Re: [Phys-l] Glencoe physics: fluid flow

[John Denker <jsd@av8n.com>]

Quoting from Glencoe _Physics: Principles and Problems_

> REVIEWING CONCEPTS
>
> 5.  A river narrows as it enters a gorge.  As the
>     water speeds up, what happens to the water
>     pressure?

Can anybody explain how to answer this question?


In my view, this question seems tailor-made to elicit a rote
misapplication of Bernoulli's principle.  This view is
reinforced by the fact that two inches away (in the other
column on the same page) there is a misstatement of Bernoulli's
principle, ripe for misapplication to this question.

Is it any wonder that students think they can solve problems
by plug-and-chug?



PS FWIW on the same page there is a misstatement of Pascal's
principle, which serves to increase the number of ways of getting
wrong answers.