Bob, I agree that It becomes difficult to relate to real life when one discusses rotational energy as you seem to imply. In classical physical systems it is not too difficult to convert linear kinetic energy into rotational energy. Of course the total closed system linear momentum and angular momentum need to be conserved separately and do not convert.
This is not to suggest that a linearly moving object could not impart angular momentum to a pair of rotating disks for example. It just so happens that an equal and opposite amount of angular momentum is imparted to them such that the net sum is zero. Some find this situation difficult to grasp. Your concept about a minimum energy quanta is interesting but how would that be explained in the case of extremely low frequencies where the F approaches zero in the equation E=h*F? Perhaps the spin quanta that follows your rule may only apply to atomic systems? Dave -----Original Message----- From: Bob Cook <frobertc...@hotmail.com> To: vortex-l <vortex-l@eskimo.com> Sent: Tue, Mar 15, 2016 11:50 am Subject: [Vo]:Re: EM Drive(s) Dave— People do not like to go there when it comes to the equivalence of spin angular momentum and other forms of energy. Since spin has a minimum associated with the Planck constant, it suggests a minimum quanta of energy also IMHO. I know of no explanation along these lines however. Bob Cook From: David Roberson Sent: Tuesday, March 15, 2016 7:33 AM To: vortex-l@eskimo.com Subject: Re: [Vo]:Re: EM Drive(s) Notice that I had an etc. at the end of that short list! The poor guy ran into the wall as it was speeding in his direction. It also happens that the Earth spins a little bit faster or perhaps slower than before the car's acceleration to absorb some of that original energy. It can get complicated very quickly if we add considerations of rotational energy to the discussion. I'd rather not go there. Dave -----Original Message----- From: mixent <mix...@bigpond.com> To: vortex-l <vortex-l@eskimo.com> Sent: Tue, Mar 15, 2016 12:07 am Subject: Re: [Vo]:Re: EM Drive(s) In reply to David Roberson's message of Mon, 14 Mar 2016 20:56:31 -0400: Hi, [snip] >Trick question. All of the energy used by the electric drive could be >accounted for from the frame of the car by observing frictional losses, wind >movement, heat emissions, etc. It would not be easy to calculate, but the >information should be there. > >Dave Try convincing the driver, that is now in hospital because he drove into a concrete wall at high speed, that all of the stored energy was lost to wind resistance and road friction. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
