All Questions
14
questions
20
votes
1
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2k
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If the tidal bulge on the earth speeds the moon up, how does the moon move to a higher orbit?
I understand that the moon causes a tidal bulge on Earth, and this tidal bulge moves slightly ahead of the moon due to Earth's rotation.
When reading about why the moon is moving away from the Earth, ...
- 303
1
vote
2
answers
136
views
Will the moon ever proceed to lose its orbit and hit the earth?
Assume that the moon it orbiting the earth in a circular trajectory.
It will experience an acceleration directed towards the centre of the earth given by $\frac{GM}{R^2}$ where $G$ is the universal ...
- 335
1
vote
0
answers
22
views
Centre of Gravity of Earth-Moon Elevator [closed]
Suppose you have a cylindrical elevator that resembles a rod of mass $m$, cross-sectional area $A$ and uniform density $\rho$, with a length $L$ spanning the distance between the Earth and the Moon. ...
- 119
0
votes
1
answer
60
views
If the Earth and the Moon were smaller, would moon tides be more or less intense?
If the Earth and Moon were smaller (and everything on them too, but keeping the same average density and the same "relative" distances, I mean... the same proportions!), would the tides ...
- 11
0
votes
1
answer
319
views
NASA's explanation on tidal acceleration
I've found an animation in NASA's website, illustrating tidal acceleration effect between the moon and earth.
It's the forth animation from the top in this page:
https://moon.nasa.gov/moon-in-motion/...
0
votes
1
answer
216
views
Would the moon eventually hit the Earth?
The moon is rotating around the earth in elliptic or approximately circular orbit with speed $v$. Its acceleration have two components tangential and radial one. It is the radial acceleration ...
user230437
-1
votes
3
answers
947
views
Confusion about angular momentum of earth-moon system
My assumed definition of angular momentum is the sum over $i$ of $L_i =r_i\times{\omega_i}\times{r_i}$ for each particle about some origin.
We have two spheres rotating about the centre of orbit. For ...
user86425
1
vote
1
answer
134
views
Why does not the Moon escape from the Earth? [duplicate]
We know that Gravitational Force that is applied by the sun on the moon is greater than that by the earth on the moon.
My Question is then why does not the moon escape from the earth and go towards ...
- 159
4
votes
1
answer
381
views
Expanding Moon's orbit and newtonian mechanics
the 2 body problem of earth and moon is suppose to be perfectly described by Newtonian mechanics / Kepler's laws.
How ever the moon's orbit is been moving away from earth in contradiction to the ...
- 1,447
1
vote
1
answer
670
views
Does Earth rotate around its geometrical axis OR the center of mass of Earth-Moon system?
I just came to know about barycentre. What exactly is this?
- 49
13
votes
6
answers
9k
views
Is the Moon in a "Freefall" Around the Earth? [duplicate]
The force of gravity keeps our Moon in orbit around Earth. Is it correct to say that the Moon is in “free fall” around Earth? Why or why not?
I think the answer is yes. The moon is falling towards ...
- 243
-3
votes
1
answer
2k
views
Why don't Moon collide with Earth but revolves due to gravity? [duplicate]
As we know gravitational force is a central force so due to gravitational effect they must collide with each other but why they revolve?
1
vote
1
answer
180
views
What is the outward force on the Moon that makes it go in orbit rather that falling straight to the Earth? [duplicate]
So, we know that the gravity is responsible for pulling the Moon towards the Earth. But because it moves in an orbit, it makes me think that there must be a force that is causing the moon to travel in ...
- 553
89
votes
9
answers
220k
views
Why doesn't the Moon fall onto the Earth?
Why doesn't the Moon fall onto the Earth? For that matter, why doesn't anything rotating a larger body ever fall onto the larger body?
- 1,033