A Copper Refinery Produces A Copper Ingot Weighing 170. Lb. If The Copper Is Drawn Into Wire Whose Diameter Is 8.00 Mm, How Many Feet Of Copper Can Be Obtained From The Ingot? The Density Of Copper Is 8.94 G/cm3.

The mass of one foot of 8mm wire will be given by the volume times the density. The volume is the area times the length.
  Mass = (area*length)*density
  = ((π/4)*(8 mm)^2)*(12 in*(25.4 mm/in))*(1 cm/(10 mm))^3*(8.94 g/cm^3)
  = (π*8^2*12*25.4*8.94/(4*10^3) g
  = 43.598592π g
  ≈ 136.969 g

1 pound is 453.59237 grams, so 170 lb = 77,110.7029 g
  77110.7029 g/(136.969 g/ft) ≈ 562.98 ft