Chapter Resources
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Chapter
7
physicspp.com
Image Bank
Video Clipsand Animations
Standardized Test Practice
Chapter Assessment Questions
Chapter Summary
Transparencies
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Chapter Resources
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Chapter
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Comet Hale-Bopp
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Planetary Data
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Sketch of Orbits of Lo and Callisto
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Universal Gravitation and Kepler’s Third Law
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Cavendish Balance
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Orbits of Planets and Satellites
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Landsat 7
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Sketching Satellite’s Orbit Around Earth
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Astronaut Chiaki Mukai Experiencing Weightlessness Aboard Space Shuttle Columbia
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The Gravitational Field
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Vectors Representing Earth’s Gravitational Field
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Inertial Balance
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Rubber Sheet Illustrating Effect of Mass on Space
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Deflection of Light
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Chandra X-ray Image of Two Black Holes
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Standardized Test Practice (Q. 2)
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Standardized Test Practice (Q. 5)
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Chapter
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Kepler’s First Law
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Kepler’s Second Law
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Kepler’s Third Law
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Newton’s Law of Universal Gravitation
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Inverse Square Law
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Cavendish Experiment
Chapter
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Orbits of Planets and Satellites
Chapter
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Two Kinds of Mass
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Kepler’s first law states that the paths of the planets are ellipses, with Sun at one focus.
Kepler’s second law states that an imaginary line from the Sun to a planet sweeps out equal areas in equal time intervals.
Kepler’s third law states that the square of the ratio of the periods of any two planets revolving about the Sun is equal to the cube of the ratio of their average distances from the Sun.
Planetary Motion and Gravitation
Section
7.1 Chapter Summary
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Newton’s law of universal gravitation states that the gravitational force between any two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The force is attractive and along a line connecting their centers.
Planetary Motion and Gravitation
Section
7.1 Chapter Summary
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Newton’s law of universal gravitation can be used to rewrite Kepler’s third law to relate the radius and period of a planet to the mass of the Sun.
Planetary Motion and Gravitation
Section
7.1 Chapter Summary
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Chapter Summary
The speed of an object in circular orbit is given by the following expression:
Using the Law of Universal Gravitation
Section
7.2
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Chapter Summary
The period of a satellite in a circular orbit is given by the following expression:
Using the Law of Universal Gravitation
Section
7.2
All objects have gravitational field surrounding them.
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Chapter Summary
Gravitational mass and inertial mass are two essentially different concepts. The gravitational and inertial masses of an object, however, are numerically equal.
Using the Law of Universal Gravitation
Section
7.2
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Chapter Summary
Einstein’s general theory of relativity describes gravitational attraction as a property of space itself.
Using the Law of Universal Gravitation
Section
7.2
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________ states that objects attract other objects with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.
Question 1
A. Kepler’s first law
B. Kepler’s second law
C. Kepler’s third law
D. Newton’s law of universal gravitation
Chapter
7 Chapter Assessment Questions
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Chapter Assessment Questions
Answer: D
Answer 1
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7
Reason: According to Newton’s law of universal gravitation:
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A satellite orbiting Earth over the equator appears to remain over one spot to an observer on Earth. What is its orbital speed?
Question 2
A. Equal to Earth’s orbital speed around Sun
B. Equal to Earth’s rate of rotation
C. Zero
D. Data insufficient
Chapter
7 Chapter Assessment Questions
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Chapter Assessment Questions
Answer: B
Answer 2
Chapter
7
Reason: When the satellite’s orbital speed matches with Earth’s rate of rotation, the satellite appears to remain over one spot on the equator.
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Chapter Assessment Questions
Describe a gravitational field.
Question 3
Chapter
7
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Chapter Assessment Questions
Any object with mass is surrounded by a gravitational field in which another object experiences a force due to the interaction between its mass and the gravitational field, g, at its location.
Answer 3
Chapter
7
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Chapter Assessment Questions
Differentiate between inertial mass and gravitational mass.
