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An iron square hollow tube with outer side of 50mm, inner side 40mm and 6m in length is subjected to a tensile load of

An iron square hollow tube with outer side of 50mm, inner side 40mm and 6m in length is subjected to a tensile load of 180kN. Young's Modulus of steel is 200kN/mm, calculate : a. the stress in the tube; b. the elongation that the tube will be stretched.

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