All Questions
88
questions
0
votes
2
answers
754
views
The shortest path among two points inside Earth [closed]
I have this idea and I don't know how to process, explain or question it. I hope you can understand these images and help me formulating a good question.
This is like a gravitational train but it ...
24
votes
11
answers
12k
views
Backyard experiments to falsify the Flat Earth theory [duplicate]
I recently became aware that the flat Earth theory still exists in the 21st century, and has colored the views of a friend of mine. Roughly speaking, the tenets are:
The Earth is a flat disk, with ...
- 371
0
votes
2
answers
105
views
Can we decrease the value of $g$ (gravitational pull) without gaining height? [closed]
The value of $g$ on earth surface is $9.8\ \text{m/s}^2$ and when we gain height, then the value of $g$ decreases. Pilots experience same phenomena in air, but can we decrease the value of $g$ by ...
0
votes
1
answer
120
views
Is there any way to create a globe with gravitational or similar attractive force - earth simulator?
This may sound like a dumb question.
Is there anyway to create a miniature version of earth or its gravitational force.
A globe or sphere which have force inside it which can attract the things ...
- 109
14
votes
4
answers
2k
views
What is the general relativity explanation for why objects at the center of the Earth are weightless?
The idea that as you move through the earth you get a symmetric cancelling of gravitational acceleration which approaches zero acceleration due to gravity at the center of the earth makes a lot of ...
- 1,039
2
votes
2
answers
136
views
Why are the cores of planets melted?
We all know that the core of Earth is in liquid form, as are most other planets as recently read.
Why is this the case? Obviously, high temperatures are the cause, but what causes the high ...
- 21
3
votes
2
answers
2k
views
What exactly will happen if a small planet collides with Earth?
This is a video of a simulation of Ceres (a dwarf planet) hitting Earth at 2000km/s.
What strikes me the most, is how fast the shockwave is moving. It takes about 6 minutes for the shockwave to pass ...
- 1,270
4
votes
3
answers
2k
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Are we increasing the gravity of Earth with our population?
I have these questions related to my question title:
Do we, other species and things have our own gravity?
How much Gs a human have?
Are we effecting Earth, nearby moons and planets with our gravity?
- 291
0
votes
3
answers
221
views
What is the definition of potential energy? [duplicate]
I have problems with this equation: $$U_G ~=~ G\frac{m_1m_2}{r}.$$
It's for potential energy of say something placed on Earth.
But it intrigues me. $r$ is the distance from the very center of the ...
- 1,361
-1
votes
1
answer
500
views
Motion of a ball in a tunnel along Earth's diameter [closed]
Suppose, a tunnel is made along the diameter of Earth and we drop a ball inside it. How will the ball behave? Please help me understand.
0
votes
1
answer
379
views
Drift of Earth's orbit?
How much has Earth drifted (inwards or outwards) from its orbit about the sun? Or has Earth has not moved at all, compared to, say, 1000 years ago? 10,000 years ago?
0
votes
1
answer
375
views
Why Earth is not a cuboid? [duplicate]
There must be some scientific reasons for why earth is a spheroid but what are they? If Earth would be a cuboid, Would it matter?
user66452
0
votes
5
answers
1k
views
Why is Earth's gravitational pull only at its center?
Why is Earth's gravitational pull only at its center?
Does acceleration due to gravity remain constant wherever I go in and on the Earth?
- 11
0
votes
0
answers
58
views
Why isn't $g$ larger on the equator? [duplicate]
I understand that at the equator, you will have maximum centripetal force acting on you, whereas if you're standing directly on the pole you will have none.
But because centripetal is a resultant ...
- 131
0
votes
3
answers
2k
views
Why does the value of gravity decrease as we dig into the Earth, but also decrease as we enter the upper atmosphere? [duplicate]
I know the answer (hence, the title). But, why, i do not understand?
- 266