For the free vortex flow the velocities are (v_{t}=5 / r) and (v_{r}=0). Assume that lengths are

Question:

For the free vortex flow the velocities are $v_{t}=5 / r$ and $v_{r}=0$. Assume that lengths are in feet or meters and times are in seconds. Plot the streamlines of this flow. How does the velocity vary with distance from the origin? What is the velocity at the origin $(0,0)$ ?

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