# 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:

$m = V \rho = \pi r^2 l \rho = \dfrac{ \pi}{4} d^2 l \rho \ \\ m = \dfrac{ \pi}{4} 0.008^2 \cdot 980 \cdot 8500 = 418.7 \ \text{kg}$

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