Posted by Zion on Tuesday, April 10, 2012 at 10:28pm.
A stream moving with a speed of 0.5 m/s reaches a point where the crosssectional area of the stream decreases to onefourth of the original area. What is the water speed in this narrowed portion of the stream?

Physics  drwls, Tuesday, April 10, 2012 at 10:32pm
In steady state flow, which this is, the product of velocity and cross sectional area is a constant that is equal to the volume flow rate.
If the cross sectional is reduced to 1/4 the former value, the flow velocity must increase by a factor of 4.
A*V = constant is called the "continuity equation"
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