Odpowiedź :
[tex]1.\\Dane:\\s=20m\\W=300J\\\\Szukane:\\F=?\\\\Wzory:\\W=F*s|:s\\\frac{W}{s} =F\\F=\frac{W}{s} \\\\\\Rozwiazanie:\\F=\frac{300J}{20m} =15N\\\\[/tex]
[tex]2.\\Dane:\\m=12kg\\W=300J\\\\Szukane:\\F=?\\s=?\\\\Wzory:\\F=m*g\\\\W=F*s|:F\\\frac{W}{F} =s\\s=\frac{W}{F} \\\\\\Rozwiazanie:\\F=12kg*10\frac{m}{s^{2} } =120N\\\\s=\frac{300J}{120N} =2,5m[/tex]
[tex]3.\\55kJ(*1000)=55000J \\2MJ(*1000000)=2000000J\\0,06kJ(*1000)=60J\\845kJ(*1000)=845000J\\[/tex]
[tex]4.\\Dane:\\P=300W\\t=0,5min=30s\\\\Szukane:\\W=?\\\\Wzory:\\P=\frac{W}{t} |*t\\P*t=W\\W=P*t\\\\Rozwiazanie:\\W=300W*30s=9000J[/tex]
[tex]5.\\Dane:\\P=25kW=25000W\\t=1h=60min=3600s\\\\Szukane:\\W=?\\\\Wzory:\\P=\frac{W}{t} |*t\\P*t=W\\W=P*t\\\\Rozwiazanie:\\W=25000W*3600s=90000000J[/tex]
[tex]6.\\Dane:\\m=2kg\\h=50cm=0,5m\\g=10\frac{m}{s^{2} }\\\\Szukane:\\E_{p} =?\\\\Wzory:E_{p} =m*g*h\\\\\\Rozwiazanie:\\E_{p} =2kg*10\frac{m}{s^{2} } *0,5m=10J[/tex]
[tex]7.\\Dane:\\m=70kg\\E_{p} = 14kJ=14000J\\g=10\frac{m}{s^{2} } \\\\Szukane:\\h=?\\\\Wzory:\\E_{p} =m*g*h|:m*g\\\frac{E_{p} }{m*g} =h\\h=\frac{E_{p} }{m*g} \\\\\\Rozwiazanie:\\h=\frac{14000J}{70kg*10\frac{m}{s^{2} } } =20m[/tex]
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