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1. A planet orbits a star with a period of 275 days and semimajor axis of...

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Physics

1. A planet orbits a star with a period of 275 days andsemimajor axis of 3.4×10^11m. If this planet's eccentricity iszero, what is the mass of the star?

b. Another planet orbits this same star with a period of 453days. If it's eccentricity is e= 0.43 then how fast is this planetmoving at Perihelion? Aphelion?

c. What is the second planet’s Kinetic Energy at Aphelion if ithas a mass of 5×10^26 kg? What is it’s potential energy atAphelion?

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