10lb=4540g approx. 1in=2.54cm approx. 0.0808 in=0.2052cm approx. Radius of wire=0.1026cm. Cross-sectional area of wire=π(0.1026)²=0.03308sq cm approx.
Density=mass/volume, volume=0.03308x cc, where x is the length in cm.
Mass=4540g, so density 2.70=4540/0.03308x, and x=4540/(2.70×0.03308)=50829cm=50829/100=508.29m.