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17.1 Test Review
Test Description: Solar System Gravity Law of Universal Gravitation Orbit/Revolution Rotation Size/Distance
Instructions: Answer all questions to get your test result.
1) The Sun, planets and their moons, and a large collection of smaller objects such as asteroids, comets, and meteors are, together, called the:
A
galaxy
B
nebulae
C
solar system
D
universe
2) A unit used to measure long distances, equivalent to the distance from the Sun to Earth, is known as the:
A
sidereal year
B
light year
C
cosmic scale
D
astromonical unit
3) All of these objects in the night sky are seen because they reflect light EXCEPT:
A
Mercury
B
stars
C
venus
D
Earth's moon
4) The force of gravity between two objects will be greatest if their masses are:
A
small and they are close together.
B
large and they are far apart.
C
small and they far apart.
D
large and they are close together.
5) The length of a planet’s year is defined by its:
A
density
B
period of revolution
C
period of rotation
D
mass
6) The length of a planet’s day is defined by its:
A
period of revolution
B
density
C
period of rotation
D
mass
7) Orbital motion of the planets is caused by the interaction between inertia and:
A
frictional forces
B
gravitation force
C
the Sun's energy
D
the strong nuclear force
8) If an astronaut weisghts 1200 N on Earth, on the Moon he will weight about:
A
200 N
B
2400 N
C
100 N
D
400 N
9) The strength of the gravitational force between objects is determined by the distance between the objects and their
A
masses
B
densities
C
sizes
D
inertias
10) One AU is equivalent to 150 million kilometers. If Pluto is 40 AU from the Sun, how far is Pluto from the Sun measured in kilometers?
A
6,000,000 km
B
600 km
C
6,000,000,000 km
D
6,000,000
*select an answer for all questions
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