. The Boston school compendium of natural and experimental philosophy .. . f these two forcesalone prevailed, the ball would pro-ceed in the dotted line to B (accordingto the principle stated in number 126.)But as the resistance of the air ope-rates in direct opposition to the forceof projection instead of reaching theground at B, it will fall somewhereE C about E. It is calculated that the resistance of the air to a cannon ball oftwo pounds weight, with the velocity of two thousand feet in a sec-ond, is more than equivalent to sixty times the weight of the ball. 140. When a body is thrown upw
. The Boston school compendium of natural and experimental philosophy .. . f these two forcesalone prevailed, the ball would pro-ceed in the dotted line to B (accordingto the principle stated in number 126.)But as the resistance of the air ope-rates in direct opposition to the forceof projection instead of reaching theground at B, it will fall somewhereE C about E. It is calculated that the resistance of the air to a cannon ball oftwo pounds weight, with the velocity of two thousand feet in a sec-ond, is more than equivalent to sixty times the weight of the ball. 140. When a body is thrown upward obliquely, its What follows from this ? 138. What is a projectile ? 139. What line do pro-jectiles form in their descent ? Why is the direction of their motion graduallychanged from a horizontal to a perpendicular direction ? Illustrate this hy How g;eat is the resistance of the air calculated to be to a canon ball of twopounds weight, with the velocity of 2000 feet in a second ? 140. In what directtion will a body move, when it is thrown upwards obliquely ?.
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Keywords: ., bookcentury1800, bookdecade1830, booksubjectphysics, bookyear1837
