At 8:32 PM -0400 7/23/98, Rich Kulawiec wrote: >On Thu, Jul 23, 1998 at 04:51:04PM -0400, Nick Schade wrote: >> Take your mind back to your physics class when you were in high school or >> college and think about this. > >I'll be happy to. I went to a lot of physics classes, since I majored >in it. (Caveat: electromagnetism and quantum mechanics were my >strong suit, not fluid dynamics. ;-) ) > Ok, explain how you move the boat without moving the water. My explanation of why you can't I learned in high school. It has nothing to do with fluid dynamics, it is simple Newtonian physics -> F=ma. F is the force applied to the water, m is the mass of the water, a is the acceleration of the water. If the water does not accelerate F=0 and you are not really paddling. That is really all you need to know. If you prefer an electromagnetic example: Imagine the water is coil of wire (a solenoid) and your paddle is a magnet. If you push your magnet into the coil, the only way you will produce a force is if you create a current in the coil. If the coil is an open circuit, no current will be produce and no force will push back on your paddle/magnet. If you add the correct load your magnet will produce a current in the coil which will create an equal and opposite magnetic field striving to support your paddle. This only works as long as your paddle/magnet moves. Nick Schade Guillemot Kayaks c/o Newfound Woodworks, 67 Danforth Brook Rd, Bristol, NH 03222 (603) 744-6872 Schade_at_guillemot-kayaks.com http://www.guillemot-kayaks.com/ >>>>"It's not just Art, It's a Craft!"<<<< *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Fri Jul 24 1998 - 14:30:31 PDT
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