Copper wire

What is the weight in kg of copper wire 200 m long with a diameter of 0.6 cm, if the density of copper is 8.8 kg?

Correct result:

m =  49.7628 kg

Solution:

l=200 m→ dm=200⋅ 10  dm=2000 dm D=0.6 cm→ dm=0.6/10  dm=0.06 dm ρ=8.8 kg/dm3  V=π⋅ (D/2)2⋅ l=3.1416⋅ (0.06/2)2⋅ 2000≐5.6549 dm3  m=ρ⋅ V=8.8⋅ 5.6549=49.7628 kg

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