. Elements of theoretical and descriptive astronomy, for the use of colleges and academies. 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 line, and F the given point, thedistances FM and GM are equal to eachother, for any point M of the 83. The fixed point is called the MECHANICS, 23. The resultant of two or more forces is a f
. Elements of theoretical and descriptive astronomy, for the use of colleges and academies. 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 line, and F the given point, thedistances FM and GM are equal to eachother, for any point M of the 83. The fixed point is called the 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 forces be represented in magnitude and directionby the two adjacent sides of a parallelogram, the diagonal willrepresent their resultant in magnitude and direction. Thus, in Fig. 84, if a force act at Ain the direction AD, and aC second force act at A in thedirection AB\ these two forcesbeing represented in magni-tude by the lengths of thelines AD and AB respectively,d the resultant of these two Fis-84 forces will be a force in the direction A G, and of a magnitude represented by the lengthof the line A G. The parallelogram is called the parallelogramof forces. 25. Conversely: any given force may be resolved into twocomponent forces, acting in given directions. Thus, in Fig. 84,let A C be th
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectastrono, bookyear1901
