Centrifugal-force magnitude is $mv^2/r$ and weight is mg. Mass cancels, leaving $F_c/F_g=v^2/(rg)=18^2/(.25\cdot9.8)=132.244898$. Rounded to two decimals, the dimensionless ratio is **132.24**. Convert the radius from 25 cm to .25 m before substitution.
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