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m=d*v
a) dPb = 11,3 g/cm3
V=20cmx15cmx10cm = 3000 cm3
m= 3000 cm3* 11,3 g/cm3
m= 33900 g
b) dZn = 7,14g/cm3
V=20cmx15cmx10cm = 3000 cm3
m= 3000 cm3* 7,14 g/cm3
m= 21420 g
2. a^3 = V sześcianu
d=m/v
V sześcianu = 8 cm3
m = 71,36 g
dCu = 71,36 g / 8 cm3
dCu = 8,92 g/cm3