Question

Un cub din sticla ca ro=2500kg/mcubi are latura de 1cm. Aflați masa cubului.
Urgeeennnnnntttt! Dau C-O-R-O-A-N-A!

Answer 1

p=2500 kg/m³
l=1 cm--->0,01m
m=?
V=l³
V=(0,01)³=0,000001 m³
p=$\frac{m}{V} =\ \textgreater \ m=p*V\ \textless \ =\ \textgreater \ 2500 kg/m^{3}*0,000001 m^{3}=0,0025 kg$

Answer 2

$\rho=2 \ 500 \ kg/m^3 \\ a=1 \ cm=0,01 \ m \\ \boxed{m-?} \\ \bold{Rezolvare:} \\ \boxed{\rho=\frac{m}{V}} \ \ \ \Rightarrow m=\rho \cdot V \\ V=a^3=(0,01 \ m)^3 \\ V=0,000 \ 001 \ m^3 \\ m=2 \ 500 \ kg/m^3 \cdot 0,000 \ 001 \ m^3 \\ \Rightarrow \boxed{m=0,0025 \ kg}$