Earth balance.

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Earth balance. Empty Earth balance.

Post  Nightjar on Wed Apr 08, 2020 9:40 am

Maybe you can answer this one Adrian?
For many years this question has been floating around in my brain.
As we all know the wheels on our car have to be balanced to prevent irregular rotation and tyre wear.

"Why doesn't the earth get out of balance with the transfer of billions of tonnes of mining from one side of the earth to the other?"




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Post  deutran on Wed Apr 08, 2020 10:00 am

Maybe the ocean balances it out.
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Post  davsgold on Wed Apr 08, 2020 10:24 am

we send our good iron ore to China, (otherside of the world) they send back rubbish to our side of the world (rebalance) Laughing

I know what your saying Nighjar, keep stacking stuff on one side of a boat and what happens Shocked
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Post  adrian ss on Wed Apr 08, 2020 10:50 am

The earth weighs approx 10 x 10 to the 24th power kilo grams. = approx  1000,000 000, 000 000,000 000. imp tons
The earth rotates very slowly in relation to its size so yes the shifting of surface mass can toss the planet out of balance but you would have to move a lot more than what we dig out of the ground to upset our little world. Like we are nothing  more than mould on the surface as far as the earth is concerned.

Scratching a hole in the ground at Mt Tom price and transferring a bit of iron ore to the other side of the world is going to make sfa difference to the rotating balance of the earth.

How often does a sizeable rock get stuck in the tread of a tyre while rotating extremely fast in relation to the wheel diameter and you notice only the sound of the rock whacking on the bitumen while driving. Annoying as all get out but the wheel does not get noticeably out of balance.

You can calculate the effects of objects of differing weights and diameters impacting the earth here:
https://impact.ese.ic.ac.uk/ImpactEarth/cgi-bin/crater.cgi?dist=1000&distanceUnits=1&diam=10&diameterUnits=2&pdens=&pdens_select=3000&vel=17&velocityUnits=1&theta=90&wdepth=&wdepthUnits=1&tdens=2500
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Post  geof_junk on Wed Apr 08, 2020 7:57 pm

40,075 km
Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). However, from pole-to-pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.               If 40,075 km is divided 24 hr for one rotation the surface at the equator is 1667 kmh. Is that slow Smile  I have seen some of the world largest mines in the southern hemisphere and when you compare them to the land area it is tiny. Just use google earth and zoom out from them and see how quick they disappear into nothing. I agree with Adrain answer.


Last edited by geof_junk on Wed Apr 08, 2020 8:25 pm; edited 1 time in total
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Post  tony p on Wed Apr 08, 2020 8:21 pm

mass

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Post  moredeep on Wed Apr 08, 2020 9:17 pm

that's on sunday Laughing Laughing Laughing
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Post  adrian ss on Thu Apr 09, 2020 8:08 am

tony p wrote:mass

Very true. Mass is everything where gravity is concerned.

If you jam a 1 oz rock in the tyre tread of your car it will throw the balance out just the same as a physically smaller 1 oz lump of lead  would do.
But if you placed that same rock or bit of lead in the tread of a monster truck tyre ( waaay larger in diam and much greater mass) it is not  going to upset the balance at all.
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Post  Nightjar on Thu Apr 09, 2020 10:40 am

Thanks Adrian, So our earth is spinning slowly with out any problems, how about the tilt alignment, could the earth capsize (Davsgold mentioned a boat) and we end up in the Northern hemisphere?







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Post  Axtyr on Thu Apr 09, 2020 10:55 am

I did hear a theory about 30 years ago that the earth was slowing due to the large number of dams being built. It doesn't look like it panned out to anything, and certainly not causing the earth to wobble. UNLESS, that is what is causing climate change.

Regards Axtyr.

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Post  adrian ss on Thu Apr 09, 2020 11:10 am

I am not so sure that you can liken the earth to a rotating gyroscope.
The axis of a gyro are fixed in bearings and any out of balance forces acting on the gyro are transferred to the bearing points and that can tip? topple a gyro over.
The earth is not attached to anything other than gravity and if these grav forces change enough ( like a rogue planet passing close by ) it could in theory topple the earth over or as the core cools and solidifies maybe that could form an out of balance that could tilt the earth more than it already is.
The earth is already wobbling significantly In any case we need not worry for a mill years or so.
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Post  granite2 on Thu Apr 09, 2020 5:09 pm

I remember back when the Three Gorges dams were being built. The greenies went ape shiit. Shocked They reckoned all that water caught in one place would cause the earth to be out of balance and cause a wobble. lol!

I never lost any sleep of it but I guess a lot of greenies had trouble sleeping for a long time. Rolling Eyes
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Post  bicter on Thu Apr 09, 2020 5:12 pm

adrian ss wrote:I am not so sure that you can liken the earth to a rotating gyroscope.
The axis of a gyro are fixed in bearings and any out of balance forces acting on the gyro are transferred to the bearing points and that can tip? topple a gyro over.
   The earth is not attached to anything other than gravity and if these grav forces change enough ( like a rogue planet passing close by ) it could in theory topple the earth over or as the core cools and solidifies maybe that could form an out of balance  that could tilt the earth more than it already is.
The earth is already wobbling  significantly In any case we need not worry for a mill years or so.

Adrian, when do you reckon the N/S poles are due to flip next Smile https://futurism.com/earths-magnetic-poles-overdue-switch
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Post  adrian ss on Thu Apr 09, 2020 5:58 pm

Dunno mate. Soon....In astronomical time. Very Happy
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