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Wadsworth_McStumpy t1_j5puj23 wrote

It depends on whether you stir with the same linear velocity or the same angular velocity.

The coffee cup is about 9 inches around, and if you stir it once per second, the coffee is moving at 9 inches per second. In a 26 foot pool, 9 inches per second will barely move the water, and it will stop almost as soon as you lift the spoon.

On the other hand, if you stir the pool at one stir (360 degrees) per second, the water will be moving at 980 inches per second (55 miles per hour!), and will keep moving for a very, very long time.

Also, that will probably generate enough outward force to destroy your pool. (I'm too busy to calculate the force right now, but if somebody else wants to, I'd be interested to see it.)

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delventhalz t1_j5q5u9v wrote

Even if the linear velocity of the pool is the same, that is a lot more mass moving at that same velocity. It would have much more momentum and take longer to slow.

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