A Treatise On Dynamics of a Particle, With Numerous Examples
A Treatise On Dynamics of a Particle, With Numerous Examples
Peter Guthrie Tait
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Digitized by VjOOQIC 128 CENTRAL ORBITS. 149i A particle is projected from a given point in a given direction ana with a given velocity , and moves under the action of a central attraction varying inversely as the square of 'the distance; to determine the orbit We have P=s fiu*, and therefore 351+.-J.-0, the integral of which is tt-^ = ^cos(5 + 5), or, as it is^ usually written, u=^^{l+ecos{0-a)} (1). This gives 5fl'*""l^^^"^ (^ — a) (2). Let It be the distance of the point of projection from t...he center; /8 the angle, and Fthe velocity, of projection ; then when ^ = 0, «"5' ^«*^=-SSL- Hence, by (1), —^ — 1 = 6 cos a, .and, by (2), ~».^^* )8 = - e sin a. From these^ tan a= —75 — f! •(3). h* ,« 2/* and **=';?^jJ,e>l, and the orbit is a hyperbola, F*=^, e = l, a parabola, F*
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