[tex]\tt Se~da: \\ \\
V_{1}=0,1l=0,0001m^{3}\\ \\
\rho_{1}=1000\frac{kg}{m^{3}}(Sint~sigur~ca~e~1000~nu~100)\\ \\
V_{2}=500cm^{3}=0,0005m^{3}\\ \\
\rho_{2}=800\frac{kg}{m^{3}}\\ \\
\rho=?\frac{kg}{m^{3}}\\ \\ \\
Formule:\\ \\
\rho=\frac{m}{V}\\ \\
\rho=\frac{m_{1}+m_{2}}{V_{1}+V_{2}}\\ \\
\rho=\frac{V_{1}\times\rho_{1}+V_{2}\times\rho_{2}}{V_{1}+V_{2}}\\ \\ \\
Calcule:\\ \\
\rho=\frac{0,0001\times1000+0,0005\times800}{0,0001+0,0005}=833,(3)\frac{kg}{m^{3}}\\ \\[/tex]
[tex]\tt Se~da: \\ \\
G=5N\\ \\
l=5cm=0,05m\\ \\
g=10\frac{N}{kg}\\ \\
\rho=?\frac{kg}{m^{3}}\\ \\ \\
Formule:\\ \\
\rho=\frac{m}{V}\\ \\ \\
G=m\times g\\ \\
m=\frac{G}{g}\\ \\ \\
V=l^{3}\\ \\ \\
\rho=\frac{G}{g \times l^{3}}\\ \\ \\
Calcule:\\ \\
\rho=\frac{5}{10 \times 0,05^{3}}=4000\frac{kg}{m^{3}}[/tex]
