All Questions
90
questions
2
votes
2
answers
354
views
What happens to the water on the surface of the Earth if the Earth is not rotating about its axis in the Earth-Moon system?
Suppose the Earth is not rotating. As usual, the Moon follows its normal path around the Earth. Let's assume it's a circular motion and that there are no other gravitational influences.
A test ...
-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
41
votes
7
answers
9k
views
Why does the full Moon appear?
I know that the full Moon appears when Sun, Moon and Earth are in a straight line, but if we consider that they are in straight line, why is the Moon illuminated?
I mean to say that Earth should ...
- 592
2
votes
2
answers
473
views
If gravity can be disrupted by larger forces, why does the moon orbit the Earth instead of the Sun? [duplicate]
I read an thread on this site about how a larger gravitational pull can overpower a smaller gravitational pull. I took this to mind, and I started wondering why the moon orbits the Earth instead of ...
- 285
1
vote
4
answers
734
views
Does escape velocity require you to cross Moon's orbit?
Escape velocity is the velocity required to project an object from an object's (here, the Earth's) surface so that it "escapes" the gravity of that object (or in our case, the Earth's gravity). Now, ...
- 115
19
votes
3
answers
5k
views
How can a full moon be seen south of an observer's location?
I know this seems like a simple question, but I'm trying to debate with a flat earth theorist. I asked him to explain why can the ISS visibly be seen orbiting the Earth with the naked eye, and he put ...
- 215
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
1
vote
0
answers
25
views
What are ShadowBands during SolarEclipse and how can it be reproduced?
I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
- 11
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
37
votes
6
answers
12k
views
If the moon had a mirror surface, would the earth be equally illuminated as by the sun during full moon, or would it require a different mirror shape?
Suppose the apparent diameters of the sun and the moon are exactly the same (which in fact very close to the real situation). If the moon had a perfect mirror surface, would the reflected visible ...
-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?
0
votes
1
answer
5k
views
Moon vs Sun size and distance 400 times
I have seen below statement, and it doesn't sound right:
The Sun and Moon seem to have the same size because of this amazing coincidence:
the moon is 400 times smaller than the Sun and 400 closer ...
- 135
1
vote
2
answers
360
views
What changes about a helium-filled balloon on the surface of the moon?
In terms of air pressure, I think that the pressure inside the balloon should be equal to the air pressure outside so that it does not burst. So how will a helium-filled balloon behave on the moon in ...
- 201