Seems like there is a bit of confusion here. You are talking about two different things. Aircraft fly in a atmosphere, using pressure differentials to create lift which acts against gravity. The question of a body 'hovering' above earth and it moving beneath has you mixing some things up.
In a planetary gravitational field, there will always be some velocity that maintains its distance from the planet. That is the orbital velocity. It is very fast for near surface objects. Much faster than a plane can travel without experiencing catastrophic frictional effects. If there was no atmosphere, you could orbit at any height (well, above mountains).
Now, for objects in very high orbits, the path around the planet is much farther, so the total orbit periods decrease. Until you get to so called 'geosycronous' orbits. Go farther away, and the earth appears to turn underneath. People on the moon will be in earth orbit and see the earth turn.
Now, you could build a rocket that would ascend to a certain height then maintain that altitude and speed where you could watch the earth turn underneath you. But you would not be able to do it for long as it would require significant energy.
2006-07-20 10:06:40
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answer #1
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answered by Karman V 3
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Well, in principle it is always possible to travel without moving provided the plane hovers above the earth i.e. beyond the atmosphere and in the space. Suppose the plane hovers above the earth but still within the atmosphere, remember that there are very high pressure gases that are almost in constant pace with the rotation of the earth and the higher and higher you go, the relative pace can be noticed. The plane hovering above the earth surface but in the atmosphere has to face a huge wind fall in order to be at rest and to have a relative motion with respect to earth and so in general this will not happen for any light weight bodies suspended in the atmosphere just above the earth surface. One example is that a parachute which can stay in the atmosphere but can not see any relative motion with respect to the earth. The example for the fact that it is possible is a satellite in the space, of course intial conditions like velcity have to be considered.
2006-07-20 08:00:17
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answer #2
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answered by kumar_mc5 1
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First, in order to see the earth rotating beneath us, we need to rise above the atmosphere. If we want to travel that way by staying at the same place above earth and the earth moving beneath us, we have to stay at the same place in space.
That is practically not possible with a plane for two reasons.
First - a plane cannot get out of Earth's gravity and
Second - A plane flies by moving i.e. by gaining momentum, so it cant remain at one place.
However, We can travel without moving by going beyond atmosphere in a rocket, as it can escape the gravitational pull. then launch a space shuttle out of the rocket. Sit in that and position ourself above a particular place and wait. after a while, we find ourself above some other place.
we can travel without moving an inch, but its not economical as flight charges are much lesser than launching a rocket, managing flight and landing of a lander.
on the whole, interesting and thought provoking question. Hope you got the complete answer and in detail.
Would you consider it as the best then ? :-) Thank you. Bye
2006-07-20 07:18:32
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answer #3
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answered by rahulthesweet 3
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Well, sure!! If you could somehow manage to hover an aircraft without moving it, you would see the Earth turning beneath you. The Earth spins within it's atmospheric envelope. That same principle is why rockets are usually launched towards the east...to get that extra boost of momentum from the rotation of the Earth.
As far as travel goes...it would be an awfully slow method of traveling...and you could only go in one direction.
2006-07-20 07:11:20
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answer #4
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answered by Lisa S 2
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You would have to fly at around 1000 mph to the east for the earth to rotate beneath you. We have air here on earth that rotates pretty close to the same speed that the earth rotates. So "hovering" is not what you would have to do to accomplish that.
2006-07-20 07:24:39
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answer #5
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answered by Anonymous
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Even if we remove the atmosphere from the Earth we still have to contend with Gravity (until you are about 2/3 the way to the moon).
Even Geosynchronous Satellites have to maintain a proper "Orbital Speed" to maintain their position.
No, I'm afraid that Earths Gravity would "Drag" you along as you tried to hover. Unless your Hover included an angular momentum that made you move to either side.
2006-07-20 07:21:11
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answer #6
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answered by TommyTrouble 4
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Sorry, but it doesn't work that way. The atmosphere moves at the same speed as the rest of the planet. However, a hovering plane (or airship) can take advantage of the wind, which is kind of the same idea you were thinking of. It's just that you can't really control which way you go if you just drift with the wind.
2006-07-20 07:10:11
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answer #7
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answered by foofoo19472 3
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think of roughly this: whilst i grew to become right into a infant, driving in the vehicle with my mom, I had a ball that i might toss up in the air. I used to ask your self why the ball did not fly to the lower back of the vehicle and hit the rear window. it particularly is as a results of fact of inertia. Or to place it yet otherwise, why, once you leap up off the floor, does the Earth not fly one thousand mph under your ft suddenly? as a results of fact once you toss the ball up, or leap off the floor, those issues stay in action, there is not any new stress to cause them to quit. You leap up, you're moving a similar velocity as a results of fact the the Earth whilst your ft pass away the floor, you progression a similar velocity as whilst your ft have been on the floor once you're 2 ft. off the floor, you're moving a similar velocity once you ultimately land. in case you have been able to leaping one hundred ft, or one thousand ft severe, you will possibly nevertheless be moving on a similar 1000mph as a results of fact the Earth's floor is, and you will possibly land in a similar spot you left.
2016-11-02 10:13:20
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answer #8
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answered by ? 4
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Planes can't hover. They need momentum to keep them in the air.
2006-07-20 07:08:28
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answer #9
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answered by Anonymous
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I think it the earth would pull you around with it.I think this is how they can use the earth to help accelerate spacecraft.I'm not sure though!
2006-07-20 07:11:21
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answer #10
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answered by wolfmettle 3
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