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03:35 PM
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If the earth is spinning why do we need so many planes?
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[quote:Anonymous Coward 75238621:MV8zNTgwNDkwXzYzOTM5MDE5XzYxRTJEMzQ0] [quote:Anonymous Coward 75240183:MV8zNTgwNDkwXzYzOTM4OTgwXzdFOTE4QzQz] [quote:Anonymous Coward 75238621:MV8zNTgwNDkwXzYzOTM4OTU3XzU1NUI2N0FE] [quote:Anonymous Coward 75240183:MV8zNTgwNDkwXzYzOTM4OTEwX0FGNTMzNzBB] [quote:Anonymous Coward 75238621:MV8zNTgwNDkwXzYzOTM4ODcyXzE2QzU5Qjk3] When you jump up, you have a velocity which is the velocity you had while spinning along with the earth. Having a velocity while being pulled by a constant force results in a cyclic motion. In this case, earth's gravity is pulling on you. Also, your path on this cyclic motion with the velocity you had before the jump eventually puts you back onto earth. Another problem is that the atmosphere is both pushing you down and dragging you along towards the earth rotation. It's actually rather complex. But let's assume earth had no atmosphere. In such a case, you could have a catapult that would shoot you into the opposing direction of the earth's rotation just a few meters above earth with the perfect velocity such that you would stay always a few meters above the ground. Unless my thinking went wrong, you could then actually use this as a means of travelling as far as you want around earth, just by waiting long enough. Again, if my imagination does not fail me, one could imagine building a huge vacuum tube going all around earth, then accelerating things inside that tube in the opposite direction of earth's rotation just to the right velocity, such that the orbit is exactly within that vacuum ring/tube around earth. That would be quite a low energy transportation method. [/quote] If this was fact, they could easily have invented hovercars instead of what we use today. [/quote] No. Hovercars are supposed to defeat gravity. What i described is basically what satellites orbiting around earth do. They are orbiting around earth because they were given the right velocity depending on their height and are constantly pulled by earth's gravity, resulting in a cyclic motion that would continue forever (almost). Satellites do lose some energy slowly, especially low orbiting ones which are subject to a thin atmosphere still and require a little bit of boosting to stay in their orbit. But with no atmosphere at all, they would retain their orbit almost forever. [/quote] So we just need to find the right velocity to get my invention off the ground? [/quote] No. That is the easy part. The difficult part is building a vacuum tube all around earth. [/quote]
Original Message
We would just need an invention to lift us off the ground and pop us back down when the earth has rotated to where we need to be.
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