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Knight_ch12

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```Chapter 12
A satellite orbits the earth with constant speed at height
above the surface equal to the earthвЂ™s radius. The
magnitude of the satelliteвЂ™s acceleration is
1. -gon earth.
2.
gon earth.
3. gon earth.
4. 2gon earth.
5. 4gon earth.
A satellite orbits the earth with constant speed at height
above the surface equal to the earthвЂ™s radius. The
magnitude of the satelliteвЂ™s acceleration is
1. -gon earth.
2.
gon earth.
3. gon earth.
4. 2gon earth.
5. 4gon earth.
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.
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.
A planet has 4 times the mass of the earth, but the
acceleration due to gravity on the planetвЂ™s surface is the
same as on the earthвЂ™s surface. The planetвЂ™s radius is
1.
Re.
2.
Re.
3. Re.
4. 2Re.
5. 4Re.
A planet has 4 times the mass of the earth, but the
acceleration due to gravity on the planetвЂ™s surface is the
same as on the earthвЂ™s surface. The planetвЂ™s radius is
1.
Re.
2.
Re.
3. Re.
4. 2Re.
5. 4Re.
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
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
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.
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.
Chapter 12
Who discovered the basic laws of planetary orbits?
1. Newton
2. Kepler
4. Einstein
5. Copernicus
Who discovered the basic laws of planetary orbits?
1. Newton
2. Kepler
4. Einstein
5. Copernicus
What is geometric shape of a planetary or satellite orbit?
1.
2.
3.
4.
5.
Circle
Hyperbola
Sphere
Parabola
Ellipse
What is geometric shape of a planetary or satellite orbit?
1.
2.
3.
4.
5.
Circle
Hyperbola
Sphere
Parabola
Ellipse
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.
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.
The value of g at the height of the
space shuttleвЂ™s orbit is
1. 9.8 m/s2.
2. slightly less than 9.8 m/s2.
3. much less than 9.8 m/s2 .
4. exactly zero.
The value of g at the height of the
space shuttleвЂ™s orbit is
1. 9.8 m/s2.
2. slightly less than 9.8 m/s2.
3. much less than 9.8 m/s2.
4. exactly zero.
```
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