An elementary treatment of the reverse sprinkler

@article{Jenkins2004AnET,
  title={An elementary treatment of the reverse sprinkler},
  author={Alejandro Jenkins},
  journal={American Journal of Physics},
  year={2004},
  volume={72},
  pages={1276-1282}
}
We discuss the reverse sprinkler problem: How does a sprinkler turn when submerged and made to suck in water? We propose a solution that requires only a knowledge of mechanics and fluid dynamics at the introductory university level. We argue that as the flow of water starts, the sprinkler briefly experiences a torque that would make it turn toward the incoming water, while as the flow of water ceases it briefly experiences a torque in the opposite direction. No torque is expected when water is… 
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