All Questions
88
questions
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votes
1
answer
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How does the Earth rotate, given that the torque acting on it while revolving is zero?
I've come to understand that the torque acting on the Earth while revolving the Earth is zero. Torque is the force responsible for rotation of a body. So how does the Earth rotate?
- 7
43
votes
8
answers
85k
views
If the gravity at the center of the Earth is zero, why are heavy elements like iron there?
If gravity is zero at the center of the earth, why is there a core of heavy elements, such as iron?
Alternate question for the opposite hypothesis:
If gravity is greatest at the center of the earth,...
- 449
3
votes
2
answers
10k
views
Infinity problem: Why is gravity $g=0$ zero at the center of Earth if according to Newton gravity formula $g=GM/R^2$? [duplicate]
It is said that value of $g=0$ at the centre of the Earth. $g$ is calculated using the formula
$$ g=G*M/R^2.$$
When $R = 0$, $g$ approaches infinity. I have two ...
- 41
3
votes
2
answers
273
views
Why is the inside of the Earth hot?
How does the Earth's internal heat exist? Is it available from its creation as collision heat? Or is there any other source feeding the heat to the core?
- 694
20
votes
5
answers
136k
views
Why is Earth's gravity stronger at the poles?
Many sources state that the Earth's gravity is stronger at the poles than the equator for two reasons:
The centrifugal "force" cancels out the gravitational force minimally, more so at the equator ...
- 517
2
votes
2
answers
10k
views
Gravity beneath sea level [duplicate]
This is a very simple question, but I can't find an answer anywhere.
Earth's gravity at sea level is 1 (approximately 9.8m/s^2)
What happens being under sea level in a cavern/chasm/ravine, how much ...
- 121
2
votes
2
answers
144
views
What is the value of $g$ at centre? [duplicate]
What is the value of $g$ at the centre of the Earth? Is it zero or infinity?
My attempt: I know it's zero but applying law made me on fused.
- 1,847
2
votes
0
answers
82
views
Could there be a planet just as the Earth, but bigger?
Could there be a planet twice or thrice the size of Earth but while being the same? and by the same I mean, hosting the same life as Earth, having a day last 24 hours and a year 365 days.
Basically, ...
2
votes
1
answer
585
views
Why is the Earth shaped like a sphere and not any other shape: cube, prism? [duplicate]
Why is the earth shaped like a sphere and not any other shape: cube, prism?
- 39
1
vote
3
answers
376
views
Is the Earth round? [duplicate]
Imagine you are a common man and want to prove that the Earth is Round, how would you prove it without any mathematical derivation or without the theory of the ships.
- 53
5
votes
3
answers
931
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Gravitational force of the Earth [duplicate]
Why does gravitational force of the Earth decrease as we move towards the centre of the Earth? Where as inverse square rule says that distance is less than gravitational force is more.
- 51
0
votes
1
answer
238
views
Does gravity act in the centre of the Earth? [duplicate]
If we we dig a hole from north pole to the south pole of the Earth and we throw a ball in this hole where would it stop? Will it come back on the surface or it will stop at the centre?
- 21
2
votes
2
answers
81k
views
Why does gravity decrease as we go down into the Earth? [duplicate]
We all know that gravity decreases as the distance between the two increases. Hence
$$ F = G \frac{Mm}{r^2}. $$
Hence the acceleration due to gravity
$$ g =\frac{F}{m}= G \frac{M}{r^2} $$
...
- 53
1
vote
2
answers
422
views
Could the Earth have a dark matter core as well as a disk?
If it is established that the Earth does have a dark matter disk as this recent discovery suggests.
http://www.newscientist.com/article/mg22129503.100-gps-satellites-suggest-earth-is-heavy-with-dark-...
- 2,421
0
votes
3
answers
1k
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Why is there no gravity in the center of a celestial body, yet there is gravity on the surface? [duplicate]
I've heard few explanations, but none in good detail that make it clear to those with less mathematical knowledge on the equations of complex physics.
I would like to think that since you are on the ...
