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;
28 Cards in this Set
- Front
- Back
|
How did Greeks picture the universe? (Thales and Pythagoras)
|
The pictured stars being fixed on the inside of a large rotating sphere.
|
|
|
What did the Greeks call star groupings?
|
Constellations
|
|
|
What does "planet" mean?
|
Wanderer.
|
|
|
Describe Thales and Pythagoras's geometric model?
|
Earth was at the center of 8 perfect spheres of increasing size.
|
|
|
What changes did Ptolemy propose?
|
He added circles within circles to the geometric model.
|
|
|
What were the "circles within circles" called? What did they explain?
|
Epicycles
Retrograde motion of planets |
|
|
When did Copernicus propose his model?
|
15443
|
|
|
What was special about Copernicus's model?
|
It was a heliocentric model and he also proposed the moon
|
|
|
How did Greeks picture the universe? (Thales and Pythagoras)
|
The pictured stars being fixed on the inside of a large rotating sphere.
|
|
|
What did the Greeks call star groupings?
|
Constellations
|
|
|
What does "planet" mean?
|
Wanderer.
|
|
|
Describe Thales and Pythagoras's geometric model?
|
Earth was at the center of 8 perfect spheres of increasing size.
|
|
|
What changes did Ptolemy propose?
|
He added circles within circles to the geometric model.
|
|
|
What were the "circles within circles" called? What did they explain?
|
Epicycles
Retrograde motion of planets |
|
|
When did Copernicus propose his model?
|
15443
|
|
|
What was special about Copernicus's model?
|
It was a heliocentric model and he also proposed the moon circled the Earth.
|
|
|
What did Brahe do?
|
He accumulated data includding a Nova and a comet.
|
|
|
What did Brahe's findings prove?
|
The heavens were not constant.
|
|
|
Who was Kepler and what did he accomplish?
|
He was Brahe's assistant and he determined the celestial paths were not perfect circles.
|
|
|
What are Kepler's laws of planetary motion?
|
The orbit of every planet is an ellipse with the Sun at one of the two foci.
A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.[1] The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. |
|
|
Who were the first to use the term gravity?
|
The Greeks
|
|
|
Who performed the first experiments testing gravity?
|
Galileo.
|
|
|
What did Galileo establish about gravity?
|
He established that the acceleration due to gravity is constant and independent of mass.
|
|
|
Who linked Galileo's gravity and the Copernican model, and how?
|
Newton, using calculus (that he invented)
|
|
|
What does gravity depend on?
|
- Mass of two objects
- Inverse square of distance between objects |
|
|
What other effects did Newton's model have?
|
It predicted the existence of Neptune and Pluto
It explained tides It predicted artificial satellites and geosynchronous orbits |
|
|
What are differences from predictions in the path of planets called?
|
Perturbations
|
|
|
What did Neptune and Pluto explain?
|
The perturbations in Uranus.
|
