10 cm = 0,1 m
5 cm= 0,05 m
2 cm=0,02 m
a)
[tex]V=0,1*0,05*0,02=0,0001 m^{3}[/tex]
[tex]p =\frac{m}{V}=> m_{Fe} =7869*0,0001=0,786kg \\\\m_{2} =1,676-0,786=0,89kg\\[/tex]
b)
[tex]p=\frac{m_{2}}{V} =\frac{0,89}{0,0001} =8900kg/m^{3}[/tex]
p - reprezinta desitatea
