Re: impulse/momentum

[Jim Green <JMGreen@SISNA.COM>]

> This one is from Halliday Resnick and Walker, problem 10.17, which I
> quote:  "A stream of water impinges on a stationary 'dished' turbine blade.

Another puzzlement I see here is why would the turbine blade be
stationary?  Isn't the whole point of the machine to have the turbine blade
rotate?  Further there isn't a chance that the water/bladed collision would
be elastic in any case.  In a real case the water impacts the blade and
does work on the blade -- The blade does work on the water -- the water
heats up and slows down.

I don't see the point of this comic book question.

What did I miss?


Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen