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## Homework Statement

http://puu.sh/frpk5/eae7bce2e3.png [Broken]

## Homework Equations

v = sqrt(T / (m / L));

## The Attempt at a Solution

7.86 g / cm^3 = 7860 kg / m^3

T = v^2 * m/L

T = 160 ^ 2 * 7860 which is a huge number

I have no idea where the diametre plays a part.

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