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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