Theory of Structures
A bar L metre long and having its area of cross-section A, is subjected to a gradually applied tensile load W. The strain energy stored in the bar is

WL/AE
W²L/2AE
WL/2AE
W²L/AE

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Theory of Structures
Slenderness ratio of a long column, is

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
Radius of gyration divided by area of cross-section

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