Some major errors and misconceptions here.
1) Use 9.8 m/s^2 for labs
2) A few are still using the mass of the washers x ac even though it is the stopper and not the washers that are accelerating.
3) A few of you have totally confused yourselves. Pay attention to this.
The stopper is not in equilibrium: IT IS ACCELERATING! [ After all, you just told me what ac is and it sure was not zero.]
FTension does NOT CANCEL Fc; IT IS Fc! and we are trying to see if FTension from Mwashers x g does indeed equal the Fc from Mstopper omega squared r. Again, FTension doesn't cancel Fc; FTension is providing Fc.
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