Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 261
246 APPENDIX. The two fixed points are called the foci, and the middle pointof the line joining them is called the centre. 22. The parabola is a plane curve, everypoint of which is equally distant from afixed point, and from a right line given inthe plane. Thus, in Fig. 83, in which ABis the given… … MECHANICS, 23. The resultant of two or more forces is a force which singlywill produce the same mechanical effect as the forces themselvesjointly. The original forces are called components. In all statical in-vestigations the components may be replaced by their resultant,and vice versa. 24. If two…
Astronomy
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