the magnet is doing work by not falling to the ground.
mathlete said:Does QM work at low velocities? If not, what makes QM more "correct" than Newton?
No. Thats completely different. First off, its not a machine....T@P said:and yet light moves on its own at an unchanging speed forever. doesnt this contradict alot of things? isnt it also a sort of pmm?
bino, if you're really serious, google the definition of "work."bino said:the magnet is doing work by not falling to the ground.
GAWB said:You're an imbecile.
bino said:sorry i used the wrong analogy a magnet does work by pulling metal toward it.
Mk said:The Brownian Rachet is a perpetual motion machine postulated by Richard Feynman in a physics lecture at the California Institute of Technology on May 11, 1962 as an illustration of the laws of thermodynamics.
The device consists of a gear with a ratchet, that vibrates under Brownian motion (hence the name) in a heat bath. The idea is that motion in one direction is allowed by the ratchet, and motion in the opposite direction is prevented. Thus, it might be reasoned, the gear will rotate with a small force continuously in one direction.
How does this not work?
Maxwell's http://en.wikipedia.org/wiki/Maxwell's_demon]Demon.[/PLAIN] [Broken]siddharth said:I have another situation. Consider a cylinder filled with some gas at a given temperature. At the end of the cylinder is a glass door. On the other side of this door is another cylinder at a much higher temperature. Operating the glass door is a man. (Note that the man is indeed a part of the system). It is known that different molecules of the gas have different velocities. What the man does is that whenever a really fast molecule comes, he opens the door. But when a slower molecule comes he does nothing. Also he makes sure that no molecule from the second piston enters the first. Thus all the fast molecules are now transferred to the second piston and the temperature further increases. Does this not disobey the laws of entropy?
You are (now) quite right. But what has this to do with Perpetual Motion?bino said:sorry i used the wrong analogy a magnet does work by pulling metal toward it.
i am wrong about it just sitting on the fridge.
The_Thinker said:I'm just curious, why is it that anye perpetual motion machine that is thought up is discarded immedietly. I know that energy can't be created nor can be destroyed but then again, a few centuries we were absolutely positively sure that the Earth was flat! I mean anything can be wrong, why newton's law's itself was proved wrong and we still learn them in school! How can we be so sure that it can't possibly work!!! Can someone clear this out for me?
What you are saying makes no sense. Imagine you have a big magnet on a truck, attracting a vehicle behind you. It's true that this vehicle can get an infinite number of miles per gallon. But the truck gets corresponding worse mileage. Magnetic fields are not some kind of magic. It would operate in exactly the same way as if the vehicle were being pulled by a rope. You are essentially saying that if you connect a number of masses with ropes with stored energy (OK, say bungee cords), then you think it's possible to invent a configuration where all the masses move forever. OK now the concept seems silly doesn't it?bino said:but if you were able the set them up in such a way so that the magnets are always being pushed or pulled for as long as the magnets have they power. then you could get free energy.