Question

calculati greutatea unui corp din sticla care are volumul de 40 dm cubi

Answer 1

$V=40 \ dm^3=0,04 \ m^3 \\ \rho=2 \ 500 \ kg/m^3 \\ g=10 \ N/kg\\\boxed{G-?} \\ \bold{Rezolvare:} \\ \boxed{G=m \cdot g} \\ \boxed{\rho= \frac{m}{V} } \Rightarrow m=\rho \cdot V \\ m=2 \ 500 \ kg/m^3 \cdot 0,04 \ m^3=100 \ kg \\ G=100 \ kg \cdot 10 \ N/kg \\ \Rightarrow \boxed{G=1 \ 000 \ N}$