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?

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