The minimum condition ensuring that the water does not fall out of the bucket is centripetal force of the bucket must be equal to sum of tension on the rope and weight of the bucket [tex]( \frac{mv^2}{r} = T + mg )[/tex].
The tension on top of a vertical circle is given as follows;
[tex]T = F_c - W\\\\T = \frac{mv^2}{r} - mg[/tex]
[tex]T + mg = \frac{mv^2}{r}[/tex]
where;
Thus, the minimum condition ensuring that the water does not fall out of the bucket is centripetal force of the bucket must be equal to sum of tension on the rope and weight of the bucket.
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