sci.physics.electromag

On Mar 21, 6:58=A0pm, "Robert J. Kolker" wrote:
> maxwell wrote:
>
> > Not at all. =A0Pulleys etc rely on a theory of gravity that IS linked to=

> > our macro sensations of effort. =A0Incidentally, why do our muscles get
> > tired when they hold up a weight that never moves? =A0No displacement,
> > no work, no energy - right?
>
> Wrong. It tekes sugar metabolism to produce tension in the muscle that
> produces the counterforce to gravitation. There is no net work on the
> outside, but there is chemical work applenty to make the muscles do
> their thing.
>
> Have you noticed how supericial your thinking is?
>
> Bob Kolker
Please, Bob, I'm not unconscious. Of course I know my muscles get
tired. The point was to illustrate that physics does NOT explain the
need for the biochemical activity. Back to the books...