1 [latex]t=20s[/latex] [latex]W=240J[/latex] [latex]P= frac{W}{t}= frac{240}{20}=12W [/latex] 2 [latex]m=40g=0,04kg[/latex] [latex]v=36 frac{km}{h}=10 frac{m}{s} [/latex] [latex]Ek= frac{1}{2}m*v^2= frac{1}{2}*0,4*10^2=0,2*100=20J [/latex] 3 [latex]m=100kg[/latex] [latex]h=2km=2000m[/latex] [latex]g=10 frac{m}{s^2} [/latex] [latex]Ep=m*g*h=100*10*2000=2000000J=2000kJ=2MJ[/latex]
[latex]Zad 1:\ Dane:\ t=20s\ W=240J\ Szukam:\ P=?\ Rozwiazanie: P=frac{W}{t}=frac{240}{20}=12W\ \ Zad 2:\ Dane:\ m=40g=0,04kg\ v=36frac{km}{h}=10frac{m}{s}\ Szukam:\ E=?\ Rozwiazanie:\ E=frac{1}{2}mv^2=frac{1}{2}*0,04*10^{2}\ \ E=2J[/latex] [latex]\ \ Zad 3:\ Dane:\ m=100kg\ h=2km=2000m\ gapprox10frac{m}{s^2}\ Szukam:\ E=?\ Rozwiazanie:\ E=mgh=100*10*2000\ \ E=2000000J=2000kJ[/latex]