Salut.
Cunoastem formula urmatoare:
[tex]\boxed{E_{c}=\frac{m \cdot v^{2}}{2}}[/tex], unde:
Din formula asta reiese ca:
[tex]m \cdot v^{2} = 2 \cdot E_{c}[/tex]
[tex]\displaystyle{\rightarrow m = \frac{2 \cdot E_{c}}{v^{2}}}[/tex]
Transformam in unitatile de masura din Sistemul International.
v = 20 km/h = 20 × 1000 m/3600 s = 5,55 s
Ec = 300 MJ = 300 × [tex]10^{6}[/tex] J
[tex]\displaystyle{\rightarrow m = \frac{2 \cdot 300 \cdot 10^{6}}{5,55^{2}}}[/tex]
[tex]\displaystyle{m=\frac{600 \cdot 10^{6}}{30,8}}[/tex]
m = aprox. 19480519 kg
Deci spargatorul de gheata are masa egala cu 19480519 kilograme sau 19480 tone
- Lumberjack25
