Question 1

_________ may have been instrumental in shaping the interface between Earth's land and oceans where the chemistry needed to develop life may have occurred.

Accepted Answer

A) Meteor showers 
B) Collisions with comets 
C) Earth's Moon 
D) Techtonic activity 
E) A collision with a Mars-sized object 
A) Meteor showers 
B) Collisions with comets 
C) Earth's Moon 
D) Techtonic activity 
E) A collision with a Mars-sized object

Question 2

How does the force of gravity between the Sun and Mercury compare to the gravitational force between the Sun and the Earth? Note that the semimajor axis of Mercury's orbit is 0.4 AU,and Mercury's mass is 0.06 times the mass of the Earth.

Accepted Answer

For a planet,the force of gravity betwee

Question 3

Once two objects are far enough away from each other,they no longer exert any gravitational attraction on each other.

Accepted Answer

A) True 
 B)False

Question 4

If an object is moving in a circular orbit at a constant speed,which of the following is FALSE?

Accepted Answer

A) Its acceleration is not zero. 
B) Its acceleration is zero. 
C) Its velocity is not zero. 
D) There is an unbalanced force acting on it. 
E) All the above statements are true. 
A) Its acceleration is not zero. 
B) Its acceleration is zero. 
C) Its velocity is not zero. 
D) There is an unbalanced force acting on it. 
E) All the above statements are true.

Question 5

Which of the statements below are TRUE about the Roche limit of a giant planet?

Accepted Answer

A) It is about equal to the radius of the planet. 
B) It is the closest to the planet that moons normally are found. 
C) It is the closest to the planet that rings will be found. 
D) It is the farthest from the planet that moons normally are found. 
E) Because they have no solid surfaces,giant planets do not have a Roche limit. 
A) It is about equal to the radius of the planet. 
B) It is the closest to the planet that moons normally are found. 
C) It is the closest to the planet that rings will be found. 
D) It is the farthest from the planet that moons normally are found. 
E) Because they have no solid surfaces,giant planets do not have a Roche limit.

Question 6

The Earth's rotation rate is slowing because of:

Accepted Answer

A) radioactive decays in its core 
B) relativistic effects of gravity 
C) tidal forces from the Moon 
D) the gravitational force of the Sun 
E) gravitational drag from dark matter 
A) radioactive decays in its core 
B) relativistic effects of gravity 
C) tidal forces from the Moon 
D) the gravitational force of the Sun 
E) gravitational drag from dark matter

Question 7

If the distance between the Earth and Sun were cut in half,the gravitational force between these two objects would:

Accepted Answer

A) decrease by 4 
B) decrease by 2 
C) increase by 2 
D) increase by 4 
E) decrease by 8 
A) decrease by 4 
B) decrease by 2 
C) increase by 2 
D) increase by 4 
E) decrease by 8

Question 8

How would the acceleration due to gravity on a planet that is 16 times as massive as Earth and 4 times its radius compared to the acceleration of gravity on the Earth?

Accepted Answer

For that planet,the accelerati

Question 9

According to the scales in the figure,about how many times stronger is gravity on Earth than on the Moon?

Accepted Answer

A) 20 
B) 3 
C) 2 
D) 6 
E) They are the same. 
A) 20 
B) 3 
C) 2 
D) 6 
E) They are the same.

Question 10

The Moon always keeps the same face toward Earth because of:

Accepted Answer

A) tidal locking 
B) tidal forces from the Sun 
C) tidal forces from Earth 
D) tidal forces from the Earth and Sun 
E) all sides of the moon face Earth at one time or another 
A) tidal locking 
B) tidal forces from the Sun 
C) tidal forces from Earth 
D) tidal forces from the Earth and Sun 
E) all sides of the moon face Earth at one time or another

Question 11

Tidal forces are caused by:

Accepted Answer

A) the weight of the water in the oceans on the ocean floor 
B) the strength of the gravitation pull of the Moon on Earth 
C) the difference between the weight of the water on the ocean floor at high and low tide 
D) the difference between the strength of the gravitiational pull of the Moon and Sun on either side of Earth 
E) the strength of the gravitation pull of the Moon and the Sun on Earth 
A) the weight of the water in the oceans on the ocean floor 
B) the strength of the gravitation pull of the Moon on Earth 
C) the difference between the weight of the water on the ocean floor at high and low tide 
D) the difference between the strength of the gravitiational pull of the Moon and Sun on either side of Earth 
E) the strength of the gravitation pull of the Moon and the Sun on Earth

Question 12

If you found an exoplanet whose mass was the same as Jupiter's,but the planet orbited its star with a period of 2 years and a semimajor axis of 1 AU,what would be the mass of its star? For reference,Jupiter has a semimajor axis of 5.4 AU and an orbital period of 12 years.

