# The force it applies.

Figure above 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 $$r_{A} = 7$$ $$cm$$ and $$r_{B} = 4$$ $$cm$$ from the axle. Initially the stoppers touch the walls without being compressed. Then force $$\vec{F}$$of magnitude $$220$$ $$N$$ is applied perpendicular to the rod at a distance $$R = 5$$ $$cm$$ from the axle. Find the magnitude of the force compressing Stopper A.

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