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walnuts
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Homework Statement
Figure 12-61 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances rA = 7.0 cm and rB = 3.2 cm from the axle. Initially the stoppers touch the walls without being compressed. Then force of magnitude 110 N is applied perpendicular to the rod at a distance R = 5.6 cm from the axle. Find the magnitude of the force compressing (a) stopper A and (b) stopper B.
The distance R is between the axle and stopper A.
Homework Equations
torque=(radius)*(force)
torque(net)=0
The Attempt at a Solution
For statics I usually pick a pivet point, but since there is an axle will I have to use that as reference?
using the stopper at rB as the pivet point.
Fb= force on stopper b
Fa=force on stopper a
F=applied force
Fb*(rB) + F*(rB+R)-Fa*(rA+rB)=0
F*(rB+R)=Fa*(rA+rB)
(F*(rB+R))/(rA+rB)=Fa
Fa-F=Fb
and it's wrong. [/b]
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