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dane: S=1cm2, m=3,16kg, d=7,875kg/dm3, walec
szukane: l
m = d*V ale dla walca V = S*l
m = d*S*l a stąd
l = m/[d*S] = 3,16kg/[7,875kg/dm3*1*10^-4m2] = 4000m = 4km
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