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h=0,2 cm
3,14*10*10*0,2*8,4=527,52 gram
Czyli odpowiedź b.
P=π*(10cm)^=3,14*100cm^=314cm^
V=314cm^*2mm=314cm^*0,2cm=62,8cm³
d=m/v
m=d*v
m=8,4g/cm³*62,8cm³=527,52g
czyli odpowiedź B