john <
johnse...@gmail.com> writes:
>Michael says
>"
>Your explanation of the enormous torque needed to cause them to precess
>is....? "
>YOUR explanation of the enormous
>torque needed to make them ROTATE is?
You need to learn simple mechanics.
No torque needed to keep something rotating at a constant angular
momentum. The ordinary laws of gravity and the laws of
conservation of angular momentum is what's needed to explain it.
Meanwhile, a precessing spinny thing starts spinning in one plane
but now precessing it requires the torque to produce an angular
acceleration to change the _direction_ of the rotation, and thus
the angular momentum. Remember, angular momentum is a conserved
quantity.
>It takes no torque at all in the special
>cases where the precession is
>a WHOLE NUMBER times the rotation.
That is so very, very wrong. Pulling crap like that from your
ass is no way to do physics.
Simple mechanics: T = Ia where T is the torque, I is the moment
of inertia and a is the angular acceleration. In the case of
your precession obsession, a is an angular acceleration at right
angles to the rotational axis.
>Since every point in the matter finds
>itself back at the same place once
>every full rotation, all energy debts are cancelled
>wrt the precession.
Not sufficient. You need a torque that would go in a
cycle, first in the x direction, then in the y direction,
then -x, then -y, then x...
It doesn't matter if over a cycle the sum is zero. You need
a varying torque over each cycle!
Where does this torque come from?
What about the violation of angular momentum?
You have no answer!
>Prove this ain't so. Or go silent,
See above. Or prove it for yourself. Get a gyroscope, get it
spinning and try to precess it. Feel the force? That is its
opposition to you applying a torque to it to get it rotating
in a different direction when you try to precess it.
Since you are obsessed with spinny things, I figure you must have
a dozen or two gyroscopes to play with.
[p.s. As much as you hate them, Big Pharma has some very good
medicines to help with your OCD. You should talk to your doctor
about it. No, I did NOT say to go visit Little Pharma!!!]
>like when I say that evidence of
>order at one size level proves
>order for them all
You never made any such proof!