Cu wire

Copper wire has a length l = 980 m and diameter d = 8 mm. Calculate the weight if density of copper is ρ = 8500 kg/m3. Result round to one decimal place.

Correct result:

m =  418.7 kg

Solution:

m=Vρ=πr2lρ=π4d2lρ m=π40.0082⋅980⋅8500=418.7 kgm = V \rho = \pi r^2 l \rho = \dfrac{ \pi}{4} d^2 l \rho \ \\ m = \dfrac{ \pi}{4} 0.008^2 \cdot 980 \cdot 8500 = 418.7 \ \text{kg}

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