Question 1

Roughly how often does a high tide occur?

Accepted Answer

A)  Once every 6 hours 
B)  Once every 12 hours 
C)  Once every 18 hours 
D)  Once every 24 hours 
A)  Once every 6 hours 
B)  Once every 12 hours 
C)  Once every 18 hours 
D)  Once every 24 hours

Question 2

What are the fewest high tides it is possible to have in one day?

Accepted Answer

A)  Zero 
B)  One 
C)  Two 
D)  Three 
A)  Zero 
B)  One 
C)  Two 
D)  Three

Question 3

The force of gravity at the center of Earth,compared to its surface gravity,is equal to

Accepted Answer

A)    . 
B)    . 
C)    . 
D)  zero. 
A)    . 
B)    . 
C)    . 
D)  zero.

Question 4

Gaps in Saturn's rings are caused by

Accepted Answer

A)  shepherd moons. 
B)  orbital resonances. 
C)  moons that collide with material and clear out their orbit. 
D)  All of the above 
A)  shepherd moons. 
B)  orbital resonances. 
C)  moons that collide with material and clear out their orbit. 
D)  All of the above

Question 5

If a moon wanders closer than approximately 5 times the radius of a planet,the moon will likely be torn apart by tidal forces.

Accepted Answer

A) True 
 B)False

Question 6

High tides occur twice every 25 hours.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following orbital periods for asteroids would NOT be associated with one of the Kirkwood gaps given that Jupiter's orbital period is 11.9 years?

Accepted Answer

A)  5.95 years 
B)  4.76 years 
C)  3.97 years 
D)  3.72 years 
A)  5.95 years 
B)  4.76 years 
C)  3.97 years 
D)  3.72 years

Question 8

The Cassini Division in the rings of Saturn occurs because particles that would orbit in the gap would have a 2:1 orbital resonance with Mimas,one of Saturn's moons.If Mimas' orbital period is 0.94 days and its semimajor axis is 186,000 km,then what is the semimajor axis of the Cassini Division?

Accepted Answer

Because @#IMG-DLM& applies for

Question 9

The fact that the Earth is elastic and responds to the Moon's tidal stress by bulging causes the Earth's rotation speed to gradually increase over time.

Accepted Answer

A) True 
 B)False

Question 10

In the past,the Moon was closer to the Earth and the difference in the heights of the ocean at high and low tides were

Accepted Answer

A)  the same. 
B)  larger. 
C)  smaller. 
D)  Tides were nonexistent in the past. 
A)  the same. 
B)  larger. 
C)  smaller. 
D)  Tides were nonexistent in the past.

Question 11

Saturn's ring system has a very sharp outer edge because

Accepted Answer

A)  particles at the edge have a 7:6 orbital resonance with a pair of co-orbiting moons that lie just outside the rings. 
B)  the edge marks the Roche limit. 
C)  of a pair of shepherding moons. 
D)  Saturn has a thicker atmosphere than Earth. 
A)  particles at the edge have a 7:6 orbital resonance with a pair of co-orbiting moons that lie just outside the rings. 
B)  the edge marks the Roche limit. 
C)  of a pair of shepherding moons. 
D)  Saturn has a thicker atmosphere than Earth.

Question 12

How has the Moon affected Earth's axial tilt?

Accepted Answer

A)  It is because of the Moon that Earth's axis is tilted relative to its orbital plane. 
B)  It is because of the Moon that Earth's axial tilt is relatively steady. 
C)  It is because of the Moon that Earth's axial tilt is slowly increasing over time. 
D)  It is because of the Moon that Earth's axial tilt varies chaotically over large time scales. 
A)  It is because of the Moon that Earth's axis is tilted relative to its orbital plane. 
B)  It is because of the Moon that Earth's axial tilt is relatively steady. 
C)  It is because of the Moon that Earth's axial tilt is slowly increasing over time. 
D)  It is because of the Moon that Earth's axial tilt varies chaotically over large time scales.

Question 13

Consider the tidal force at the Earth's North Pole due to the Moon.The tidal force is pointed directly

Accepted Answer

A)  toward the Moon. 
B)  toward the center of the Earth. 
C)  away from the center of the Earth. 
D)  away from the Moon. 
A)  toward the Moon. 
B)  toward the center of the Earth. 
C)  away from the center of the Earth. 
D)  away from the Moon.

Question 14

The tidal stress on a moon as it orbits a planet can heat the moon's core hot and keep it from solidifying.

