. Practical physics. locity which the body loses per V second, that is, < = -; and the height reached Oti 0Ml () > () > () Fig. 79. A freely fall-ing body 78 FORCE AND MOTION must be this multiplied by the average velocity ; that is, ^ = -^^ or (• = V2 qS. ^9 (7). Path of a projectile Since (7) is the same as (6), we learn that in a vacuum the speed withwhich a body must be projected upward to Iise to a given height is thesame as the speed which it acquires in falling from thesame height. 96. Path of a projectile. Imagine a i^rojectileto
. Practical physics. locity which the body loses per V second, that is, < = -; and the height reached Oti 0Ml () > () > () Fig. 79. A freely fall-ing body 78 FORCE AND MOTION must be this multiplied by the average velocity ; that is, ^ = -^^ or (• = V2 qS. ^9 (7). Path of a projectile Since (7) is the same as (6), we learn that in a vacuum the speed withwhich a body must be projected upward to Iise to a given height is thesame as the speed which it acquires in falling from thesame height. 96. Path of a projectile. Imagine a i^rojectileto be shot along the line ah (Fig. 80). If itwere not for gravity and the resistance ofthe air, the projectile would travelwith uniform velocity along theline ah, arriving at the points1, 2, 3, etc. at the endof the successive of gravity, how-ever, the projectile wouldbe vertically below these Fi^points by the distances ft., ft., ft., etc. Hence it would follow the path indi-cated by the dotted curve (a parabola). But because of air resistancethe height of flight and range are diminished, and the general shape ofthe trajectory is similar to the continuous curved line. 97. The airplane. The principles underlying stability, aswell as those having to do with the resolution of forces
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
