate: (G=75GPa) 3.1 the wire diameter; 3.2 the mean diameter of the coils; 3.3 the number of coils; 3.4 the stiffness of the spring. [12]

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