Big try at gravity wheel

[MarkE]

hi nfeijo

Other possibilities he try to raise his popularity or other business with this giant, failure could be the small risk, but i still believe gravity can perfom usefull work. 

The useful work that can be extracted from gravity here on earth is in tidal power harvesting.  The relative movement of the moon cyclically pulls on the enormous volume and mass of the seas.  Harvesting the tides would only very slightly slow down the rotation of the moon around the earth.

[camelherder49]

What exactly causes water to fall over a dam onto a turbine?

[TinselKoala]

What exactly causes water to fall over a dam onto a turbine?

How exactly did the water get up there in order to be able to fall over a dam onto a turbine?

You aren't starting your problem in the right place. The cycle goes like this: 1. Water is in the ocean. 2. Sun evaporates water. 3. Convection causes clouds and wind. 4. Water vapor is carried up to the mountains by clouds and wind. 5. Rainfall from high clouds in mountains fills up reservoirs. 6. When reservoir is full enough, water falls over the dam onto the turbine. 7. Water runs down the river to the ocean.

Lather rinse repeat.


Now, you are in a position to ask and answer your question: What causes water to fall over the dam onto the turbine? And the answer should be very clear: the energy from the Sun causes the water to fall over the dam onto the turbine, and the energy extracted by the turbine comes from the only energy supply into the hydrologic cycle: THE SUN.

[MarkE]

What exactly causes water to fall over a dam onto a turbine?

Sunlight.

[MileHigh]

Our Sun creates E = 3.9E+26 joules of energy every second. To balance the books, every second the Sun destroys m = E/c^2 = 4.3E+9 kilograms of mass. This mass loss, equivalent to more than 4 million tons per second, is accomplished by fusing 600 million tons of hydrogen into 596 tons of helium. 

They call me Encyclopedia Brown!