All Questions
8
questions
2
votes
1
answer
97
views
Minimum mass of asteroid that could knock moon away [closed]
What is theoretically the minimum mass of asteroid, coming from deep space, that could knock the Moon away from Earth? The asteroid is not hitting the Moon, just interacting with it by gravity.
I was ...
0
votes
2
answers
490
views
Pressure (gravitational) applied by a hollow, uniform, spherical shell on an object inside it [duplicate]
1) It's a well-known result that the net force inside a hollow, uniform spherical shell is zero at all points.
However, for a spherical shell with finite mass inside of it, we say that the mass ...
- 85
1
vote
3
answers
537
views
Mean Gravitational 'Potential' Energy in Space
Imagine an arbitrary point in space. It is within the gravitational 'potential' of every mass (although billions of ly away) in the entire universe.
Since every mass adds a tiny fraction, what is ...
- 78
1
vote
1
answer
160
views
What imparts the linear motion or the tangential velocity to natural satellites like the moon to enable them to be in orbit around the earth?
From Newton's laws of motion & gravitation, it is clear that the force of gravitation provides the necessary centripetal force which acts along the line joining the centre of masses of the earth &...
- 21
2
votes
0
answers
152
views
Dark matter "hair" flowing through the earth
Gary Prézeau of NASA's JPL has done some calculations of how dark matter might be focussed by the Earth's gravitational field (publication preprint), and the results show some remarkable hairy ...
- 39
0
votes
1
answer
520
views
Consequences of inverse square law with vast distances (Gravity); (in addition, is light speed broken)? [duplicate]
As is well known, the gravitational force between two masses is dependent on the spatial distance between them. Therefore, even at vast distances, the masses exert equal and opposite forces on one ...
- 1,072
2
votes
2
answers
298
views
Universal gravity at small distance
Could it be that there is simply a maximum gravitational force that two bodies of finite mass can exert on one another? This would occur at $r=0$, so maybe there is some really really really small $a$ ...
- 31
2
votes
3
answers
3k
views
Initial vs Constant Orbital Velocity
I am working on some basic physics simulation for a game and need to simulate gravity. I have a system working that is behaving more or less correctly so far, but I want to see if I can send a ...
- 121