Copper wire

What is the mass of 500 m of copper wire with a diameter of 1 mm, if ρ = 8.9 g/cm ^ 3?

Correct result:

m =  3.495 kg

Solution:

l=500 m cm=500 100  cm=50000 cm D=1 mm cm=1/10  cm=0.1 cm r=D/2=0.1/2=120=0.05 cm p=8.9 g/cm3 V=π r2 l=3.1416 0.052 50000392.6991 cm3 m1=p V=8.9 392.69913495.0218 g m=m1 kg=m1/1000  kg=3495.0218/1000  kg=3.495 kg



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