Question 4
Chapter
7
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Chapter Assessment Questions
Mass related to the inertia of an object is inertial mass. Inertial mass is equal to the ratio of the net force exerted on an object to its acceleration.
Mass as used in the law of universal gravitation determines the size of the gravitational force between two objects and is called gravitational mass.
Answer 4
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7
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If a lift carrying a person starts to fall freely toward Earth, the contact force between the lift and the person inside the lift will be equal to:
Question 5
A. Weight of the person
B. Weight of the lift
C. Zero
D. Gravitational force between the lift and Earth
Chapter
7 Chapter Assessment Questions
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Chapter Assessment Questions
Answer: C
Answer 5
Chapter
7
Reason: In a free fall toward Earth both, the lift and the person inside it are falling toward Earth with the same acceleration. Hence, the person experiences weightlessness.
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Standardized Test Practice
1. Two satellites are in orbit around a planet. One satellite has an orbital radius of 8.0×106 m. The period of rotation for this satellite is 1.0×106 s. The other satellite has an orbital radius of 2.0×107 m. What is this satellite’s period of rotation?
Multiple Choice
Chapter
7
A. 5.0×105 s
B. 2.5×106 s
C. 4.0×106 s
D. 1.3×107 s
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2. The illustration on the right shows a satellite in orbit around a small planet. The satellite’s orbital radius is 6.7×104 km and its speed is 2.0×105 m/s. What is the mass of the planet around which the satellite orbits? (G = 6.7×10−11 N·m2/kg2)
Multiple Choice
Standardized Test Practice
A. 2.5×1018 kg
B. 2.5×1023 kg
C. 4.0×1020 kg
D. 4.0×1028 kg
Chapter
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Standardized Test Practice
3. Two satellites are in orbit around the same planet. Satellite A has a mass of 1.5×102 kg, and satellite B has a mass of 4.5×103 kg. The mass of the planet is 6.6×1024 kg. Both satellites have the same orbital radius of 6.8×106 m. What is the difference in the orbital periods of the satellites?
Multiple Choice
Chapter
7
A. No difference
B. 1.5×102 s
C. 2.2×102 s
D. 3.0×102 s
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Standardized Test Practice
4. A moon revolves around a planet with a speed of 9.0×103 m/s. The distance from the moon to the center of the planet is 5.4×106 m. What is the orbital period of the moon?
Multiple Choice
Chapter
7
A. 1.2π×102 s
B. 6.0π×102 s
C. 1.2π×103 s
D. 1.2π×109 s
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Standardized Test Practice
5. A moon in orbit around a planet experiences a gravitational force not only from the planet, but also from the Sun. The illustration on the next slide shows a moon during a solar eclipse, when the planet, the moon, and the Sun are aligned. The moon has a mass of about 3.9×1021 kg. The mass of the planet is 2.4×1026 kg, and the mass of the Sun is 2.0×1030 kg. The distance from the moon to the center of the planet is 6.0×108 m, and the distance from the moon to the Sun is 1.5×1011 m. What is the ratio of the gravitational force on the moon due to the planet, compared to its gravitational force due to the Sun during the solar eclipse?
Extended Answer
Chapter
7
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Multiple Choice
Standardized Test Practice
A. 0.5
B. 2.5
C. 5.0
D. 7.5
Chapter
7
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Standardized Test Practice
6. Two satellites are in orbit around a planet. Satellite S1 takes 20 days to orbit the planet at a distance of 2×105 km from the center of the planet. Satellite S2 takes 160 days to orbit the planet. What is the distance of satellite S2 from the center of the planet?
Extended Answer
Chapter
7
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Standardized Test Practice
Plan Your Work and Work Your Plan
Test-Taking Tip
Chapter
7
Plan your workload so that you do a little work each day, rather than a lot of work all at once. The key to retaining information is repeated review and practice. You will retain more if you study one hour a night for five days in a row instead of cramming the night before a test.
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End of Chapter Resource File
Chapter
7 Chapter Resources