Find the maxima and minima of the magnitude

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SUMMARY

The discussion focuses on calculating the maxima and minima of the magnitude of acceleration for a planet P in an elliptical orbit around a star S, given its period T and distances d (minimum) and 1.7d (maximum). The relevant equation derived from Kepler's laws is a = (2π)² * (r³ / T²) * (1/X²). Participants suggest substituting d for r to find the acceleration values at both distances.

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Homework Statement



A hypothetical star S has a planet P that moves in an elliptical orbit with period T . The minimum distance of P from S is d and the maximum distance is 1.7d.
(i) find the maxima and minima of the magnitude of the acceleration of P, in terms of d and T .

Homework Equations



dont know

The Attempt at a Solution



can anyone give me the equation for this
 
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Try Newton´s law of gravitation or Kepler´s laws.
 
a= (2*pi)^2 * ( r^3 / T^2) * 1/ X^2

minimum distance is d
max distance is 1.7 d

do i substitue d for r?
 

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