A need a physics genious to answer this questions?

1) compare Ptolemys model of the solar system with copernicus's. how does kepler's first law of planetary motion refine Copernicus's model?2) Does a planet in orbit around the sun travel at a constant speed?How do you know?3)suppose you know the mean distance between both mercury and the sun and venus and the sun. You also know the period of venus's orbit around the sun. how can you find the period of mercury's orbit?4)Explain how Kepler's laws of planetary motion relate to newton's law of universal gravitation?5) Find the orbital speed and period of earth's moon. the average distance between the centers of Earth and of the moon is 3.84x10^8m. (use formula)