Question

Need help, please.

A copper wire (density = 8.96 g/cm^3) has a diameter of 0.25 mm. If a sample of this copper wire has a mass of 22 g, how long is the wire?


Thank you.
diameter = .025 cm

area = pi D^2/4= 4.91 * 10^-4 cm^2
so
4.91*10^-4 * L * 8.96 = 22
L = 5002 cm
or L = 50 meters

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