physics
posted by Anonymous .
A 1.0 x 103kg house spider is hanging vertically by a thread that has a Young's modulus of 4.2 x 109 N/m2 and a radius of 18 x 106 m. Suppose that a 61kg 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?

σ =Eε
σ=Weight/A
σ₁ =mg/πr²= E₁ε
σ₂=Mg/πR² =E₂ε
(mg/πr²):(Mg/πR²) = (E₁ε):( E₂ε)
R =sqrt[ r²•M•E₁/m•E₂]=….
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