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A stell rod of length 2l corss sectiona...

A stell rod of length 2l corss sectional area A and mass M is set rotating in a horizotnal plane about an axis passing through its cnetre and perpendicular to its length with constant angular velcoty `omega.` If Y is the Young's modulus for steel, find the extension in the lenght of the rod. (Assume the rod is uniform.)

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