[tex]Dane:\\V = abc = 2 \ m\times 4 \ m\times 10 \ m = 80 \ m^{3}\\d = 2000\frac{kg}{m^{3}}\\g = 10\frac{N}{kg}\\Szukane:\\F = ?[/tex]
Rozwiązanie
[tex]\underline{F = m\cdot g}\\\\ale:\\\\d = \frac{m}{V} \ \ \rightarrow m = V\cdot d\\\\m = 80 \ m^{3}\cdot2000\frac{kg}{m^{3}} = 160 \ 000 \ kg\\\\F = 160 \ 000 \ kg\cdot 10\frac{N}{kg}\\\\\boxed{F = 1 \ 600 \ 000 \ N = 1 \ 600 \ kN = 1,6 \ MN}\\\\1 \ kN = 1000 \ N\\1 \ MN = 1 \ 000 \ 000 \ N[/tex]