All Questions
13
questions
4
votes
4
answers
343
views
What is the relationship between gravitation, centripetal and centrifugal force on the Earth?
I'm trying to analyze a situation wherein a ship is moving across the surface of the earth. I am trying to analyze this situation in a reference frame that is rotating with the earth (NED frame).
I am ...
- 311
14
votes
9
answers
7k
views
Is Earth really flattened at the poles because of centrifugal force?
My question is pretty much all in the title. I was always told that our planet is flattened at its poles due to the centrifugal force generated by its own rotation. However I don’t see how centrifugal ...
- 427
-1
votes
1
answer
78
views
How does a gas giant planet hold it's spherical shape when it has tidally locked rotation in it's orbit around the Sun?
How does a gas giant planet hold its spherical shape when it has a tidally locked rotation in its orbit around its Sun? Wouldn't it fall apart without its gravitational pull from the rotation? How ...
1
vote
3
answers
262
views
Does gravity cause the Earth's equatorial bulge?
The way I understand centrifugal force, I don't see how Earth's daily rotation alone would cause equatorial bulges to form. The usual explanation is that the centrifugal force increases with distance ...
- 31
9
votes
11
answers
5k
views
Can a person on the equator jump up higher into the air at sunset than at sunrise?
I am wondering if a person on the equator can jump up slightly higher into the air at sunset in comparison to jumping up into the air at sunrise.
The reason for this would be that at sunset the Earth ...
- 478
1
vote
3
answers
1k
views
Which force provides the centripetal acceleration that makes objects on earth's surface rotate about Earth's axis of rotation?
Let's say an object is at rest in Earth's reference frame. We know that Earth's reference frame is non inertial. If we were to observe that object from an inertial frame, we would see three forces ...
- 866
1
vote
2
answers
1k
views
Difficulty understanding why acceleration of free fall is lower at the equator than the poles
I have been told that the acceleration of free fall is lower at the equator than at the poles, and that this has to do with the fact that at the equator, you are moving with circular motion so ...
- 187
3
votes
1
answer
184
views
Is the apparent gravitational force on certain parts of a rotating spherical planet off centre?
For a person standing at the equator, if he sees an object in free fall, he will see that the object accelerates downward at the rate
$$a = g - \omega^2R$$
where $R$ is the radius of the planet and $\...
- 1,931
3
votes
2
answers
504
views
What is happening with the horizontal component of the Earth's centrifugal acceleration?
We know that the equator has the highest centrifugal acceleration caused by the rotation of the earth (a = 0.034m / s2) but it is negligible because the vector of the acceleration of gravity is much ...
0
votes
1
answer
402
views
Why do we weigh less on equator when centrifugal force isn't a force at all? [duplicate]
Why would we weigh less on equator as the weighing machine measures the force by which we push ground and that should not change if are on equator or poles?
user250074
0
votes
0
answers
75
views
Weight at Poles and Equator Wrong?
Recently, I was thinking about the acceleration due to gravity on Earth when I remembered that I was taught that you weigh less at the equator because a fictitious centrifugal force "throws" you off ...
- 101
0
votes
4
answers
7k
views
What is acceleration due to gravity at the centre of the earth? [duplicate]
When I asked my teacher that what is the acceleration at the centre of earth, he replied that it is 0 as when we move inside the earth, the effective mass decreases i.e. the mass that exerts ...
- 592
0
votes
0
answers
22
views
Are the high tides always more unequal when the centre of gravity is within a planet?
In case of our high tides at both sides of the Earth it seems that they are almost equal. But is there a slight difference because the center of gravity is about 1,700 km below the surface of the ...
- 3,348