Question

find the length of 13.2 kg of a copper wire of diameter 4mmif 1cu cm of copper wire weight 8.4g

Answer 1

volume of copper wire=mass/density
=13.2/8.4x 10^-3
=1.5714 x 10^3 cm^3

now volume of wire =22/7 x (0.2)^2 xL
where L is length of wire .
1.5714 x 10^3 cm^3=3.14 x 0.04 x L
L=12.51 x10^3 cm