University:
Hunter College CUNY
Course:
ASTRO 100 | Basic Concepts In Astronomy
Academic year:

2023
Views:

205

Pages:

2
Author:

stijlsectionize

Keeplers second law of Planetary motion - Keeplers second law tells us that a planet always sweeps out equal areas in equal times. Therefore, earth sweeps out the same area in any 31- day period, no matter what month. - Kepler’s second law tells us that a planet moves faster in its orbit when it is closer to the Sun (near perihelion) than when it is farther (near aphelion). This law applies to all planets and therefore explains the statement about Mars. - Although Kepler wrote his laws specifically to describe the orbits of the planets around the Sun, they apply more generally. Kepler's second law tells us that as an object moves around its orbit, it sweeps out equal areas in equal times. - the fact that that the comet sweeps out equal areas in equal times implies that its orbital speed is faster when it is nearer to the Sun and slower when it is farther away. - Since Kepler's second law tells us that the asteroid will sweep out equal areas in equal time intervals. Therefore, the area swept out in any one week period must always be the same, regardless of the asteroid's location in its orbit around the Sun. Keeplers third law of Planetary motion - Kepler’s third law can be stated mathematically as p^2 = a^3, where p is the planet’s orbital period in years and a is its average orbital distance in AU. - All of the following statements are true. Which one can be explained by Kepler’s third law? A: venus orbits the sun at a faster orbital speed than the earth - Note: the line that passes through the star and connects the nearest and farthest points of the planet's orbit is called the major axis, and half this line is the semimajor axis — which we consider the planet’s average distance from the star. - The time it takes a planet to complete an orbit is called its orbital period. - Planets with larger average orbital distances have longer orbital periods. - Planets with larger average orbital distances have slower average speeds. - Kepler’s third law tells us that the orbital period of the planet depends on its average distance from its star, but not on the planet’s mass. As Newton later showed with his version of Kepler's third law, this is actually an approximation that works well whenever the planet's mass is small compared to the mass of the star.

Pearson Notes 2 - Keeplers Second Law of Planetary Motion

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