I know about Law of conservation of energy - but this one beats me. Can we add a motor on one side coupled with a piston and pull the line on the pulley system and add a dynamo on the other side? And use a loopback to give part of its power to the motor?
2006-08-20 17:34:29 · 6 answers · asked by Subu S 2 in Science & Mathematics ➔ Physics
Won't work. Calculate the tension on the pulley cabling, multiply by its speed to get the power, and you'll see that you only get half the power out that you put in.
2006-08-20 17:43:50 · answer #1 · answered by Anonymous · 0⤊ 0⤋
I think you are missing the key point of mechanical advantage. The electric motor puts out a certain amount of power. Power equals torque times rotational velocity. If you gear up with a pulley system you get more rotational velocity (r.p.m.) at the expense of torque. If you gear down you get more torque and less rotational velocity. In both cases the power stays the same.
In real life there are inefficiencies to consider also. The motor puts out less rotational power than it consumes in electrical power and the generator produces less electrical power than it consumes in mechanical power. The rest of the energy is turned into heat and electromagnetic noise.
2006-08-20 17:57:53 · answer #2 · answered by selket 3 · 0⤊ 0⤋
your conclusion is incorrect. you can add an electric motor to a 1/4 pully system as usual.
2006-08-20 17:41:40 · answer #3 · answered by lovely 1 · 0⤊ 0⤋
There is no free energy.
2006-08-20 17:45:00 · answer #4 · answered by Dr M 5 · 0⤊ 0⤋
1st law of thermodynamics...what you are describing (I believe) is an over unity device.
2006-08-20 17:41:36 · answer #5 · answered by boredjessie2003 2 · 0⤊ 0⤋
Actually it works. But the oil companies will have you killed if you try to patent it.
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2006-08-20 17:44:07 · answer #6 · answered by hudef 2 · 0⤊ 0⤋