Kepler determined that planets change their speed as they travel around * the sun. This happens due to all of the following EXCEPT
A). The sun's gravity makes the planets slow as they get closer
B). The sun's gravity pulls against the planet's inertia in some places
C). The sun's gravity pulls with the planet's inertia in some places
D). The planets' orbits are elliptical
A). The sun's gravity makes the planets slow as they get closer
The correct answer is C). The sun's gravity pulls with the planet's inertia in some places.
To determine the correct answer to this question, we need to understand Kepler's laws of planetary motion. Kepler's first law states that the paths of the planets are elliptical, with the sun at one of the foci of the ellipse.
Now, let's analyze the given options:
A). The sun's gravity makes the planets slow as they get closer: This is a correct statement. According to Kepler's second law, the planets move slower when they are closer to the sun due to the gravitational attraction between them.
B). The sun's gravity pulls against the planet's inertia in some places: This is also a correct statement. Kepler's second law states that the sun's gravitational pull acts against the planet's inertia, causing it to change speed as it moves along its elliptical orbit.
C). The sun's gravity pulls with the planet's inertia in some places: This statement is incorrect. Kepler's second law states that the sun's gravity pulls against the planet's inertia in some places, not with it.
D). The planets' orbits are elliptical: This is a correct statement. Kepler's first law of planetary motion states that the orbits of the planets are elliptical.
Based on the explanations above, the correct answer is option C). The sun's gravity does not pull with the planet's inertia in some places.