Date: Thu, 16 Sep 2004 11:15:25 -0400

Author: sampere

Subject: Re: Water cart Vote


See, I missed that too, the pipe is at one end of the cart. I pictured
the pipe in the center.

But... If the wall pushes the water one way, say toward the right end,
then you're saying the cart must move to the left. Am I correct?

But, doesn't the pipe need to exert a force on the water to stop prevent
it from moving to the right? Now all the forces cancel and there's no
net force.

No need to apologize Andy. When you're wrong, you're wrong. So where am
I wrong above?



A Gavrin wrote:

> I am with Bill on this one (sorry Sam).
> The cart doesn't move up because gravity pulls it down, and the normal
> force of the ground adjusts to suit while the water is in transit.
> Similarly, the walls of the cart provide a force on the water inside.
> It seems to me that the force provided by the wall opposite the drain
> must be slightly larger force than the one near the pipe, in order to
> move the CM of the water towards the pipe. The water produces a
> correspondingly larger reaction force against that wall than the one
> near the pipe.
> I vote offline earlier, so don't count my vote twice!
From Thu Sep 16 11:20:30 2004