All Questions
Tagged with newtonian-gravity gravity
404
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611
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Increasing the speed of satellite to raise an orbit
Suppose we have a satellite orbiting the Earth in an elliptical-closed orbit. When the satellite reaches the perigee, its velocity is increased in the cross-radial direction. According to all the ...
- 1,791
1
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1
answer
136
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Conceptual Question: What would happen to satellites orbiting the earth if mass of earth suddenly increases? [closed]
Would the satellite crash onto the earth? If so, why, and in what kind of motion? A spiral motion sounds intuitive, but why?
Or there is another possibility: will the satellite continue to execute ...
- 45
2
votes
3
answers
458
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Can you explain this line from "A brief history of time"?
Newton realized that, according to his theory of gravity the stars should attract each other, so it seemed they could not remain essentially motionless. Would they not all fall together at some point? ...
- 39
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Does General Relativity provide a value for $G$? [duplicate]
It only recently was specifically pointed out to me that Einstein was right, and Newton was wrong.
Newton wasn't wholly wrong. He theorized that gravity was a force that acted between bodies, and came ...
- 480
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2
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71
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Why does the aglet of laces in my jacket hood swing like a pendulum when I walk?
I have observed that the aglet in the laces of my jacket hood swing like a pendulum when I walk. I cannot think of any forces which are the cause of its movement in this way.
So why is it like this.
- 452
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1
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92
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Why Moon is not falling on Sun (Hill's sphere)?
The Hill's radius of Earth in Earth-Moon system calculated by formula https://en.wikipedia.org/wiki/Hill_sphere is 58212 km
But the distance between Moon and Earth is 384,400 km
So, why Moon is not ...
- 768
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1
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66
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If we increase and decrease gravity periodically, what is the name of the resulting wave?
The gravitational waves, as in the case of merging black holes, expand like water ripples in spacetime (this is how they are depicted in general), and they affect everything in the vicinity, including ...
- 720
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Why does the national center for science education say “gravity is only a theory”? [closed]
I had someone show me that when you search “gravity is fact” on google you’ll get the National Center for Science Education saying things like “gravity is only a theory”
Can someone just read these ...
- 340
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2
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182
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Will a satellite escape from the bounds of Earth's gravity if its orbital velocity is increased to escape velocity?
If orbital velocity $(v=\omega r)$ is increased to escape velocity at that certain orbit, will it move to infinity? I know that it will skid from that orbit as vehicles do when their velocity is more ...
- 598
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1
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101
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Dark Matter/Energy & Space-Time [closed]
After searching for quite a while for a minimalist approach to explaining Dark Matter as well as Dark Energy, unfortunately without much good, I decided I may as well help fill the explored paths, or ...
- 11
2
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1
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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
15
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8
answers
2k
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What is the true nature of gravity? [closed]
In 17th century, Sir Isaac Newton gave us the universal law of gravitation which stated that gravity is an inverse square force. In 1915, Albert Einstein recognised gravity as a curvature of space-...
- 255
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2
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105
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Combining Newtonian Gravity and length contraction from SRT?
The value of $\gamma$ that I will use is
$$\gamma=\sqrt{1-\frac{v^2}{c^2}}$$
And length contraction is
$$L_0=\frac{L}{\gamma}$$
Where all variables have usual meaning.
Let the gravitational pull on ...
- 143
8
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3
answers
746
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Regarding distance laws of gravity from “A Brief History of Time” and why the Earth doesn't fall into the Sun
In “A Brief History of Time”, Hawking explains Newtonian gravity in Chapter 2, Space and Time. The further apart the bodies are, the smaller the force. The gravitational attraction of a star is ...
- 183
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1
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97
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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 ...
