Re: correct answer

[brian whatcott <inet@intellisys.net>]

At 09:10 10/9/97 -0700, you wrote:
> a 12 m long firehose is uncoiled by
> pulling the nozzle end horizontally along a frictionless surface at the
> steady speed of 2.3 m/s.  The mass/length of the hose is 0.25kg/m.
....
> 	Since I'm not a "morning person", have I blundered?
>
> Dr. Mark H. Shapiro


Yes Mark, I consider this a strategic blunder.
A building fire hose normally has water flowing when it is extended
(unlike the fireman's hose).

 If this hose contained water as expected, it would mass 2.5 gram per cm.
That's a mighty narrow hose!

But seriously; there are z-fold hoses and there are drum-coiled hoses,
and you did mention a coil, so (in the non-Galilean manner,) we should 
consider the rotational momentum that has been invoked in the drum...

...now a z-fold hose ought to extend itself with the expenditure of 
negative work...   :-)

Brian
brian whatcott <inet@intellisys.net>
Altus OK