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Problem

A copper refinery produces a copper ingot weighing 70 kg.
If the copper is drawn into wire whose diameter is 7.50 mm,
how many meters of copper can be obtained from the ingot?
The density of copper is 8.94 g>cm3. (Assume that the wire is
a cylinder whose volume V = pr2h, where r is its radius and h
is its height or length.)