Please wait for the animation to completely load.

The animation is color coded as follows: Blue is water, red is oil, and brown is a wood block initially floating at the interface.  A pump, which starts at t = 1 s, removes the oil.  Which animation is physical?  (In other words, which animation obeys the laws of physics?) Explain.  Restart.

Problem authored by Peter Sheldon and Mario Belloni.
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