Question: A both ends hinged cast iron hollow cylindrical column 3 m in length has a critical buckling load of P kN. When the column

A both ends hinged cast iron hollow cylindrical column 3 m in

A both ends hinged cast iron hollow cylindrical column 3 m in length has a critical buckling load of P kN. When the column is fixed at both the ends, its critical buckling load rises by 350 kN more. If the ratio of external diameter to internal diameter is 1.28 and E = 100 GPa, the external diameter of the column is mm.

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