Probably a dumb question, but physics was never my strongest subject…. But would the mill at the top have more or less power (torque?) than the one at the bottom?
Assuming the water is still (lake etc) at the top, they will have the same power. The energy you get from the water is the height times weight, and since each mill has the same height for water to fall, they will produce the same.
If you removed all the ones in the middle, then the bottom one would have more power than the top one as the water would fall from higher up building up speed.
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