The copper wire

The copper wire bundle with a diameter of 2.8mm weighs 5kg. How many meters of wire are bundled if 1m3 of copper weighs 8930kg?

Correct answer:

l =  90.9 m

Step-by-step explanation:

D=2.8 mm m=5 kg ρ=8930 kg/m3  r=D/2=2.8/2=57=1.4 mm r2=r m=r:1000  m=1.4:1000  m=0.0014 m m S=π r22=3.1416 0.001426.1575106 m2  m = ρV m = ρ S l  l =  ρ Sm l=ρ π r22m=8930 3.1416 0.001425=90.9 m



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