[tex]P=20 kW=2*10^4 W\\m=1000 kg=10^3 kg\\G=mg=10^3*10=10^4 N\\L=Gh=10^4*20=2*10^5 J\\P=\frac{L}{t}=>t=\frac{L}{P}=\frac{2*10^5}{2*10^4}=10 s=>t=10 s[/tex]
Răspuns:
Explicație:
m = 1000 kg
h = 20 m
P = 20 kW = 20 000 W
P = L/Δt => Δt = L/P
L = F*d
F = G = m*g
d = h
Δt = (m*g*h)/P
Δt = (1000kg*10N/kg*20m)/20 000 W
Δt = 10 s
