Se da :
Randamentul (Notat cu litera Eta )=80%
h1=40cm=0,4m
m=120 kg
Forta activa (Fa)=500N
h2..?
Rezolvare :
Lu= Fgr*h1
Ltot=Fa *h2
h2=Fgr*h1*100%= Randamentul*Fa *h2⇒h2 =Fgr *h1/Randament * Fa *h2 &100%=Mg *h1*100%/Randament * Fa ⇒1200N*10N*0,4m/80%*500N ⇒h2=1,2 m
R/s:h2=1,2m