All Questions
19
questions
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If most of an atom's mass comes from binding energy, why did people think that anti-hydrogen could fall up if antimatter had negative mass?
Antimatter isn't bound by anti-energy, so doesn't that mean that even if elementary antimatter particles had negative mass, the total mass of an anti-atom would still be overwhelmingly positive?
9
votes
3
answers
2k
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Contradiction in negative mass interactions according to GR
I quote Sabine Hossenfelder:
Gravitation is a spin-2 interaction. It is straightforward to see that this means that like charges attract and unlike charges repel. The charge of gravity is the mass. ...
- 476
1
vote
2
answers
189
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What is the gravitational field intensity of a uniformly distributed mass content in Newtonian gravity?
In an infinite universe composed of single point masses which can be simplified as a uniformly distributed mass density, what is the equation for the gravitational field intensity in Newtonian gravity?...
- 476
0
votes
2
answers
119
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Since when did inertial mass and gravitional mass became equal?
If we think about inertial mass and gravitational mass as independent concepts and develop physics then we would know after a while they are only propotional (by precision we have by now). but it seem ...
- 1,409
0
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0
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29
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Will antimatter fall upward in a gravitational force field? [duplicate]
A positively charged particle has a force acting along the electric force field. The contrary is true for a negatively charged particle.
Can we apply the same analogy for antimatter and say that ...
2
votes
1
answer
125
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"Gravitational Charge" in Newtonian Gravity in Analogy to the Electric Field
I am currently reading Carroll's GR book p. 48. There he says that
If you like, $m_g/m_i$ can be thought of as the "gravitational charge" of the body
with the gravitational mass $m_g$ and ...
- 223
23
votes
4
answers
3k
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Is it possible that antimatter has positive inertial mass but negative gravitational mass? [duplicate]
Newtonian mechanics seems to allow for both positive and negative gravitational mass as long as the inertial mass is always positive. The situation is analogous to electrostatics but with the ...
- 2,403
0
votes
3
answers
249
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Does the gravitational field possess an inertial mass? [duplicate]
I understand that inertial mass, at least in part, comes from the inertia of energy in the zero momentum frame or rest frame of some physical system. So for a static charge the corresponding field ...
- 5,318
-1
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1
answer
84
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Why Mass is considered as a property in gravity theories rather than a unit? [closed]
Einstein's GR or Newton's equation uses mass as a property that causes gravity (physical phenomena)? For any physical phenomena to occur, there must be physical/chemical/biological/etc. action ...
2
votes
0
answers
847
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Geometric Explanation for the Equality of Active and Passive Gravitational Masses
In Newtonian gravity, as such, there are three masses: the active gravitational mass (the mass that generates the gravitational field), the passive gravitational mass (the mass that responds to the ...
user87745
1
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0
answers
82
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If there were positive and negative masses similar to positive and negative charges, would there be some kind of gravitational magnetic force?
Coulomb's law is very similar to Newon's law of gravitation. But as we go deeper into electromagnetic phenomena we see that it is very complex compared to newtonian gravitation. For example if the ...
- 529
10
votes
3
answers
8k
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Are electrons affected by gravity? [duplicate]
Again, probably a very naive question but just wanted to make sure. Are electrons affected by gravity? I was hoping someone could point me in the direction of some experiments that prove this.
- 1,552
18
votes
3
answers
5k
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Gravitational force when standing on an infinite disc
If a person were to stand on a flat disc of thickness 1 meter but infinite diameter, would they experience finite or infinite downward force?
There is an infinite amount of mass, all of which ...
user55611
1
vote
2
answers
180
views
Does the gravitational force of one object interfere with that of another?
Assume we have two iron spheres, Sphere A and Sphere B, with identical masses floating in the vacuum of interstellar space separated by some distance from each other. The gravitational force of each ...
3
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1
answer
196
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Wouldn't dark matter throw off the calculation of Earth's 'light' mass and estimates of its composition?
The Cavendish experiment first determined the mass of the Earth and (arguably) the gravitational constant. However, given the ubiquitous nature of dark matter, it seems reasonable that at least some ...
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