After the system calms down from your initial swirling, does the vortex markedly change shape, or does it retain roughly the same shape as the water drains $($neglecting the fact that the vortex will be shrinking vertically$)?(1$ point$)$

Do you notice any other features on the vortex $($ripples$,$ ridges, spirals, etc.$)$ or is it perfectly smooth? $(1$ point$)$

$79$

Are there more rotations per second at the top, middle, or bottom of the vortex? Assume that momentum is conserved. Explain your reasoning. $(2$ points$)$