Question

O macara ridica uniform la inaltimea de 14 m un corp de masa de 350 kg in 20 de secunde(g=10 N/kg).
Calculati lucrul mecanic motor si puterea mecanica motorului macaralei.
Va rogggggg.Blizzzzzzzzzzz

Answer 1

h=14 m
m=350 kg
t=20 s
g=10 N/kg
Lm=?
P=?
L=F*d
In cazul nostru , h=d si F =G
G=m*g
G=350kg*10N/kg=3500N
Lm=G*h
Lm=3500N*14m=49.000J
L=49.000J
Aflam puterea:
$P= \frac{L}{t} = \frac{49.000J}{20s} =2450W ~ deci~ P=2450W$