Water is flowing in a pipe with a circular cross section but with varying cross-sectional area, and at all points the water completely fills the pipe.

(a) at one point in the pipe the radius is 0.260 m. what is the speed of the water at this point if water is flowing into this pipe at a steady rate of 1.20 m^3/s?
(b) at a second point in the pipe the water speed is 3.60 m/s. what is the radius of the pipe at this point?

(a) 5.66 m/s

The flow rate of the water in the pipe is given by

where

Q is the flow rate

A is the cross-sectional area of the pipe

v is the speed of the water

Here we have

the radius of the pipe is

r = 0.260 m

So the cross-sectional area is

So we can re-arrange the equation to find the speed of the water:

(b) 0.326 m

The flow rate along the pipe is conserved, so we can write:

where we have

and where is the cross-sectional area of the pipe at the second point.

Solving for A2,

And finally we can find the radius of the pipe at that point:

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