Odpowiedź :
[tex]Dane:\\P = 600 \ W\\W = 10 \ kJ = 10 \ 000 \ J\\Szukane:\\t = ?\\\\\\P = \frac{W}{t} \ \ \ |\cdot t\\\\P\cdot t = W \ \ \ |:P\\\\t = \frac{W}{P}\\\\t = \frac{10 000 \ J}{600 \ W}=\frac{10000 \ J}{600 \ \frac{J}{s}}\\\\\boxed{t \approx 17 \ s}[/tex]
Dane
P = 600W
W = 10kJ = 10.000J
Szukane
t = ?
Wzór
[tex]P = \frac{W}{t} | \times t \\ W = P \times t | \div P \\ t = \frac{W}{P} [/tex]
Obliczenia
[tex]t = \frac{10000J}{600W} \approx17s[/tex]