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A hollow circular bar having an outside diameter twice the inside diameter is used as a beam. from the bending moment diagram of the beam,

A hollow circular bar having an outside diameter twice the inside diameter is used as a beam. from the bending moment diagram of the beam, it is found that the bar is subjected to a bending moment of 40 km. If the allowable bending stress in the mean is limited to 100 MN/m^2. Find the inside diameter of the bar.

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