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h=16cm
d- srednica grafitu
d=2mm=0,2cm
V=Ppxh
V=πx(0,2)²x16
V=0,04πx16
V=0,64cm³
1cm³ =2,3g
0,64cm³=x
x=0,64x2,3/1
x=1,472g (waga grafitu w olowku)