Accepted Answer

A) True 
 B)False

Question 15

If the mass of the Sun is roughly 30,000,000 times greater than the mass of the Moon,and its distance is roughly 400 times farther,estimate the strength of the Sun's tidal forces compared to the Moon's tidal forces.

Accepted Answer

Tidal forces are proportional

Question 16

What causes the tides on Earth,and how frequently do high and low tides occur?

Accepted Answer

Tides are caused predominantly by the ti

Question 17

Based on the length of a lunar cycle,if there is a spring tide today,how long will it be until the next spring tide?

Accepted Answer

A)  About three to four days 
B)  One week 
C)  Two weeks 
D)  One month 
A)  About three to four days 
B)  One week 
C)  Two weeks 
D)  One month

Question 18

When the Earth's rotation slows because of tidal effects due to the Moon,in order to conserve orbital angular momentum,

Accepted Answer

A)  the Moon's distance will increase. 
B)  the Moon's distance will decrease. 
C)  the Moon's orbital speed will decrease. 
D)  the Moon's rotation rate will increase. 
A)  the Moon's distance will increase. 
B)  the Moon's distance will decrease. 
C)  the Moon's orbital speed will decrease. 
D)  the Moon's rotation rate will increase.

Question 19

How does the size of the tidal force on the Earth due to the Moon compare with the tidal force on the Moon due to the Earth? Recall that the Earth's diameter is approximately 4 times that of the Moon,and Earth's mass is approximately 80 times that of the Moon.

Accepted Answer

A)  They are exactly the same. 
B)  The tidal force on the Earth is 4 times that on the Moon. 
C)  The tidal force on the Moon is 20 times that on the Earth. 
D)  The tidal force on the Moon is 4 times that on the Earth. 
A)  They are exactly the same. 
B)  The tidal force on the Earth is 4 times that on the Moon. 
C)  The tidal force on the Moon is 20 times that on the Earth. 
D)  The tidal force on the Moon is 4 times that on the Earth.

Question 20

The Cassini Division in Saturn's rings is caused by an orbital resonance with its moon named

Accepted Answer

A)  Titan. 
B)  Mimas. 
C)  Triton. 
D)  Dione. 
A)  Titan. 
B)  Mimas. 
C)  Triton. 
D)  Dione.

Exam 10: Gravity Is More Than Keplers Laws

Roughly how often does a high tide occur?

What are the fewest high tides it is possible to have in one day?

The force of gravity at the center of Earth,compared to its surface gravity,is equal to

Gaps in Saturn's rings are caused by

If a moon wanders closer than approximately 5 times the radius of a planet,the moon will likely be torn apart by tidal forces.

High tides occur twice every 25 hours.

Which of the following orbital periods for asteroids would NOT be associated with one of the Kirkwood gaps given that Jupiter's orbital period is 11.9 years?

The Cassini Division in the rings of Saturn occurs because particles that would orbit in the gap would have a 2:1 orbital resonance with Mimas,one of Saturn's moons.If Mimas' orbital period is 0.94 days and its semimajor axis is 186,000 km,then what is the semimajor axis of the Cassini Division?

The fact that the Earth is elastic and responds to the Moon's tidal stress by bulging causes the Earth's rotation speed to gradually increase over time.

In the past,the Moon was closer to the Earth and the difference in the heights of the ocean at high and low tides were

Saturn's ring system has a very sharp outer edge because

How has the Moon affected Earth's axial tilt?

Consider the tidal force at the Earth's North Pole due to the Moon.The tidal force is pointed directly

The tidal stress on a moon as it orbits a planet can heat the moon's core hot and keep it from solidifying.

If the mass of the Sun is roughly 30,000,000 times greater than the mass of the Moon,and its distance is roughly 400 times farther,estimate the strength of the Sun's tidal forces compared to the Moon's tidal forces.

What causes the tides on Earth,and how frequently do high and low tides occur?

Based on the length of a lunar cycle,if there is a spring tide today,how long will it be until the next spring tide?

When the Earth's rotation slows because of tidal effects due to the Moon,in order to conserve orbital angular momentum,

How does the size of the tidal force on the Earth due to the Moon compare with the tidal force on the Moon due to the Earth? Recall that the Earth's diameter is approximately 4 times that of the Moon,and Earth's mass is approximately 80 times that of the Moon.

The Cassini Division in Saturn's rings is caused by an orbital resonance with its moon named

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

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 Liquidthe Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

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