Question

GENTE AJUDAAAAA VALE PONTO KKKK

Answer 1

a)
$P_u = \frac{W}{\Delta t} = \frac{7200}{120*60} = 1 \ W$

b)
$\eta = \frac{P_u}{P_t} = \frac{1}{1000}\times 100 \% = 0,1 \%$