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MIT 8.01 Physics I Classical Mechanics, Fall 1999 8 Online
OpenStudy (anonymous):

For an ellipse, where k is the sum of distance from any P(x,y) to its focal points, for what values of k will the locus be an ellipse, a line segment(what is the equation of the line), or the nullset?

OpenStudy (anonymous):

What about for hyperbolas, k=difference of distance between P and F F'. What values of k will the locus be a hyperbola,pair of rays(equation of each ray), null set? Can you have negative distance?

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