Question

In fiecare secol pompa ridica 20 de litri.Inaltimea de 10 metri.Ce lucru se efectiuaza intr-o ora.De aflat lucrul.

Answer 1

1 secol=20 l
1 secol=100 ani=0,02 m cub
1 an=365 zile≈5,48 m cub
1 zi=24 ore≈0,23 m cub
1 ora≈0,0005 m cub
g=10 N/kg
ρ apei=1000 kg/m cub
h=10 m
L=F*d
F=G
G=m*g
m=ρ apei*V
m=1000 kg/m cub*0,0005 m cub
m=0,5 kg
G=0,5 kg*10 N/kg
G=5 N
F=5 N
d=h
d=10 m
L=5 N*10 m
L=50 J.