Question

v= 51 cm cubi =0,00051 mcubi
s= 2000 kg /m cubi

Answer 1

51cm³ = 51·10⁻⁶m³ = 0,000051m³ (mai mic de 10 ori decat scrie enuntul!!!)
2000kg/m³ = 2kg/dm³ = 2g/cm³

Answer 2

$V=51 \ cm^3=0,000 \ 051 \ m^3 \\ \rho=2 \ 000 \ kg/m^3 \\ \boxed{m-?} \\ \bold{Rezovare:} \\ \boxed{\rho=\frac{m}{V}} \\ m=\rho \cdot V \\ m=2 \ 000 \ kg/m^3 \cdot 0,000 \ 051 \ m^3 \\ \Rightarrow \boxed{m=0,102 \ kg=\bold{102 \ g}}$