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Chapter 12

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A satellite orbits the earth with constant speed at height above the surface equal to the earth’s radius. The magnitude of the satellite’s acceleration is gon earth. 2. gon earth. 3. gon earth. 4. 2gon earth. 5. 4gon earth. STT12.1

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A satellite orbits the earth with constant speed at height above the surface equal to the earth’s radius. The magnitude of the satellite’s acceleration is gon earth. 2. gon earth. 3. gon earth. 4. 2gon earth. 5. 4gon earth. STT12.1

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**The figure shows a binary star system**

The figure shows a binary star system. The mass of star 2 is twice the mass of star 1. Compared to , the magnitude of the force is 1. one quarter as big. 2. half as big. 3. twice as big. 4. four times as big. 5. the same size. STT12.2

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**The figure shows a binary star system**

The figure shows a binary star system. The mass of star 2 is twice the mass of star 1. Compared to , the magnitude of the force is 1. one quarter as big. 2. half as big. 3. twice as big. 4. four times as big. 5. the same size. STT12.2

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A planet has 4 times the mass of the earth, but the acceleration due to gravity on the planet’s surface is the same as on the earth’s surface. The planet’s radius is Re. Re. 3. Re. 4. 2Re. 5. 4Re. STT12.3

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A planet has 4 times the mass of the earth, but the acceleration due to gravity on the planet’s surface is the same as on the earth’s surface. The planet’s radius is Re. Re. 3. Re. 4. 2Re. 5. 4Re. STT12.3

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**1. Ue > Ua = Ub = Ud > Uc 2. Ub > Uc > Ua = Ud > Ue **

Rank in order, from largest to smallest, the absolute values |Ug| of the gravitational potential energies of these pairs of masses. The numbers give the relative masses and distances. In absolute value: 1. Ue > Ua = Ub = Ud > Uc 2. Ub > Uc > Ua = Ud > Ue 3. Ub > Uc > Ud > Ua > Ue 4. Ue > Ua = Ub >Uc > Ud 5. Ue > Ud > Ua > Ub = Uc STT12.4

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**1. Ue > Ua = Ub = Ud > Uc 2. Ub > Uc > Ua = Ud > Ue **

Rank in order, from largest to smallest, the absolute values |Ug| of the gravitational potential energies of these pairs of masses. The numbers give the relative masses and distances. In absolute value: 1. Ue > Ua = Ub = Ud > Uc 2. Ub > Uc > Ua = Ud > Ue 3. Ub > Uc > Ud > Ua > Ue 4. Ue > Ua = Ub >Uc > Ud 5. Ue > Ud > Ua > Ub = Uc STT12.4

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**Two planets orbit a star**

Two planets orbit a star. Planet 1 has orbital radius r1 and planet 2 has r2 = 4r1. Planet 1 orbits with period T1. Planet 2 orbits with period 1. T2 = T1/2. 2. T2 = T1. 3. T2 = 2T1. 4. T2 = 4T1. 5. T2 = 8T1. STT12.5

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**Two planets orbit a star**

Two planets orbit a star. Planet 1 has orbital radius r1 and planet 2 has r2 = 4r1. Planet 1 orbits with period T1. Planet 2 orbits with period 1. T2 = T1/2. 2. T2 = T1. 3. T2 = 2T1. 4. T2 = 4T1. 5. T2 = 8T1. STT12.5

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Chapter 12 Reading Quiz

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**Who discovered the basic laws of planetary orbits?**

1. Newton 2. Kepler 3. Faraday 4. Einstein 5. Copernicus IG12.1

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**Who discovered the basic laws of planetary orbits?**

1. Newton 2. Kepler 3. Faraday 4. Einstein 5. Copernicus IG12.1

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**What is geometric shape of a planetary or satellite orbit?**

1. Circle 2. Hyperbola 3. Sphere 4. Parabola 5. Ellipse IG12.2

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**What is geometric shape of a planetary or satellite orbit?**

1. Circle 2. Hyperbola 3. Sphere 4. Parabola 5. Ellipse IG12.2

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**The gravitational force between two objects of masses m1 and m2 that are separated by distance r is**

1. proportional to r. 2. proportional to 1/r. 3. proportional to 1/r2. 4. (m1 + m2)g. 5. (m1 + m2)G. IG12.3

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**The gravitational force between two objects of masses m1 and m2 that are separated by distance r is**

1. proportional to r. 2. proportional to 1/r. 3. proportional to 1/r2. 4. (m1 + m2)g. 5. (m1 + m2)G. IG12.3

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**The value of g at the height of the space shuttle’s orbit is**

m/s2. 2. slightly less than 9.8 m/s2. 3. much less than 9.8 m/s2 . 4. exactly zero. IG12.4

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**The value of g at the height of the space shuttle’s orbit is**

m/s2. 2. slightly less than 9.8 m/s2. 3. much less than 9.8 m/s2. 4. exactly zero. IG12.4

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