Ile waży aluminowa kulka o średnicy 2 cm, jeżeli gęstość aluminium wnosi 2,7g/cm^{3}? Przyjmij, że \pi\approx3,14.
v kuli = 4/3 π*r*r
r=1cm, wiec v= 4/3*3,14[cm^{3}]
masa= 4/3*3,14*2=8,37(3)g
m=?
d=2,7g/cm³
π≈3,14
2r=2cm|:2
r=1cm
V=4/3πr³
V=4/3*3,14*(1cm)³
V≈4,19cm³
d=m/v|*v
m=d*V
m=2,7g/cm³*4,19cm³
m≈11,3g
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v kuli = 4/3 π*r*r
r=1cm, wiec v= 4/3*3,14[cm^{3}]
masa= 4/3*3,14*2=8,37(3)g
m=?
d=2,7g/cm³
π≈3,14
2r=2cm|:2
r=1cm
V=4/3πr³
V=4/3*3,14*(1cm)³
V≈4,19cm³
d=m/v|*v
m=d*V
m=2,7g/cm³*4,19cm³
m≈11,3g