Question

Determinati puterea unei masini care ridica de 120 ori pe minut un ciocan cu masa de 200 kg la inaltimea de 0,75 m
Urgent dau coronit

Answer 1

$n=120 \ ori \\ m=200 \ kg \\ h=0,75 \ m \\t=1 \ min=60 \ s\\ g=10 \ N/kg \\ \boxed{P_n-?} \\ \bold{Rezolvare:} \\ \boxed{P=\frac{L}{t}} \ \ \ \ P_n=120P \\ L=F \cdot d=G \cdot h \\ G=m \cdot g \\ G=200 \ kg \cdot 10 \ N/kg=2 \ 000 \ N \\ L=2 \ 000 \ N \cdot 0,75 \ m \\ L=1 \ 500 \ J \\ P=\frac{1 \ 500 \ J}{60 \ s} \\ P=25 \ W \\ P_n=120 \cdpt 25 \ W \\ \Rightarrow \boxed{P_n=3 \ 000 \ W=\bold{3 \ kW}}$