Discussion
Which of the following best describes a free vortex?
Answer: A
A free vortex has a core with an irrotational flow, which is the keyed statement. In a free vortex the fluid rotates without any external force, and the velocity varies inversely with the radius, so the flow outside the core is irrotational. A forced vortex is created by an external force like stirring, and it needs a continuous supply of energy and has a constant angular velocity, so the other three statements belong to the forced vortex.
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