Question

1. which presents a system with elliptical orbit? a. copernican b. keplerian c. ptolemaic d. tychonic
2. which presents a heliocentric model of the universe?
3. which presents a geo - heliocentric model of the solar system?
4. which attributes retrograde motion of the planets to epicycles?
5. which states that a planet moves fastest when it is nearest to the sun?

Explanation:

1. Copernican model first proposed a heliocentric system with circular orbits, but Keplerian model refined it with elliptical orbits. So the answer for 11 is Keplerian.
2. Copernicus presented the heliocentric model of the universe.
3. Ptolemaic model presented a geo - heliocentric model of the solar system with epicycles to explain retrograde motion.
4. Ptolemaic model attributes retrograde motion of the planets to epicycles.
5. Kepler's laws state that a planet moves fastest when it is nearest to the sun.

Answer:

1. B. Keplerian
2. A. Copernican
3. C. Ptolemaic
4. C. Ptolemaic
5. B. Keplerian