The copper wire has a cross-sectional area of 1 mm2. What is the length of the wire in a coil if its weight is 8.96 kg?

Initial data: S (cross-sectional area of copper wire in a coil) = 1 mm2 (1 * 10-6 m2); m (weight of wire in a coil) = 8.96 kg.

Reference values: according to the condition ρm (copper density) = 8.96 g / cm3 (8960 kg / m3).

1) Determine the volume of copper wire in a coil: V = m / ρm = 8.96 / 8960 = 0.001 m3.

2) Calculate the length of the copper wire: V = L * S, whence L = V / S = 0.001 / (1 * 10-6) = 1000 m (1 km).

Answer: The length of copper wire in a coil is 1 km.