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V= 1l
p ulei = 800 kg / m la puterea 3
....... m= ?


Răspuns :

V = 1l = [tex] 10^{-3} m^{3} [/tex]
p = m/V => m = p*V => p=800*[tex] 10^{-3} [/tex] = 0.8 kg
[tex]V=1 \ l=1 \ dm^3=0,001 \ m^3 \\ \rho=800 \ kg/m^3 \\ \boxed{m-?} \\ \bold{Rezlvare:} \\ \boxed{\rho=\frac{m}{V} } \\ \Rightarrow m=\rho \cdot V\\ m=800 \ kg/m^3 \cdot 0,001 \ m^3 \\ \Rightarrow \boxed{m=0,8 \ kg}.[/tex]