Question

o macara cu puterea 8,82kw a ridiicat un corp cu masa de 4.5 tone la inaltimea de 8 metri.in cat timp a facut aceasta lucrare?? se da g=9.8N/kg

Answer 1

$P=\frac{L}{t}=\textgreater t=\frac{L}{P}=\frac{mgh}{P}=\frac{4500kg*9,8N/kg*8m}{8820W}=40s$