The speed of an object on the equator of the earth

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robinson
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The speed of an object on the equator of the earth

Post by robinson »

This is an old one. It never goes well, because it makes you have to think, and that is fucking anethama, especially if you already dislike the person posing the conundrum.

It relates to the relativity shit that has raised its ugly head elsewhere, but hey, if you are always here posting and reading this shit, you already know that.

Quick summary: An object on the equator is said to be "moving" at around 1037 mph because the earth rotates once a day and the circumference is about 24,901 miles, and yes the reason the math works out so well is because the 24 hours is based on the complete revolution of the planet, herp derp, but let's make it simple and say 1000 mph

Here's a source so you don't try and impeach what I just wrote
Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour.
https://www.scientificamerican.com/arti ... per%20hour

No, that is not true, in fact it is

Complete rubbish

In other words, it is garbage, worthless, and it s complete in it's worthlessness

I realized this quite simply by trying to place a camera in a location to show this. I use astronomy software, which is really fucking cool as shit, and to make a movie (animation really) of anything, you simply have to pick a location for the camera. You can't avoid this, the software has to know where your virtual location is in order to render anything.

And before the pedant shows up, Speed is the rate of motion, or equivalently the rate of change of distance.

Speed is a scalar quantity with dimensions length/time; the equivalent vector quantity to speed is velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.

To say you are "moving east at 1000 mph" is a velocity measurement, but to have such a measurement, you have to choose a reference point. There is no point that you can choose to get a velocity of 1000 mph eastward, this is due to the laws of physics, as well as the acceleration of a spinning point.

The only possible point to choose would be a rocket or airplane flying 1000 mph west from your location, from which one could say you are moving eastward at that velocity, except it is a curving motion, so the velocity changes rapidly. (acceleration)

Which is why the speed of an object on the equator wouldn't be 1000 mph, but a rapidly changing velocity, until the rocket or airplane reached the opposite side if the earth, at which point it would reverse.

There is quite literally no other place to put a camera, especially to measure a 1000 mph speed.

So no, an object on the equator is not moving at 1000 mph. In fact, it isn't moving at all. Unless your point you measure it from is moving, but even then, you never get a 1000 mph measurement of speed. It's not physically possible.

More to come ...
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Re: The speed of an object on the equator of the earth

Post by Anaxagoras »

And your point is?

The earth spins relative to the rest of the universe.

We also know this indirectly due to the Coriolis effect.
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Re: The speed of an object on the equator of the earth

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Re: The speed of an object on the equator of the earth

Post by robinson »

My point, which is sharp and unmistakable, is that the speed of an object on the equator is not 1000 mph, much less "to the east", both of which are official claims/explaining from the experts and smarty pants scientists.

It's just like with the tides, or the heating of re-entry from orbit, where experts and official sources have all these explainings and reasons, which are complete rubbish.

Trying to wrench their minds right is like talking to a brick wall.
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Re: The speed of an object on the equator of the earth

Post by robinson »

Now of course an ivory tower super intellectual at-the-top-of-the-food-chain scientist is one thing, but even ordinary skeptics and physics oriented peoples have a real problem with understanding relatively simple things, and why the consensus is wrong. And of course global warming, the real and most important danger facing all mankind.
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Re: The speed of an object on the equator of the earth

Post by sparks »

What a fucking idiot.
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Re: The speed of an object on the equator of the earth

Post by robinson »

Since motion is relative, we measure speed and velocity from a reference point. Usually we use the solid ground we are on as the point. But with radar and lasers and cameras we can also measure speed from a moving object, and I am thinking of Trooper Mathews who has a very effective camera/radar system in his Highway Patrol vehicle. Damn you Trooper Mathews, damn you to hell!

But be it speed, or velocity, a point on the equator is never moving at 1000 mph, there is not even a reference point possible to get that figure.

Obviously there is movement, and rotation, only a complete moron would think this is an argument against that.

To realize the practical implications, the original question was about ""if I am at latitude 40 degrees north what would be my speed?" (the answer is to multiply the cosine of the degree latitude times the speed of 1,037.5646.) ... so 40 degrees: 794.80665 mph

But is the earth really moving at that speed? NASA and all the smart people say it is.
https://image.gsfc.nasa.gov/poetry/ask/a10840.html

Now speed is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction.

And velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.

OK but displacement from where? What is the point you can measure this amazing speed/velocity of the earth?

There isn't one. Saying there is would be complete rubbish.

If you think there is, what is it?
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Re: The speed of an object on the equator of the earth

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You get no points for being an insulting pussbag, or refusing to answer because the question is too dumb for words.
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Re: The speed of an object on the equator of the earth

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We ain't gettin' noplace fast!
Why you numbskull! Pick out two!
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Re: The speed of an object on the equator of the earth

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Evasion noted
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Re: The speed of an object on the equator of the earth

Post by robinson »

I'm quite willing to change my POV on this. Just tell me where to put the camera, that shows a 1000 mph speed, or velocity.
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Re: The speed of an object on the equator of the earth

Post by Anaxagoras »

robinson wrote: Tue Oct 13, 2020 11:56 pm I'm quite willing to change my POV on this. Just tell me where to put the camera, that shows a 1000 mph speed, or velocity.
How about the north pole or the south pole?
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Re: The speed of an object on the equator of the earth

Post by robinson »

Shows no movement at all.
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Re: The speed of an object on the equator of the earth

Post by Hotarubi »

robinson wrote: Wed Oct 14, 2020 12:06 am Shows no movement at all.
Wrong.

Polar motion.

You lose.
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Re: The speed of an object on the equator of the earth

Post by Anaxagoras »

robinson wrote: Wed Oct 14, 2020 12:06 am Shows no movement at all.
An experiment:

If you stand up straight, and stretch both arms out straight and horizontal, and spin around, are the tips of your fingers moving at a different velocity than your head?
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Re: The speed of an object on the equator of the earth

Post by Abdul Alhazred »

Inertial frame of reference.

That is all. :p
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Re: The speed of an object on the equator of the earth

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Here's the software that allows you (or anyone else) to simply make an animation illustrating the problem.

https://celestia.space/download.html
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Re: The speed of an object on the equator of the earth

Post by Anaxagoras »

Are you suggesting that the earth doesn't spin on its axis?
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Re: The speed of an object on the equator of the earth

Post by robinson »

Using the example of your own body, what direction is your hand moving? Let’s say it is moving at 5 miles an hour, based on the time and distance, could you say it is moving at 5 mph to the East? West?

Remember that is the claim about an object on the equator, that it is moving East at 1000 mph

Which is simply not true
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Re: The speed of an object on the equator of the earth

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The problem with the hand also explains why from your point of view, it’s not moving at all

The distance from you eye to the hand stays exactly the same

Yet obviously there is movement
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