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Classical Physics
How long it takes the Earth to fall halfway to the Sun--ellipse method
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[QUOTE="Andrew Mason, post: 6542814, member: 15795"] Use Kepler's third law to find the period of an elliptical orbit where the semi-major axis is the half the radius of the Earth's current orbit. When stopped, the Earth is at the farthest point from the sun. Since the Earth would have no tangential speed, the orbit is the extreme elliptical orbit where the semi-minor axis is 0. In other words, and eccentricity of the ellipse is 1, putting the focii at the extrema of the ellipse. So the other extrema (also the other focus) is the centre of the sun (for practical purposes). AM [/QUOTE]
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How long it takes the Earth to fall halfway to the Sun--ellipse method
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