A coil of copper wire with a cross section of 2mm squared has a mass of 17.8kg. How to determine the length without unwinding the coil? And why is she equal?
Initial data: S (cross-section of copper wire in a coil) = 2 mm2 (2 * 10-6 m2); m (wire coil weight) = 17.8 kg.
Reference values: ρm (copper density) = 8900 kg / m3.
The length of the copper wire in the coil is determined from the equality: L * S = V = m / ρm, whence L = m / (S * ρm).
Calculation: L = 17.8 / (2 * 10-6 * 8900) = 1000 m.
Answer: The length of copper wire in a coil is 1000 meters.
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