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4 votes
1 answer
163 views

Would the Moon move away if the Earth were frozen with no liquid tide?

The moon is moving further from the Earth. To the extent that after 600 million years we will no longer enjoy full solar eclipses as it will be too far away to completely block the sun. The reason the ...
Francis Cagney's user avatar
0 votes
1 answer
78 views

What happened to Newton 3rd law if our Moon is moving away at 1.5" yearly? [closed]

Our Moon is going away and I read that it is the culprit is our ocean, but then what happens to Newton 3rd law there should be an equal and opposite forces too so where's that? Is it absorbed by the ...
user6760's user avatar
  • 13k
20 votes
1 answer
2k views

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, ...
WillowRook's user avatar
0 votes
0 answers
44 views

Does earth revolution speed slowing down because of small drag from space is not empty?

I read that universe is not empty, in least dense parts has 1000 atoms per cubic meter, does that slow down earth speed? Why these atoms are there, why they are not attracted by surrounding gravity ...
22flower's user avatar
  • 613
0 votes
1 answer
118 views

Can gravity of planets besides Sun and Moon affect tides on Earth?

The tides in some places on Earth are over 50 feet. If the gravity from Venus had a ten thousandth the affect of the Sun and Moon on a 50 foot tide it would make a difference of one twentieth of an ...
JohnTrainor's user avatar
1 vote
2 answers
131 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 ...
Orpheus's user avatar
  • 335
0 votes
1 answer
52 views

Why is the time difference of equal tide states not 50 minute if one lunar day is 24 hour and 50 minutes?

I do understand that tidal forces are caused by de difference of gravitational force between both opposite points of the earth where a bulge is formed. I do understand that a lunar day is ruffle 24 ...
Kagawa Kisho's user avatar
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 ...
jainemarie's user avatar
0 votes
1 answer
316 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/...
Shai Yefet's user avatar
0 votes
0 answers
41 views

Earth, Moon, gravitatioal pull

Does the gravitational pull that causes tides, also affect the Earth's land mass. Does it affect the atoms, molecules, is there a slight bulge to the actual Earth / Land itself?
Joe Saraceni's user avatar
2 votes
3 answers
503 views

Weight dependency on the location on Earth relative to Sun

In this post a theoretical physicist says that one will weigh less at the point on the Earth closest to the Sun due to the Sun's gravity, which makes sense to me. But he also says that one will weigh ...
sequence's user avatar
  • 568
2 votes
2 answers
255 views

What is the difference of gravity between lowest tides and highest tides?

I know tides are due to gravitional gradients so the difference of gravity between places does not need to be big in order to generate tides. Regardless, what difference are we talking about, ...
Winston's user avatar
  • 3,236
0 votes
2 answers
826 views

The role of the Sun in spring and neap tides

I am trying to understand how the Sun affects tides on the Earth's oceans and seas. It is quite clear that when the Moon is in the first and in the third quarter, the Sun's and the Moon's ...
DavideM's user avatar
  • 135
1 vote
1 answer
82 views

Earth's unimpeded rotation for billions of years [duplicate]

My nephew (7th grade) has stumped me with this question. If I spin a top, it eventually stops, because of friction, air resistance etc. How come the Earth has been spinning non-stop for 4.5 Billion ...
Sandeep's user avatar
  • 113
0 votes
2 answers
569 views

In the difference between the sun and moon's tidal effects on earth, is density or distance a larger factor?

This question is inspired by the (now looking at it, improper use of, my bad) comments section here in Physics SE. I'm not sure I could explain better than our short discussion does below: No, the ...
TCooper's user avatar
  • 161

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