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2r=20 cm
r-10cm
Pp- pole podstawy
Pp= πr²
Pp= 100π
Obj= 10π* 40
Obj=400π cm³
gestosc= masa/objetosc
masa=gestosc * objetosc
m= 400*8,4
m=33,60 π
Ppodstawy=πr²
2r=20cm
r=10cm
H=40 cm
V=πr²H
V=π*10²*40=π*100*40=4000π cm³
4000π*8,4 g=33600π g=33,6π kg