# Tag Info

### Is the speed of Earth's spinning constant over a given 24 hours?

The rotation of the Earth (~73 µrad/s) does speed up and slow down by a few picoradians per second during the day because of solar/lunar tidal forces acting on the asymmetric distribution of the Earth'...
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### If the tidal bulge on the earth speeds the moon up, how does the moon move to a higher orbit?

To understand this, let’s start with a simpler example of orbital mechanics. Suppose we have a rocket in a circular orbit that wishes to transfer to a higher circular orbit. This proceeds in the ...
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### Would a giant ball on earth roll towards the poles?

The brief answer is no. The Earth is that oblate shape due to gravity and centripetal forces reaching an equilibrium, where essentially the gravitational potential is the same everywhere (at sea level)...
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### Is the speed of Earth's spinning constant over a given 24 hours?

The answer is that it depends on how technical you want to get. At first approximation, no, the speed of the Earth's rotation is constant. Getting more technical, the speed of rotation of the Earth ...
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### Would a giant ball on earth roll towards the poles?

A big enough giant ball might actually roll towards the equator The other two answers nicely explained why water would not flow towards the poles. However, looking at the question as asked - I think a ...
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### Could Earth's Zircon (used in geological dating) have formed in extraterrestrial events before the Earth was formed?

It would seem strange to find that the oldest material found on Earth all formed in some extraterrestrial event that post-dates the ages of the oldest meteoritic material in the Solar System. The ...
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### What is the gravity in the center of Earth?

The Earth is roughly a sphere. If you excavated a hole in the centre and somehow transport yourself there, there would be no net gravitational force (due to the Earth) acting upon you, providing that ...
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### Why is aurora borealis circular in shape when viewed from space?

Only some of the aurora patterns are circular; most of them are more irregular and blobby in shape. It is known that the aurora itself is created when electrons in the earth's geomagnetic tail and ...
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### Would a giant ball on earth roll towards the poles?

There is something essential which was implicit in the other answers but not mentioned explicitly: The rotating Earth, behaving essentially like a glob of fluid at large scale, "automatically&...

### Does life erode Earth's mass over time?

Remember that nearly all of life's energy ultimately comes from the sun. Life uses energy that is received from the sun, "mixes" it with matter from the earth, and eventually that energy ...
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### Why is aurora borealis circular in shape when viewed from space?

Yes, the field is stronger at the north pole, but it also has very little surface area perpendicular to the sun. The majority of the north pole field lines perpendicular to the sun are looped around ...

### Could Earth's Zircon (used in geological dating) have formed in extraterrestrial events before the Earth was formed?

Zirconium is an element, thought to be the product of the S-process in asymptotic giant branch stars. Zircon is a mineral, zirconium silicate, used in geological dating. Crystals of zircon form at ...
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### Are there torques affecting Earth?

Earth Rotation Variations from Hours to Centuries (Dickey) has some analysis of these variations and states that they are mainly due to interactions with the atmosphere and with the earth's core. ...
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### Can gravity of planets besides Sun and Moon affect tides on Earth?

The strength of tidal forces scales as $\propto m/r^3$, so remote objects will have a far smaller effect than nearby ones (like the moon) unless they are very massive (like the sun). Venus is about ...
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### Has a heavier atmosphere and the relocation of oil around the Earth had a measurable effect on the rotation of the Earth?

The effect is minuscule, because: Oil and gas and coal do not come from "the center of the Earth", they come from relatively close to the surface. The deepest oil wells in existence are &...
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### Centrepetal force at the north or south pole

You have made a very common error. $v$ varies with $r$; $\omega$ does not. Therefore, as $r\to0$, $a=r\omega^2\to 0$ as well.
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### Why something connected to the ground has 0 potential?

I'm studying the concept of grounding of neutral wire in AC. I have done an extensive research on the internet to answer the question "Why the neutral wire has 0 potential ?". The answer is ...
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### Does life erode Earth's mass over time?

Good question! No, life does not reduce the mass of Earth. Life is cycling elements such as C, O, N and H. It is fuelled nearly completely by solar energy. This is converted to heat, which at the end ...
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### Conservation of water?

Is the total number of water molecules on Earth exactly constant ? No, because of the various chemical reactions that consume or produce water molecules. Is the total number of water molecules on ...
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### Conservation of water?

The new question you've asked is one of geology, which means the details are a bit fuzzy. It is known that water is lost over time from the atmosphere. It is believed that "... the Earth lost ...
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### Would a compass on its side point at the ground?

If a compass was turned on it's side, would the north pointing arrow point toward the ground along that straight line? No. A compass doesn't point at the north magnetic pole. It aligns itself with ...
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