An aluminum (E 70 GPa) column built into the ground as shown in the figure below. Its length, L, is given as 2.2 m, and it is under axial compressive load P. The dimensions of the cross-section are b 210 mm and d 280 mm.. What is the critical load to buckle the column?

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Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.