Moon and buildings to make energy?

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Offline brainzlol

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Moon and buildings to make energy?
« on: 04/01/2013 12:53:01 »
Does the moon have a pulling effect on a big object, like a building?
I know it attracts the sea to make tides.
What if a skyscraper was built on pistons (moving freely)?  Would the moon pull and
release the building, thereby moving the pistons to create energy?
Mike from:
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« Last Edit: 04/01/2013 13:21:56 by peppercorn »


Offline syhprum

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Re: Moon and buildings to make energy?
« Reply #1 on: 04/01/2013 21:39:18 »
I am sure you could obtain some energy in this manner but I shudder to think what the cost per MW of the generator would be.


Offline CliffordK

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Re: Moon and buildings to make energy?
« Reply #2 on: 05/01/2013 00:25:43 »
I could imagine a spring system under a large building allowing it to move with the solar and lunar tides.  Japan, of course, has some extreme earthquake suspension systems built into many of their buildings already.  But, about how much would it produce?

Ok, the diurnal change in gravity on Earth due to the sun and moon is about 2 Ám/s2.

The (previous) World Trade Center Towers weighed somewhere on the order of 500,000,000 kg


F = ma
m = 500,000,000 kg
a = 2 Ám/s2 = 2 x 10-6 m/s2 = 0.000002 m/s2

So, F = ma = 500,000,000 kg * 0.000002 m/s2 = 1000 kgm/s2 = 1000 Newtons

1 newton = 0.2248 pounds

So, you end up with a difference of about 225 lbs, occurring twice a day.

Work, of course, = Force x Distance, with the distance being something pretty small.

Anyway, you would be much better off attaching a dynamo to a single bench press machine in the gym in the building.

Or, you could think of it as the force exerted by 1 or 2 people entering or leaving the building (which otherwise has an occupancy of thousands).
« Last Edit: 05/01/2013 02:47:34 by CliffordK »