Originally posted by klaus54
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Now, for the first few moments, what would the path of the pretty thing look like to an observer outside of the car and stationary with respect to the car?
BTW, this is NOT a good example of satellite orbit at all, since the fly-car gravity is negligible compared with the centripetal force. In a satellite-Earth situation, gravity force is not negligible. In fact if gravity force ceased, then satellite would go flying off on a straight-line tangential path, similar to what the butterfly's path inside a centripetally accelerating car would appear to an external observer.
This example can extend to a butterfly in front of the car. Both the butterfly and the car initially have the same circular orbit. Then the car begins to accelerate. The butterfly must also accelerate to keep pace with the car, or end up crashing into the car. Alternatively the earth decelerates and the butterfly moves away from the car. Analogous to the butterfly in front of the car, we can have a satellite orbiting in front of the earth's orbit around the sun at v. Then the earth begins to accelerate. The satellite must also accelerate to keep pace with the earth, or end up crashing into the earth. Alternatively the earth decelerates and the satellite moves away from the earth.
In both examples there is no force within the NM system to cause the butterfly/satellite to move with car/earth. If it is objected that the force within the NM system is gravity, then what negative outcomes follow?
1. The satellite in front of the earth's orbit is said to be caused to move faster around the sun, by the earth's gravity, which is a pulling force. But a pulling force will only make the satellite in front of the earth's orbit move slower around the sun, when the earth accelerates, thereby causing the satellite to fall into the earth.
2. The satellite behind the earth's orbit is said to be caused to move slower around the sun, by the earth's gravity, which is a pulling force. But a pulling force will only make the satellite behind the earth's orbit move faster around the sun, when the earth accelerates, thereby causing the satellite to fall into the earth.
I don't see how this problem is resolvable within the Helio-NM paradigm.
JM
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