Which one is the correct answer?
What is Kepler's First Law of planetary motion?
The orbits of the planets are ellipses with the Sun's center of mass at one focus.
The squares of the periods of the planets are proportional to the cubes of their semimajor axes.
The weight is equal to the mass times the acceleration of an object.
A line joining a planet/comet and the Sun sweeps out equal areas in equal intervals of time.
The force on a planet is proportional to its mass.
2007-03-02 02:00:50 · 5 answers · asked by tiffsag02 2 in Science & Mathematics ➔ Astronomy & Space
The orbits of the planets are ellipses with the Sun's center of mass at one focus is the right answer.
The first law says: "The orbit of every planet is an ellipse with the sun at one of the foci".
P^2 proportional to a^3
P = orbital period of planet
a = semimajor axis of orbit
So the expression P^2a^(–3) has the same value for all planets in the solar system as it has for Earth where P= 1 sidereal year and a=1 astronomical unit, so in these units P2a–3 has the value 1 for all planets.
The second law: "A line joining a planet and the sun sweeps out equal areas during equal intervals of time".
This is also known as the law of equal areas.
The third law : "The squares of the orbital periods of planets are directly proportional to the cubes of the semi-major axis of the orbits".
You must visit:
www.cvc.org/science/kepler.htm
2007-03-02 02:33:26 · answer #1 · answered by Anonymous · 3⤊ 0⤋
The first law says: "The orbit of every planet is an ellipse with the sun at one of the foci".
2007-03-02 02:05:05 · answer #2 · answered by NJGuy 5 · 2⤊ 0⤋
The orbit of a planet is an ellipse, with the Sun at one focus
2007-03-02 02:04:37 · answer #3 · answered by Mary B 2 · 2⤊ 1⤋
He mentions the massive bang and evolution jointly. contained in the eyes of a few creationists, those flow jointly because they both declare that God's creation adjustments over the years. it truly is suitable, each and each of the cosmologists are disciples of Darwin?! He costs Rob Roselli because the source of his ideas about Newton's guidelines of action, and Kepler's guidelines of Planetary action. i stumbled on Roseli's internet web site (second link below) - yet were given severe psychological indigestion, so i did not examine a lot of it!
2016-12-05 03:38:59 · answer #4 · answered by cheathem 4 · 0⤊ 0⤋
The first rule of planetary motion is you do not talk about planetary motion.
2007-03-02 02:04:09 · answer #5 · answered by Anonymous · 0⤊ 4⤋