Accepted Answer

A) 0.25 M⨀ 
B) 0.5 M⨀ 
C) 2.0 M⨀ 
D) 1.5 M⨀ 
E) not enough information available to answer 
A) 0.25 M⨀ 
B) 0.5 M⨀ 
C) 2.0 M⨀ 
D) 1.5 M⨀ 
E) not enough information available to answer

Question 13

Is there a difference in your weight between when you are on top of a mountain at 1,000 meters above sea level compared to when you are sitting in a classroom at 10 meters above sea level?

Accepted Answer

Yes,you weigh less on the mountaintop be

Question 14

Explain why the Moon rotates in the same amount of time as it takes to orbit once around the Earth.

Accepted Answer

The Moon's tidal locking is ca

_________ may have been instrumental in shaping the interface between Earth's land and oceans where the chemistry needed to develop life may have occurred.

How does the force of gravity between the Sun and Mercury compare to the gravitational force between the Sun and the Earth? Note that the semimajor axis of Mercury's orbit is 0.4 AU,and Mercury's mass is 0.06 times the mass of the Earth.

Once two objects are far enough away from each other,they no longer exert any gravitational attraction on each other.

If an object is moving in a circular orbit at a constant speed,which of the following is FALSE?

Which of the statements below are TRUE about the Roche limit of a giant planet?

The Earth's rotation rate is slowing because of:

If the distance between the Earth and Sun were cut in half,the gravitational force between these two objects would:

How would the acceleration due to gravity on a planet that is 16 times as massive as Earth and 4 times its radius compared to the acceleration of gravity on the Earth?

According to the scales in the figure,about how many times stronger is gravity on Earth than on the Moon?

The Moon always keeps the same face toward Earth because of:

Tidal forces are caused by:

If you found an exoplanet whose mass was the same as Jupiter's,but the planet orbited its star with a period of 2 years and a semimajor axis of 1 AU,what would be the mass of its star? For reference,Jupiter has a semimajor axis of 5.4 AU and an orbital period of 12 years.

Is there a difference in your weight between when you are on top of a mountain at 1,000 meters above sea level compared to when you are sitting in a classroom at 10 meters above sea level?

Explain why the Moon rotates in the same amount of time as it takes to orbit once around the Earth.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 4: Gravity and Orbits

_________ may have been instrumental in shaping the interface between Earth's land and oceans where the chemistry needed to develop life may have occurred.

How does the force of gravity between the Sun and Mercury compare to the gravitational force between the Sun and the Earth? Note that the semimajor axis of Mercury's orbit is 0.4 AU,and Mercury's mass is 0.06 times the mass of the Earth.

Once two objects are far enough away from each other,they no longer exert any gravitational attraction on each other.

If an object is moving in a circular orbit at a constant speed,which of the following is FALSE?

Which of the statements below are TRUE about the Roche limit of a giant planet?

The Earth's rotation rate is slowing because of:

If the distance between the Earth and Sun were cut in half,the gravitational force between these two objects would:

How would the acceleration due to gravity on a planet that is 16 times as massive as Earth and 4 times its radius compared to the acceleration of gravity on the Earth?

According to the scales in the figure,about how many times stronger is gravity on Earth than on the Moon?

The Moon always keeps the same face toward Earth because of:

Tidal forces are caused by:

If you found an exoplanet whose mass was the same as Jupiter's,but the planet orbited its star with a period of 2 years and a semimajor axis of 1 AU,what would be the mass of its star? For reference,Jupiter has a semimajor axis of 5.4 AU and an orbital period of 12 years.

Is there a difference in your weight between when you are on top of a mountain at 1,000 meters above sea level compared to when you are sitting in a classroom at 10 meters above sea level?

Explain why the Moon rotates in the same amount of time as it takes to orbit once around the Earth.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters