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Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].
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Rotating fluid with a hole
The radial velocity energy will be equal to the total liquid height above the hole, thus the radial velocity $v=\sqrt {2g(H+z)}$.
Detailed energy balance:
The problem statement indicated the hole size …