Theory of Structures
Flat spiral springs

Consist of uniform thin strips
All of these
Consist of uniform thin strips
Are wound by applying a torque

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Theory of Structures
Slenderness ratio of a long column, is

Radius of gyration divided by area of cross-section
Area of cross-section divided by least radius of gyration
Area of cross-section divided by radius of gyration
Length of column divided by least radius of gyration

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