Re: Angular momentum

In article <[EMAIL PROTECTED]>,
Timtro <[EMAIL PROTECTED]> wrote:
>I'm sorry to bother you all with this question. I was just playing around
>with a problem I found in a book. It is a simple problem where in a man sits
>on a stoll free to ratate without friction and is spun around while he holds
>two 3kg weights. we are given the moment of inertia of the man+stool,
>initial speed and the fact that the weights are 1m from the axis of
>rotation. The man then contracts his arms to 0.3m from the axis of rotation.
>Obviously the man will go faster because of this, but when I calculated the
>initial and final kinetic energies, they were VERY differant. Where did all
>that extra energy come from? Or did I calculate the energy wrong?

Did you recalculate the moment of inertia when the man changed the 
distribution of his masses?

-- 
"Let us learn to dream, gentlemen, then perhaps we shall find the 
truth... But let us beware of publishing our dreams before they have been 
put to the proof by the waking understanding." -- Friedrich August Kekulé