[latex]d=1000frac{kg}{m^3} [/latex]-gestośc wody [latex]w=50frac{m^3}{s} [/latex] [latex]V=2frac{m}{s} [/latex] [latex]v=1frac{m}{s} [/latex] [latex]n=15[/latex]%=0,15 [latex]m_{(t)}=w*d=1000*50=50000 frac{kg}{s} [/latex] ile kg wody przepływa w 1s [latex]Ek_1=frac{1}{2}mv^2[/latex] [latex]Ek_2= frac{1}{2}mV^2 [/latex] [latex]W=Ek_2-Ek_1[/latex] [latex]W= frac{1}{2}mV^2- frac{1}{2}mv^2= frac{1}{2}m(V^2-v^2) [/latex] [latex]P= frac{W}{t} [/latex] [latex]P= frac{frac{1}{2}m(V^2-v^2)}{t} [/latex] [latex]P=frac{1}{2}m_{(t)}(V^2-v^2) [/latex] [latex]P_e=P*n[/latex] [latex]P_e=frac{1}{2}m_{(t)}(V^2-v^2)*n[/latex] [latex]P_e=frac{1}{2}*50000(2^2-1^2)*0,15[/latex] [latex]P_e=3750*3=11250W=11,25kW[/latex]
