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A 310-kg chandelier is suspended from vertical steel cable. The cable is 6.9 m long. Assume...

A 310-kg chandelier is suspended from vertical steel cable. The cable is 6.9 m long. Assume a safety factor of 7.5. The elastic modulus for steel is 2.0×1011N/m2, and tensile strength for steel is 5.0×10^8N/m2.

How much does the cable elongate?

I got 4.56*10^-5 for the minimum cross sectional area required

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