you cant get an isolated system to acquire a rotation by itself
false:
http://www.youtube.com/watch?v=C4DfSBnBR08
The subject is an isolated system, which you've chosen to redefine.Originally posted by raaaid:
thats evident
but cant you consider taking into account the free axel as the guys and wheel an isolated system?
seems your deviating the subject
edit:
interesting concept this of wheel of death to build a perpetum mobile![]()
"A system that does not interact with its surroundings, that is, its total energy and mass stay constant."
As was clearly demonstrated, the men added mass, muscle, momentum and inertia to affect changes. They worked, they expended energy, they would be incapable of performing forever.
I'm not deviating, I'm correcting an erroneous assumption. But rather than questioning your own assumption, all of physics must be wrong...![]()
BY DEFINITION an "isolated system" CONSERVES MASS AND ENERGY. If any individual system does not do so, THEN IT IS NOT AN ISOLATED SYSTEM.
An "isolated system" DOES NOT EXIST IN REALITY. It can be approximated but never achieved.
Simply enclosing some volume with an imaginary boundary does not suddenly make it an "isolated system".
Regardless, momentum can do whatever it wants inside the system, it's energy that must be conserved. In this case, taking the initial state of the system as the total energy of the humans you can approximate a closed system. Some of the energy of the humans is transferred to the wheel. Much is lost as heat due to friction (in the bearings and aerodynamic drag). More is lost to heat in the conversion from chemical to mechanical. If you capture every Btu of heat lost by the humans and all the mechanical losses, it will equal the energy that was imparted to the wheel (to speed it up and slow it down). Of course there is work expended on the support frame to hold it in place but, like I said, it's an approximation.
--Outlaw.
the truth is im unsure cause in the end this is like a hamster wheel
but an isolated system BOTH energy and momentum are conserved
for example in the isolated system the universe is net momentum is zero and you cant change this
but this guys control at will the momentum of a quite isolated system, just lake a running hamster![]()
Correct me if I'm wrong but those guys scarfed down several hot dogs before they started doing the work and therefore the system isn't isolated because in fact several hot dogs were consumed and their energy is now being put to good use... yes ?Originally posted by raaaid:
the truth is im unsure cause in the end this is like a hamster wheel
but an isolated system BOTH energy and momentum are conserved
for example in the isolated system the universe is net momentum is zero and you cant change this
but this guys control at will the momentum of a quite isolated system, just lake a running hamster![]()
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