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H=0,2km=200m=20000 cm
r=2 mm=0,2 cm
1cm³ miedzi waży około 8,9g
V=πr²*H
V=π*0,2² * 20000=800π ≈ 800*3,14 ≈ 2512 cm³
2512 * 8,9 ≈ 22356,8 g