By S.I. Hayek

Hayek (Pennsylvania nation college) provides equipment of utilized arithmetic which are relatively fitted to the applying of arithmetic to actual difficulties in technology and engineering. The textbook is meant for a three-semester graduate direction series.

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**Example text**

The height of the perigee is less by approximately 110 km. 17 Let a drop of tea fall into a glass of tea elose to the center. The waves colleet at the symmetrie point. The reason is that, by the foeal definition of an ellipse, waves radiating from one foeus of the ellipse eollect at the other. 18 By planets we mean here points in a eentral field. 40 8: Investigation of motion in a central field Figure 36 An orbit which is elose to circular Hint. The orbit differs from a cirde only to second order, and we can disregard this difference.

0' Figure 37 Moment of the vector F with respect to an axis Let z be the axis, oriented by the vector ez in three-dimensional euclidean space E3 ; F a vector in the euclidean linear space 1R 3 ; 0 a point on the z axis; r = x - 0 E 1R3 the radius vector ofthe point XE E3 relative to 0 (Figure 37). Definition. The moment M z relative to the z axis of the vector F applied at the point r is the projection onto the z axis of the moment of the vector F relative to some point on this axis: 20 The case M = 0 is left to the reader.

R= au M2 ßr + r7 - or r = - av ßr' where V = U M2 + 2r 2 • The quantity V(r) is called the effective potential energy. D Remark. The total energy in the derived one-dimensional problem El ,2 = 2" + V(r) is the same as the total energy in the original problem E = i2 2" + U(r), since B Integration 0/ the equation 0/ motion The total energy in the derived one-dimensional problem is conserved. Consequently, the dependence of r on t is defined by the quadrature , = J2(E - V(r» f f dt = dr J2(E - V(r»· Since eil = M/r 2, dep/dr = (M/r 2)/J2(E - V(r», and the equation of the orbit in polar coordinates is found by quadrature, ep = M/r2 dr f J2(E - V(r»· C Investigation 0/ the orbit We fix the value oft he angular momentum at M.