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Why we not get attracted by pyramid ?

by joyever
Tags: attracted, pyramid
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joyever
#1
Aug9-11, 09:15 AM
P: 14
pyramid have much mass than us than why we are not attracted by them?
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Doc Al
#2
Aug9-11, 09:17 AM
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Quote Quote by joyever View Post
pyramid have much mass than us than why we are not attracted by them?
Why do you think you aren't attracted to them? You're attracted by all mass.
joyever
#3
Aug9-11, 09:18 AM
P: 14
no its wrong if i m standing slightly away from pyramid i will not get attracted to it...

russ_watters
#4
Aug9-11, 09:20 AM
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Why we not get attracted by pyramid ?

You may not feel it, but you are attracted to it.
Doc Al
#5
Aug9-11, 09:21 AM
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Quote Quote by joyever View Post
no its wrong if i m standing slightly away from pyramid i will not get attracted to it...
Sure you will.
phinds
#6
Aug9-11, 10:53 AM
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It sounds like you need to study the fundamentals of gravity, unless the issue is that you think that the mass of a pyramid has special properties BECAUSE it is a pyramid, and if that is the case then you are off into crackpottery.
audiologies
#7
Aug9-11, 01:48 PM
P: 7
Do some math dude. Force due to gravity equals (G*m1*m2)/r^2

Great pyramid of Giza: Mass = 5,900,000,000 kilograms
Height: 139 meters
Base: 230 meters

If you walk up to the middle of one side you are 123 meters from the center of gravity.

F = 6.67*10^-11 * 75kg * 5.9*10^9 kg / 123^2

F = .002 Newtons

Feel that dude?
AlephZero
#8
Aug9-11, 02:13 PM
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Quote Quote by audiologies View Post
F = .002 Newtons

Feel that dude?
If you use a pyramid the size of a moutain, then you can measure it, even if you can't "feel" it. http://en.wikipedia.org/wiki/Schiehallion_experiment
audiologies
#9
Aug10-11, 03:09 PM
P: 7
Cool experiment, thanks for the link!
Studiot
#10
Aug10-11, 04:52 PM
P: 5,462
You may like to know that this was how Mt Everest was discovered by westerners.

During the survey of India in the 1800 it was observed that the plumb bobs of the surveying instruments hung slightly off vertical to the North and it was concluded that there must be a large mountain range to the north to cause this.

Geologically speaking, Mt Everest is a pyramid peak.

go well
phinds
#11
Aug10-11, 05:08 PM
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Quote Quote by Studiot View Post
You may like to know that this was how Mt Everest was discovered by westerners.

During the survey of India in the 1800 it was observed that the plumb bobs of the surveying instruments hung slightly off vertical to the North and it was concluded that there must be a large mountain range to the north to cause this.

Geologically speaking, Mt Everest is a pyramid peak.

go well
Interesting, but what I would find more interesting is to know how they determined that the plumb bob was off vertical. What did they use to establish vertical?
Bloodthunder
#12
Aug10-11, 08:52 PM
P: 174
Quote Quote by phinds View Post
Interesting, but what I would find more interesting is to know how they determined that the plumb bob was off vertical. What did they use to establish vertical?
Definitely not a plumb bob XD
mathfeel
#13
Aug10-11, 08:54 PM
P: 181
Quote Quote by phinds View Post
Interesting, but what I would find more interesting is to know how they determined that the plumb bob was off vertical. What did they use to establish vertical?
The Wiki page linked above says they used certain heavenly body.
DaveC426913
#14
Aug10-11, 09:30 PM
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In conclusion, audiologies is correct in doing the measurement.

You do feel a pull from the pyramid - it is just very small compared to the pull of the Earth.

Note that you do not feel this pull "sideways" - in case that's what you are expecting. One only feels the net pull of gravitational forces - you will feel a pull down like normal, just slightly off vertical - but again, too small to feel. Though not too small to measure.
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Studiot
#15
Aug11-11, 02:53 PM
P: 5,462
Interesting, but what I would find more interesting is to know how they determined that the plumb bob was off vertical. What did they use to establish vertical?
Mathematics.

They measured vertical angles and the angles of the observed vertical triangles did not add up to 180. The only explanation was that the 'vertical' reference (the plumb line) was in fact leaning.

There is an interesting recent book by John Keay called

The Great Arc

which describes this.

go well


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