Posted by Anonymous on Wednesday, November 16, 2011 at 5:34pm.
sum vertical forces. Let fl be the knife edge left support, and fr be the right support.
fl+fr=80+20 in kg
sum moments about the left knife edge.
0=20kg(50-15-10)+80(50-15)-Fr*70
solve for the force right. then in the other equation lf.
Now in newtons, multiply by 9.8, kg is not a force.
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