Transcript Planetary Motion Review with answers

Kepler’s first law of
planetary motion says that
the paths of the planets
are
A. Parabolas
B. Hyperbolas
C. Ellipses
D. Circles
Ans: C
Ans: D
A planet orbiting the sun
a.
b.
c.
d.
Maintains the same
distance from the sun
Moves at a constant
speed
Moves faster when it is
farther from the sun
Moves faster when it is
closer to the sun
Newton’s law of universal
gravitation states that the
gravitational force between
two bodies is Ans: D
A.
B.
C.
D.
Directly proportional to the
distance between them
Directly proportional to the square
of the distance between them
Inversely proportional to the
distance between them
Inversely proportional to the square
of the distance between them
Two moons orbit a planet.
The average orbital radius of
the outer moon is 1.8 times
that of the inner moon. The
orbital period of the outer
Ans: C
moon is
a. 0.56 times that of the inner
b.
c.
d.
moon
1.8 times that of the inner moon
2.4 times that of the inner moon
5.8 times that of the inner moon
The center of mass A of an object is
0.48 m from the center of mass B of
another object. How much greater
would the gravitational force between
the two masses be if their centers were
only 0.12 m apart?
Ans: D
A. 2
times greater
B. 4 times greater
C. 8 times greater
D. 16 times greater
The mass of Earth is approximately
6.0 x 1024 kg. What would the
acceleration due to gravity be on the
surface of planet Q which has a mass
of 5.0 x 1024 kg and a radius equal to
the radius of Earth?
6.8
2
B. 8.2 m/s
C. 9.8 m/s2
D. 12 m/s2
A.
2
m/s
Ans: B
Two satellites orbit the Earth at
the same altitude in circular
orbits. One satellite has a mass
of 450 kg, and the other has a
mass of 150 kg. The orbital speed
of the larger satellite is
A.
B.
C.
D.
The same as the speed of the smaller
satellite
1.7 times the speed of the smaller
satellite
3.0 times the speed of the smaller
satellite
9.0 times the speed of the smaller
Ans: A
satellite
What is the acceleration
due to gravity at an
altitude of 4.0 Earth radii
above the surface of
Earth?
A. 0.39 m/s2
B. 2.0 m/s2
Ans: A
C. 2.4 m/s2
2
D. 9.8 m/s
Two cans of soda are next to
each other on a table. If the
mass of each can of soda is
0.355 kg and their centers are
0.08 m apart, what is the
gravitational force between
them?
20 N
-3
B. 2.0 x 10 N
C. 1.3 x 10-9 N
D. 1.3 x 10-13 N
A.
Ans: C
Suppose that in the distant future,
astronauts are exploring a planet in
another solar system. They find that
the radius of the planet is 7.8 x 103 km
and the acceleration due to gravity on
its surface is 12.3 m/s2. What is the
mass of the planet?
1.1
B. 6.0
C. 1.1
D. 6.0
A.
x
x
x
x
1019 kg
1024 kg
1025 kg
26
10 kg
Ans: C
A satellite orbits Earth 3,250,000
m above the Earth’s surface. What
is the satellite’s orbital speed?
A. 6440
m/s
B. 7330 m/s
C. 7920 m/s
D. 1110 m/s
Ans: A
A satellite orbits a planet in a
circular orbit. If the orbital radius
is 7.8 x 108 m and the time
required for a complete revolution
is 3.5 x 106 S, what is the orbital
speed?
A. 140 m/s
B. 2200 m/s
Ans: E
C. 4500 m/s
D. 7000 m/s
E. 1400 m/s