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WK2HW - JO

# WK2HW - JO - H omework Assignment(due on Tuesday JO 1 Why...

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Homework Assignment (due on Tuesday) - JO 1) Why did Plato propose that all heavenly motion was uniform and circular? Because the most perfect geometrical form was the sphere and therefore the most perfect heavens must be made of up spheres rotating at constant rates and carrying objects around in circles. 2) Why did Copernicus need to include small epicycles in this model? Copernicus placed the sun at the center of the system. But, he continued to use perfect circles for the planets orbits. Since the orbits are not perfect circles (they are ellipses), planets would fall behind of his calculated values. So he had to re-introduce epicycles to account for the differences. 3) What are Kelper's 3 laws of motion? I. The orbits of the planets are ellipses with the sun at one focus. II. A line from a planet to the sun sweeps over equal areas in equal intervals of time. III. A planet’s orbital period squared is proportional to its average distance from the sun cubed: P 2 yr  = a 3 AU 4) If a planet has an average distance from the Sun of 4 AU, what is its orbital period? 4

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WK2HW - JO - H omework Assignment(due on Tuesday JO 1 Why...

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