So if you could extract useful energy from the earth's rotation it would mean it is possible to violate the conservation of angular momentum.
Harry On Sun, Feb 9, 2014 at 8:48 PM, David Roberson <dlrober...@aol.com> wrote: > As you say, the rotation rate of the Earth can be modified by devices > located on the earth. The issue is that whatever you use to modify that > rotation must not change the overall angular momentum of the system which > includes the Earth and that device. For example the bullet fired by the > gun below could change that rotation rate until it comes to rest again on > the Earth. Of course, the rate could be changed if the bullet does not > return to the exact same location as it began if you really want to get > technical. Remember, it is angular momentum that is conserved, not > rotation rate alone. The location of the bullet at rest might lead to a > different moment of inertia for the system. > > Dave > > > > -----Original Message----- > From: H Veeder <hveeder...@gmail.com> > To: vortex-l <vortex-l@eskimo.com> > Sent: Sun, Feb 9, 2014 8:09 pm > Subject: Re: [Vo]:: RAR gravity engine > > Yes, but those laws do not prohibit the Earth's rotation from being > slowed (or quickened) by means located only on the Earth. (e.g. on a > smaller scale a satellite's spin can be slowed by using the built in > control thrusters.) Those laws only say it is impossible to generate useful > energy from the Earth's rotation by means only located on the Earth. > > Harry > > On Sun, Feb 9, 2014 at 6:46 PM, David Roberson <dlrober...@aol.com> wrote: > >> Strange as it may seem, any activation force or torque is going to >> result in a reaction that keeps the total momentum in balance. When a >> bullet is fired from a gun momentum is conserved since the gun is driven >> backwards with an amount of momentum equal to that carried away by the >> bullet. The gun is much heavier than the bullet so it recoils at a far >> lower velocity. In this case the energy imparted upon the bullet is much >> greater than that delivered to the gun since energy is proportional to >> velocity squared. That is a good reason to have a heavy weapon. :-) >> >> Angular momentum works in a similar manner. The key thing to remember is >> that both linear and angular momentums are conserved. Any force you >> generate is matched by a reaction force of equal and opposite magnitude. >> >> Dave >> >> >> >> -----Original Message----- >> From: H Veeder <hveeder...@gmail.com> >> To: vortex-l <vortex-l@eskimo.com> >> Sent: Sun, Feb 9, 2014 5:37 pm >> Subject: Re: [Vo]:: RAR gravity engine >> >> The initial momentum of the pendulum does not have to come from the >> rotation of the earth. >> It could come from some chemical energy such as a muscle or a bomb. >> >> Harry >> >
