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A planet with mass 5.98 1024 kg orbits a star with mass 1.99 1030 kg. The distance between the planet and the star at the perihelion is 1.39 1011 m,...

A planet with mass 5.98 × 1024 kg orbits a star with mass 1.99 × 1030 kg. The distance between the planet and the star at the perihelion is 1.39 × 1011 m, and the distance at the aphelion is 1.804 × 1011 m. The planet’s orbital speed at the perihelion is 32849.8 m/s.
Determine its orbital speed at the aphelion. Answer in units of m/s.

Determine its kinetic energy at the perihelion.
Answer in units of J.

Determine its potential energy at the perihelion.
Answer in units of J.

Determine the kinetic and potential energy at the aphelion.
Answer in units of J.

This question was asked on Mar 31, 2010.

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