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972 pi cm3 = 3,054 dm3
V*ϱ = 3,054 dm3 * 960 g/dm3 =2931,84 g
w innym przypadku wykorzystaj wzór
V=4/3 * pi * r3
i analogicznie oblicz ciężar
9-r
v=4/3pi*r^3
v=3,054 dm3
3,054 dm3 * 960 g/dm3 =2931,84 g