Theory of Structures
A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is_____.
- A. 4WD²n/d4N
- B. 4W²Dn/d4N
- C. 4W²D3n/d4N
- D. 4W²D3n²/d4N
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