[tex]m=360 \ g=0,36 \ kg \\ \Delta l=6 \ cm=0,06 \ m \\ \rho=2 \ 700 \ kg/m^3 \\g=10 \ N/kg \\ \boxed{k-?} \\ \boxed{V-?} \\ \bold{Rezolvare:} \\ \boxed{\rho=\frac{m}{V}} \ \ \ \ \Rightarrow V=\frac{m}{\rho} \\ V= \frac{0,36 \ kg}{2 \ 700 \ kg/m^3} \\ \Rightarrow \boxed{V=1,33 \cdot 10^{-4} \ m^3} \\ k=\frac{F_e}{\Delta l} \\ F_e=G=m \cdot g \\ F_e=G=0,36 \ kg \cdot 10 \ N/kg \\ F_e=3,6 \ N \\ k=\frac{3,6 \ N}{0,06 \ m} \\ \Rightarrow \boxed{k=60 \ N/m}[/tex]
