Sarthaks Test
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A steel rod of length 2l, cross sectional area A and mass M is set rotating in a horizontal plane about an axis passing through the centre. If Y is the Young’s modulus for steel, find the extension in the length of the rod. (Assume the rod is uniform.)

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Consider an element at r of width dr. Let T (r) and T (r+dr) be the tensions at the two edges.

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