Hydromechanika

${\displaystyle p_{H}=h_{x}\rho g\,}$

${\displaystyle \tau _{V}=Sw_{1}=Sw_{2}\,}$

${\displaystyle gh_{1}+{\frac {p_{1}}{\rho }}+{\frac {w_{1}^{2}}{2}}=gh_{2}+{\frac {p_{2}}{\rho }}+{\frac {w_{2}^{2}}{2}}}$

${\displaystyle w={\sqrt {2gh}}}$

${\displaystyle \tau _{V}=Sw\,}$

${\displaystyle w_{s}={\frac {2}{3}}{\sqrt {2gh}}}$

${\displaystyle F=ma=\tau _{V}\rho w\,}$