Question

Calculati energia totala a unei berze de 20 kg care zboara cu 10m/s la 300 m înălțime ​

Answer 1

Răspuns:

$\bf\purple{E_{totala}=59920\:J}$

Explicație:

${\bf\red{\boxed{E_c=\frac{m\times v^2}{2}}}}\\\\E_c=\frac{20\:kg\times10^2\:\frac{m}{s}}{2}=\frac{\not20\times100}{\not2}=1000\:J$

${\bf\red{\boxed{E_{p\:g}=m\times g\times h}}}\\\\E_{p\:g}=20\:kg\times9,82\:\frac{m}{s^2}\times300\:m\\E_{p\:g}=6000\times9,82=58920\:J$

${\bf\red{\boxed{E_{totala}=E_c+E_{p\:g}}}}\\\\E_{totala}=1000\:J+58920\:J=\bf\purple{59920\:J}$