Theory of Structures
A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm², the bending strain energy stored in the bar, is

411 N mm
511 N mm
611 N mm
711 N mm

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Theory of Structures
Pick up the correct statement from the following:

The moment of inertia is calculated about the axis about which bending takes place
If tensile stress is equal to axial stress, the section experiences compressive stress
If tensile stress is less than axial stress, the section experiences compressive stress
All of these

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