Mostly what I'm after are the factors I need to know to do the problem.
Imagine we're in the days of Leonardo Da Vinci. And pizza is everyone's favorite food. And there's a river that goes on forever. Along the river, I build a water wheel that powers my pizza factory.
Then downstream I build another one.
Then another one.
What I managed to learn already from a similar question is that the water in the river had potential energy. Then as it moves along, it has kinetic energy, which is transferred to the wheel. After it passes the water wheel, the kinetic energy is less; it moves slower. If I just measure how much slower the river is moving after each water wheel, will that tell me how many more I can make?
Is a water wheel's take of kinetic energy the only thing affecting the kinetic energy of the river afterward?
Or are there still other factors that allow me to build more/less water wheels? But that doesn't seem right because it seems like the water would pick up speed again if the river were at the same incline before and after the wheel. But that would mean the only thing limiting me is the water loss from evaporation, and the length of the river, and that doesn't seem right either.