Theory of Structures
If E, N, K and 1/m are modulus of elasticity, modulus of rigidity. Bulk modulus and Poisson ratio of the material, the following relationship holds good

All of these
E = 3K (1 – 2/m)
E = 2N (1 + 1/m)
(3/2)K (1 – 2/m) = N (1 + 1/m)

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Theory of Structures
Slenderness ratio of a long column, is

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

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