Question: A hollow cast iron column whose outside diameter is 200 mm has a thickness of 20 mm. It is 4.5 m long and is

A hollow cast iron column whose outside diameter is 200 mm has

A hollow cast iron column whose outside diameter is 200 mm has a thickness of 20 mm. It is 4.5 m long and is fixed at both the ends. Yield stress of the steel is 550 MPa. Rankine's constant is 1/1600; E is 8x10 MPa and Factor of safety is 1.5. The ratio of Euler's critical load to Rankine's critical load is, (a) 0.81 (b) 1.00 (c) 4.76 (d) 12.56

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