Question

buna!va rog mult sa ma ajutati.daca puteti...ms

Answer 1

$Greutatea \ corpului \ este \ G=mg=5N.$

$\Delta l=\frac{1}{E}*\frac{F*l_0}{S}$

$F=G$

$S=2cm^2=0,0002m^2=2*10^{-4}m^2$

$\Delta l=\frac{1}{10^6}*\frac{5*1}{2*10^{-4}}=\frac{5}{2*10^2}=\frac{5}{200}=0,025m$

$l=\Delta l+l_0=1,025m$

$\sigma=\frac{F}{S}=\frac{5}{2*10^{-4}}=25000N/m^2$