[tex]l=10 \ cm=0,1 \ m \\ p=2 \ 700 \ Pa \\ g=10 \ N/kg \\ \boxed{m-?} \\ \boxed{\rho-?} \\ \bold{Rezolvare:} \\ \boxed{G=F_n=m \cdot g} \Rightarrow m= \frac{F_n}{g} \\ \boxed{p= \frac{F_n}{S} } \Rightarrow F_n=p \cdot S \\ S=l^2 =(0,1 \ m)^2=0,01 \ m^2 \\ F_n=2 \ 700 \ Pa \cdot0,01 \ m^2=27 \ N \\ m= \frac{27 \ N}{10 \ N/kg} \\ \Rightarrow \boxed{m=2,7 \ kg} \\ \boxed{\rho=\frac{m}{V}} \\ V=l^3=(0,1 \ m)^3=0,001 \ m^3 \\ \rho=\frac{2,7 \ kg}{0,001 \ m^3} [/tex]
[tex]\Rightarrow \boxed{\rho=2 \ 700 \ kg/m^3 \to \boxed{Aluminiu}}} [/tex]
