Gravity: a repost

Lets assume earth is sphere
Volume of Earth = Volume of sphere= (4/3) Pi x r^3 = 1.08685 x 10^12  km3
Where r = radius of earth = 6378.135 km
Total volume of water on earth = 1.36 x 10 ^ 9  km3
(For source: check internet or anywhere, its easy) (0.12 % of total volume of earth)

Volume of earth except water  = 1.08549 x 10 ^12 km3

Total mass of earth = 5.98 x 10 ^24 kg (For source: check on internet or anywhere its easy)

Density = mass per unit volume
So total mass of water on earth = density x its volume =  1.36 x 10 ^ 21 (0.021 % of total mass of earth)
Mass of earth except water = 5.97864 x 10 ^24 kg

Let say Mass of earth except water is granite of unit density = 3364 kg/m3 say 3500 kg/m3 (greatest density that exist on earth)
So mass of earth (granite) except water  = density x volume = 3.78 x 10^24 kg
Total mass of earth = Total mass of water + total mass of earth except water = 3.78 x 10^24 kg
Difference between the real mass of earth and the calculated mass = 2.1887 x 10^24 kg ?
Which is 63.57% of the total mass of  5.98 x 10 ^24 so where the rest mass go ?
   
Try this way
Let say
2/3 rd volume on earth is water which should be = 2 x 1.08685 x 10^12 / 3= 7.24 x 10 ^11 km3
1/3rd volume of earth = 1.08685 x 10^12 - 7.24 x 10^11 = 3.62 x 10^11 km3
So total mass of water on earth = Density x its volume= 7.24 x10^23 kg
Mass of earth except water = 5.98 x 10 ^24 - 7.24 x 10^23 = 5.25 x 10^24 kg
density of material which make the earth except water =  5.25 x 10^24 / 3.62 x 10^11 = 1.45 x 10^11 kg/km3 or 14502.76 kg/m3

So what kind of material is this which make the rest mass of earth    

Am I wrong to say that gravity question is still open ?

Please check all above calculation before  answer to this question. May I did some mistake. Thx..

The av. density of the Core is thought to be between 10,000 and 13,000 kg/m^3

"Let say Mass of earth except water is granite of unit density = 3364 kg/m3 say 3500 kg/m3 (greatest density that exist on earth)"

Theres your problem.

PS: I'm not talking to Divito because he/she cares about things like simplifications, misspellings, and syntax.

It's just a lot easier to communicate when it's done accurately and under the same understandings. That's why I choose to point out the things that I do.

Lets assume earth is sphere

There's your problem.

Quote from: L0gic on October 26, 2007, 08:36:21 PM

PS: I'm not talking to Divito because he/she cares about things like simplifications, misspellings, and syntax.

It's just a lot easier to communicate when it's done accurately and under the same understandings. That's why I choose to point out the things that I do.

Not saying that that's a bad thing. Its actually good to have someone attentive to those things in addition to the concepts.

Am I wrong to say that gravity question is still open ?

Lets recheck the Mass of earth
Lets assume earth is sphere as Newton assumed for his Gravitational Law

Volume of Earth = Volume of sphere= (4/3) Pi x r^3 = 1.08685 x 10^12  km3
Where r = radius of earth = 6378.135 km
Total volume of water on earth = 1.36 x 10 ^ 9  km3 (0.12 % of total volume of earth)   
(For source: check internet or anywhere, its easy)

Volume of earth except water  = 1.08549 x 10 ^12 km3

Total mass of earth = 5.98 x 10 ^24 kg (For source: check on internet or anywhere its easy)

Density = mass per unit volume
So total mass of water on earth = density x its volume =  1.36 x 10 ^ 21 (0.021 % of total mass of earth)
Mass of earth except water = 5.97864 x 10 ^24 kor g

Let say Mass of earth except water is granite of unit density = 3364 kg/m3 say 3500 kg/m3 (greatest density that exist on earth)
So mass of earth (granite) except water  = density x volume = 3.78 x 10^24 kg
Total mass of earth = Total mass of water + total mass of earth except water = 3.78 x 10^24 kg
Difference between the real mass of earth and the calculated mass = 2.1887 x 10^24 kg ?
Which is 63.57% of the total mass of  5.98 x 10 ^24 so where the rest mass go ?
   
Try this way
Let say

2/3 rd volume on earth is water which should be = 2 x 1.08685 x 10^12 / 3= 7.24 x 10 ^11 km3
1/3rd volume of earth = 1.08685 x 10^12 - 7.24 x 10^11 = 3.62 x 10^11 km3
So total mass of water on earth = Density x its volume= 7.24 x10^23 kg
Mass of earth except water = 5.98 x 10 ^24 - 7.24 x 10^23 = 5.25 x 10^24 kg
density of material which make the earth except water =  5.25 x 10^24 / 3.62 x 10^11 = 1.45 x 10^11 kg/km3 or 14502.76 kg/m3

So what kind of material is this which make the rest mass of earth    

Please recheck all above calculation before  answer to this question. Thx..

Since when is granite the most dense material on Earth? What we think are most dense objects are limited to whats known to us. We observe material on the surface of the Earth for density. We don't know the density of 'stuff' deeper in the ground. Albeit we can see it gets more compact further down. Surface densities would throw any calcualtions off vastly.