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According to the textbooks, it takes 1 Jule to move a 1 kg object a
distance of 1 meter.
On the other hand, once the object has been moved, keeping it stationary
requires no energy at all. And, indeed, if you take a lump of metal and
put it on your bookshelf, it requires no energy to make it remain there.
It just sits there like a lifeless lump of metal.
Now, here's the thing: How much energy does it take to hold a 1 kg lump
of metal at arm's legnth?
According to physics, it would require 0 Jules. However, to keep the
object stationary against the force of gravity, the muscles in your arm
are having to continually expend chemical energy. But how the **** do
you compute how much energy that is??
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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