Question

Va rog muuult...multumeesc

Answer 1

O sa notez randamentul cu n .

n=80%

m=2t=2000kg

h=12m

t=48s

g=10N/kg

Lu - lucrul mecanic util

Lc- lucrul mecanic consumat

Lu= mgh= 2000*10*12= 240000J= 240kJ

n= Lu/Lc <=> 80/100=240/Lc=> 80Lc=100*240=> Lc=24000/80=300kJ ( sau 300000 J )

P=Lu/t=240000/48=5000 W = 5kW