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Thread: A simple question on Gravity, Earth and Airplanes

  1. #1 A simple question on Gravity, Earth and Airplanes 
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    Hello to everyone reading this post

    I have a very simple question about gravity. We have seen planes flying at altitudes of around 35,000 ft. So if a plane takes of from Hongkong it will land in spain more quickly. And it will take more time if it travels form spain to hongkong.
    This is bcoz of the rotation of the earth from east to west.

    SO My question is if i happen to lift myself up in space by about say 2ft, will the earth pass by and say within a few hours spain will arrive automatically due to the rotation of the earth form east to west . And then i can land on the earth.

    so why use planes in a east to west travel.....
    or is there anything else.


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  3. #2  
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    the reason why we don't do that is three reasons 1st EXTREMLY EXPENSIVE to go to high altitude using rocket engines second the atmosphere doesn't really ever end the gravity of earth still has a presence on you even when you are on the moon third it would be extremly hard to find a way of stoping a type of craft from moving foward in space with out it falling back to earth.


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  4. #3 Re: A simple question on Gravity, Earth and Airplanes 
    Forum Masters Degree Twit of wit's Avatar
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    Quote Originally Posted by adils3d

    I have a very simple question about gravity. We have seen planes flying at altitudes of around 35,000 ft. So if a plane takes of from Hongkong it will land in spain more quickly. And it will take more time if it travels form spain to hongkong.
    This is bcoz of the rotation of the earth from east to west.
    Nonsense.
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  5. #4  
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    Twit of Wit's response, while accurate, was not especially helpful. In simple terms the atmosphere the planes are flying in moves with the rotation of the planet. (There are complexities: google Coriolis force and Hadleigh cells if you wish.) Consequently, the scenario you described is simply wrong.

    In truth you can fly faster from Spain to Hong Kong because the planes will take advantage of the eastward blowing jet stream. This Saturday, volcano permitting, I shall take one hour less flying from Houston to Amsterdam than I did from Amsterdam to Houston. I recall on one Atlantic crossing, with a jet stream running at over 200 mph, our ground speed was supersonic.
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  6. #5 Re: A simple question on Gravity, Earth and Airplanes 
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    Quote Originally Posted by Twit of wit
    Quote Originally Posted by adils3d

    I have a very simple question about gravity. We have seen planes flying at altitudes of around 35,000 ft. So if a plane takes of from Hongkong it will land in spain more quickly. And it will take more time if it travels form spain to hongkong.
    This is bcoz of the rotation of the earth from east to west.
    Nonsense.
    First off, welcome to the forum. To put it simply, the Earth wouldn't 'spin out from under you'...man...that would bake the Olympic long jump CRAZY! Anyhow, it's roughly the same idea as dropping your pencil on an airplane in flight...it doesn't go shooting down the aisle at 450 mph. If I'm not mistaken, the theory of relativity applies to this, as in, you are still trapped too close to the warped space time of the Earth. A pencil dropped on a moving plane would fall to the floor because it is caught too close to the airplane's warped space time.

    Twit, when people ask a question, please keep in mind that none of us are as perfectly learned as you are. The OP asked a question to gain clarification on a subject matter...no sense in belittling and implicitly insulting the OP. Besides, you seem to have a lot of short, snarky responses...yet looking through dozens of your posts, I see very few posts that offer anything more than your kneejerk opinion, with no explaination...which leads one to believe you have only opinions, and lack the ability to explain them. See, like I explained above...and I could have errors in my explaination, but I am secure enough in myself to accept that I do not know everything, and sometimes get it wrong.
    "Let your anger be as a monkey in a pinata, hiding with the candy, hoping the children do not break through with a stick."

    "If you can't explain it simply, you don't understand it well enough." *Einstein
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  7. #6  
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    Well, you don't need the theory of relativity or warping of spacetime to explain it. Good old Galilean invariance will do. Galileo described it as follows.
    Shut yourself up with some friend in the main cabin below decks on some large ship, and have with you some flies, butterflies, and other small flying animals . . . hang up a bottle that empties drop by drop into a wide vessel beneath it... Have the ship proceed with any speed you like, so long as the motion is uniform and not fluctuating this way and that . . .The droplets will fall into the vessel beneath without dropping toward the stern, although while the drops are in the air the ship runs many spans . . . the butterflies and flies will continue their flights indifferently toward every side, nor will it ever happen that they are concentrated toward the stern, as if tired out from keeping up with the course of the ship.
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  8. #7  
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    Quote Originally Posted by Harold14370
    Well, you don't need the theory of relativity or warping of spacetime to explain it. Good old Galilean invariance will do. Galileo described it as follows.
    Shut yourself up with some friend in the main cabin below decks on some large ship, and have with you some flies, butterflies, and other small flying animals . . . hang up a bottle that empties drop by drop into a wide vessel beneath it... Have the ship proceed with any speed you like, so long as the motion is uniform and not fluctuating this way and that . . .The droplets will fall into the vessel beneath without dropping toward the stern, although while the drops are in the air the ship runs many spans . . . the butterflies and flies will continue their flights indifferently toward every side, nor will it ever happen that they are concentrated toward the stern, as if tired out from keeping up with the course of the ship.
    Damn...that would have been much simpler that relativity, lol...thanks...it's good to have a different perspective on the same phenomenon.
    "Let your anger be as a monkey in a pinata, hiding with the candy, hoping the children do not break through with a stick."

    "If you can't explain it simply, you don't understand it well enough." *Einstein
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  9. #8 Re: A simple question on Gravity, Earth and Airplanes 
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    Quote Originally Posted by LunchBox
    Quote Originally Posted by Twit of wit
    Quote Originally Posted by adils3d

    I have a very simple question about gravity. We have seen planes flying at altitudes of around 35,000 ft. So if a plane takes of from Hongkong it will land in spain more quickly. And it will take more time if it travels form spain to hongkong.
    This is bcoz of the rotation of the earth from east to west.
    Nonsense.
    First off, welcome to the forum. To put it simply, the Earth wouldn't 'spin out from under you'...man...that would bake the Olympic long jump CRAZY! Anyhow, it's roughly the same idea as dropping your pencil on an airplane in flight...it doesn't go shooting down the aisle at 450 mph. If I'm not mistaken, the theory of relativity applies to this, as in, you are still trapped too close to the warped space time of the Earth. A pencil dropped on a moving plane would fall to the floor because it is caught too close to the airplane's warped space time.

    A simple way to put it is that since you are in the airplane while it is gainning speed it is pushing you to be moving at the same speed of the airplane so anything you are carrying is being pushed too so when you drop the pencil inside the cabin it too is moving as the same speed as the airplane is (fowards) making it seem like it is falling striaght down.
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  10. #9  
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    There ya go! This is also a good illustration of time dilation...but the OP didn't ask for that...lol
    "Let your anger be as a monkey in a pinata, hiding with the candy, hoping the children do not break through with a stick."

    "If you can't explain it simply, you don't understand it well enough." *Einstein
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