What if you were in a hollow, extremely strong tube in the middle of a planet?

In summary, the feeling of apparent weightlessness or being in free fall depends on your distance from the center of the earth. If you are at the center, you would feel no net force. If you are not at the center, the net force depends on your distance from the center and follows the laws of gravity. The closer you are to the center, the stronger the gravitational force you would feel.
  • #1
kashiark
210
0
Would you be in apparent weightlessness?
 
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  • #2
Free fall?
 
  • #3
kashiark said:
Would you be in apparent weightlessness?
Yes, g for you would be zero.
 
  • #4
What, exactly, do you mean by "in the middle of thje planet"? If you mean a hollow tube, just large enough to contain you, and assuming that the planet is spherical and uniform, and that you are exactly at the center of the earth, you would feel no net force. For a tiny "bit" on mass on one side of you, there is an equal tiny bit of mass diametrically opposite and at thesame distance from you that will cancel its force.

If you are in the tube, but not at the center of the earth, what net force you would feel depends on your distance from the center of the earth. All mass at distance from the center of the Earth greater than your distance has a "cancelling" mass diametrically opposite and will contribute no new force. The mass still closer to the Earth than you are will still pull on you as if it were concentrated at the center of the earth. Gravitational force is proportional to the mass beneath you and inversely proportional to the square of the distance to the center of the earth. Since the mass beneath you is itself proportional to the cube of the distance to the center of the earth, the gravitational force you feel inside the Earth is proportional to the distance to the center of the earth.
 
  • #5
I thought as much; thanks!
 

Related to What if you were in a hollow, extremely strong tube in the middle of a planet?

1. What would happen if you were in a hollow, extremely strong tube in the middle of a planet?

Being in a hollow, extremely strong tube in the middle of a planet would be a very dangerous and uncomfortable situation. The extreme pressure from the weight of the planet's layers above would crush the tube and anyone inside.

2. How strong would the tube need to be to withstand the pressure in the middle of a planet?

The strength of the tube would need to be incredibly strong to withstand the pressure in the middle of a planet. It would need to be made of a material that is able to withstand millions of atmospheres of pressure, such as diamond or graphene.

3. Would it be possible to survive in a hollow tube in the middle of a planet?

No, it would not be possible to survive in a hollow tube in the middle of a planet. The extreme pressure and lack of oxygen would make it impossible for any living organism to survive in such conditions.

4. How would gravity be affected inside the tube in the middle of a planet?

The gravity inside the tube would be the same as the gravity on the surface of the planet. This is because the mass of the planet surrounding the tube would still exert the same gravitational force.

5. Could there be any potential benefits of being in a hollow tube in the middle of a planet?

While it is not feasible or safe for humans to be in a hollow tube in the middle of a planet, there could potentially be some benefits for scientific research. The extreme conditions could provide insight into the properties and behavior of materials under high pressure and high temperature.

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