Question

cum se rezolva problema : cutie
l=15 cm
h=2 cm
m=63 kg
densitatea=0,7g/cm cub
afla: volumul=?
L=?

Answer 1

$l=15 \ cm=0,15 \ m \\ h=2 \ cm=0,02\ m \\ m=63 \ kg \\ \rho=0, 7 \ g/cm^3=700 \ kg/m^3 \\ \boxed{V-?} \\ \boxed{L-?} \\ \bold{Rezolvare:} \\ \boxed{\rho= \frac{m}{V}} \\ V=L \cdot l \cdot h \\ \Rightarrow V= \frac{m}{\rho}= \frac{63 \ kg}{700 \ kg/m^3} \\ \Rightarrow \boxed{0,09 \ m^3} \\ \Rightarrow L= \frac{V}{l \cdot h } = \frac{0,09 \ m^3}{0,15 \ m \cdot 0,02 \ m } = \frac{0,09 \ m^3}{0,003 \ m^2} \\ \Rightarrow \boxed{L=30 \ m}$