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Kepler'S Law
Quiz 3
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Q.1
What unit to we usually use to to measure a planet's orbital period?
year
astronomical unit
Q.2
What causes Earth’s year to be shorter than Jupiter’s year?
the shape of Earth’s orbit around the Sun
the mass and density of Jupiter
the distance between Earth and the Sun
What causes Earth’s year to be shorter than Jupiter’s year?
Q.3
What effect does increasing the distance between an ellipse’s foci have on the shape of an ellipse?
Increases eccentricity
no effect
Q.4
How can the position of the sun in earth's orbit be described?
The sun is at one of the two focal points of a slightly eccentric ellipse
The sun is at one of the two focal points of a highly eccentric ellipse
Q.5
Where will an object move at the greatest speed as it orbits the sun?
Aphelion
Between perihelion and aphelion
Perihelion
None of these
Q.6
What did Kepler discover about planets and their orbital speed?
Planets with the greatest mass will orbit the Sun with the fastest orbital speed.
Planets furthest from the Sun will orbit with the fastest orbital speed.
Planets closest to the Sun will orbit with the fastest orbital speed.
Planets with the least mass will orbit the Sun with the fastest orbital speed.
Q.7
Double the distance between two objects
4 times greater gravity attraction
2 times weaker gravity
4 times weaker gravity attraction
2 times greater gravity
Q.8
Double the product of the masses of two objects
4 times weaker gravity force
2 times weaker gravity force
4 times stronger gravity force
2 times stronger gravity force
Q.9
Which of the following can decrease the gravity between objects?
Remove mass
Decrease distance
0 h : 0 m : 1 s
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