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V=(4/3)*π*r³ r=2mm=0,2cm
masa 1 kulki m=d*(4/3)*π*r³=11,3*(4/3)*3,14*0,2³=0,3842 g
1 kulka --------0,3842 g ołowiu
x kulek --------1000 g ołowiu
x=2602,8
odp. Można odlać 2602 kulki z 1kg ołowiu