*6-80. The polar moment of inertia for the area is Jc = 642 (106) mm4, about the z' axis passing through the centroid C. The moment of inertia about the y' axis is 264 (106) mmª, and the moment of inertia about the x axis is 938 (106) mmª. Determine the area A. y' C Prob. 6-80 200 mm X

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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.