[tex]l=8 \ cm=0,08 \ m \\ k=1 \ 000 \ N/m \\ \Delta l=10 \ cm=0,1 \ m \\ g=10 \ N/kg \\ \boxed{\rho-?} \\ \bold{Rezolvare:} \\ \boxed{\rho=\frac{m}{V}} \\ \boxed{G=F_e=m \cdot g} \Rightarrow m=\frac{G}{g} \\ \boxed{k= \frac{F_e}{\Delta l} } \Rightarrow F_e=k \cdot \Delta l =1 \ 000 \ N/m \cdot 0,1 \ m=100 \ N \\ \Rightarrow G=100 \ N \Rightarrow m= \frac{100 \ N}{10 \ N/kg} =10 \ kg \\ \boxed{V=l^3} \Rightarrow V=(0,08 \ m)^3=0,000 \ 512 \ m^3 \\ \rho= \frac{10 \ kg}{0,000 \ 512 \ m^3} [/tex]
[tex]\Rightarrow \boxed{\rho=19 \ 531,25 \ kg/m^3 \to \boxed{Aur }}[/tex]
