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A piece of material is subjected to a tensile stress of 50 N/mm2 in one direction and compressive stress of 30N/mm2 in a direction perpendicular

A piece of material is subjected to a tensile stress of 50 N/mm2 in one direction and compressive stress of 30N/mm2 in a direction perpendicular to the previous one. Find the stress on a plane the normal of which makes an angle of 30o with 50 N/mm2 stress.

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