An Elementary Treatise On Mechanics for the Use of the Junior Classes At the U
An Elementary Treatise On Mechanics for the Use of the Junior Classes At the U
S Stephen Parkinson
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2a-i= -, or a=j + -, tn o^Aer words, when the direction of projection bisects the angle between the plane and the vertical. REFERRED TO CO-ORDINATE AXES. 231 88. To find the equation to the path of a projectile referred to horizontal and vertical co-ordinate axes. Let A be the point of pro- ^ jection, Ay vertical, and Ax horizontal in the plane in which the projectile moves. AN=x, NP=y, the hori- zontal and vertical co-ordinates / of the particle at time t after projection, v the velocity and a... the elevation of projection. Let NP be produced to meet in T the line A T which represents the direction of projection. Then the horizontal velocity = v cos cc, which remains uniform, and the initial vertical velocity = v- sin a. And we have x = AN=vco$ a . T (i). And NP represents the space passed over parallel to Ay in time t by a particle projected with a velocity v sin a, and retarded by a force g hence by Art. (70) y = NP = v sin a . T \gtf (ii). Eliminating t between (i), (ii), we get gx* y ~ 2fl*cos 2 a'~ ** ' '* which is the equation to the path required, and represents a parabola.
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