Question: How does the fluid velocity through a pipe change if the radius of the pipe decreases to ( 1 ) / ( 3 ) its

How does the fluid velocity through a pipe change if the radius of the pipe decreases to (1)/(3) its original radius?
The velocity increases by a factor of three.
The velocity increases by a factor of nine.
The velocity decreases by a factor of three.
The velocity decreases by a factor of nine.

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