Question

Dau multe puncte! Ajutor! 57.

Answer 1

$\displaystyle L\rightarrow latura~cubului\\ \\L=10~cm=0,1~m\\ \\ \rho=0,5~\frac{g}{cm^3} =500~\frac{kg}{m^3} \\ \\ k=200~\frac{N}{m}\\ \\ F_e=k\Delta l\\ \\ \rho =\frac{m}{V}\Rightarrow m=\rho V \\ \\ V=L^ 3 \Rightarrow V=(0,1)^3\Rightarrow L=0,001~m^3\\ \\m=\rho V\Rightarrow m=500\cdot0,001 \Rightarrow m=0,5~kg\\ \\G=mg\Rightarrow G=0,5\cdot 10\Rightarrow G=5~N\\ \\ F_e=G=5~N\\ \\F_e=k\Delta l \Rightarrow \Delta l=\frac{F_e}{k} \Rightarrow \Delta l =\frac{5}{200} \Rightarrow \mathbf{\Delta l=0,025~m}$