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Physics

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A 1.1 x 10-3-kg house spider is hanging vertically by a thread that has a Young's modulus of 4.5 x 109 N/m2 and a radius of 16 x 10-6 m. Suppose that a 81-kg person is hanging vertically on an aluminum (Young's modulus 6.9 x 1010 N/m2) wire. What is the radius of the wire that would exhibit the same strain as the spider's thread, when the thread is stressed by the full weight of the spider?

Thanks in advance..

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