Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
of 45° with the 56 MATTER, FORCE, MOTION, AND MECHANICS. horizon ; in Avhich case the greatest height attained is one-fourth ofthe range. For any range equally above or below 45°, the horizontal range willbe equally diminished; that is, the horizontal range will be the samefor 40° and 50°, and the… … (say fifty miles high), from which to project a cannon-ball. A ballshot from a cannon at tliis elevation, not being resisted by the air^might be driven eighty miles or more ; and, with suflficient projectileforce, a ball might be driven completely around the earth to the pointof starting, as shown…
Physics · Astronomy
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