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PRACTICE / Efflux speed

Speed from a pressure head

A small hole is 1.8 m below the water surface of a large open tank.

Find the ideal exit speed.

Organize the givens & assumptions
  • head = 1.8 m
  • g = 10 m/s²

Large open reservoir, small hole, negligible surface speed and viscous losses; g = 10 m/s²; atmospheric pressure at surface and jet.

  1. A36 m s−136\ \mathrm{m\,s^{-1}}
  2. B18 m s−1\sqrt{18}\ \mathrm{m\,s^{-1}}
  3. C18 m s−118\ \mathrm{m\,s^{-1}}
  4. D6 m s−16\ \mathrm{m\,s^{-1}}

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