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2014-01-14T22:52:16+02:00
F=?
m=1kg
l=2m
h=40cm=0.4m
br+bf=2
0.4+bf=2
bf=2-0.4=1.6
R=G=m*g=1 kg*10N/kg= 10N
FsupraR=br supra bf=Fsupra 10=0.4supra1.6⇒F=10*0.4supra1.6=10 supra 4=2.5N
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