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Work is not Imaginary (was Buoyancy is Imaginary)
On Fri, 2 Oct 2009 17:42:17 -0700 (PDT), Frogwatch
wrote: On Oct 2, 8:02*pm, brian whatcott wrote: Goofball_star_dot_etal wrote: ... Hmmmm. a mostly reasonable review - but the idea that force times distance *is not equal to work is somewhat radical, don't you think? I said no work was done *on the (air)plane*. Since we only have the airplane and the air, the work done by the thrust of the engine moving the airplane through a distance all goes into the air as (kinetic) energy or heat in its wake. If I push a sled over snow with force F for distance D it's usually accounted that the work I did ON the sled is F X D ...but I won't beat the topic down.... :-) Brian W In regard to sudden gusts, why not use a breakaway strap like some rock climbers use whose stitches break at some load allowing the sail to be let out all the way. How many boats get knocked down anyway? I mean cruising boats, racers intend to be on the edge. My own boat, a 28' S2, if a sudden gust came up, I'd never be able to hold the tiller and she'd round up into the wind before getting knocked down. Guess again! |
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