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**Equivalent length of of column ??**

## Homework Statement

A Mild steel column has a cross section of 100 mm by 50 mm . Assuming a safety factor of 6 calculate the load that it can safely support?

## Homework Equations

Rankines formula : W = Oc/K[1+a(AEe^2/I]

## The Attempt at a Solution

My problem is with Ee = Equivalent length of column in millimetres

How do I find this value as the question does not give a length?

Thanks for any advice