Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
What is an ellipse?
|
A type of oval that happens to be the shape of bound orbits. An Ellipse can be drawn by moving a pencil along a string whose ends are tied to two tacks.
|
|
|
what is a focus or foci?
|
One of two special points within an ellipse that lie along the major axis; these are two points around which we could stretch a pencil and string to draw an ellipse.
|
|
|
What is major axis?
|
the longest diameter of an ellipse.
|
|
|
What is the semimajor axis?
|
half of the longest diameter of an ellipse.
|
|
|
What is the minor axis?
|
the shortest diameter of an ellipse.
|
|
|
What is eccentricity?
|
a quantity that describes how much of an ellipse is stretched out compared to a perfect circle.
|
|
|
What are Kepler's laws of planetary motion?
|
the three laws discovered by kepler that describe the motion of the planets around the Sun.
|
|
|
What is kepler's firs law?
|
Kepler's law that tell us that the orbit of each planet around the Sun is an ellipse with the Sun at at one focus. NOTE: nothing is at the other focus.
|
|
|
What is aphelion?
(from the Greek for "away from the Sun") |
the point at which an object orbiting the Sun is farthest from the Sun.
|
|
|
What is perihelion?
(from the Greek for "near the Sun") |
the point at which an object orbiting the Sun is closest to the Sun.
|
|
|
What is Kepler's second law?
|
Kepler's law states that as a planet moves around its orbit, it sweeps out equal area in equal time.
|
|
|
What is Kepler's third law?
|
Kepler's law tell us that more distant planets orbit the Sun at slower average speeds obeying a precise mathematical relationship.
p^2=a^3 "p" is the planet's orbital period in a years and "a" is its average distance from the Sun in astronomical units. |
