Physics Principles and Problems 2009

Chapter 7: Gravitation

Standardized Test Practice

1
Which of the following was first correctly predicted by Einstein's theory of gravity?
A)E = mc2
B)the value for G
C)how much light bends as it passes massive objects
D)the origin of mass
2
An object weighs 250 N on Earth's surface. When it is moved to a point one Earth radius above Earth's surface, how much will it weigh?
A)1000 N
B)250 N
C)130 N
D)63 N
3
The weight of an object was determined at five different distances from the center of Earth. The results are shown in the table below. Position A represents the results for the object at the surface of Earth.

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The approximate mass of the object is
  Need a Hint?
A)0.01 kg
B)10 kg
C)100 kg
D)1000 kg
4
The weight of an object was determined at five different distances from the center of Earth. The results are shown in the table below. Position A represents the results for the object at the surface of Earth.

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At what distance from the center of Earth is the weight of the object approximately 32 N?
A)3.5 x 107 m
B)3.8 x 107 m
C)4.1 x 107 m
D)4.5 x 107 m
5
The gravitational field on the surface of planet X is 19.6 N/kg. If an object has a mass of 65.0 kg, how much will the object weigh on the surface of planet X?
A)3.32 N
B)65.0 N
C)130 N
D)1270 N
6
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The table above provides information about the orbits of five planets. According to Kepler's third law, what is the period of planet A's orbit?
A)3.28 y
B)1.52 y
C)0.54 y
D)0.25 y
7
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The table above provides information about the orbits of five planets. What is planet D's mean distance from the Sun?
  Need a Hint?
A)1.2 AU
B)1.4 AU
C)1.5 AU
D)2.8 AU
8
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The diagram shows the circular orbit of a satellite around Earth. What is the satellite's orbital speed?
  Need a Hint?
A)5.84 x 107 m/s
B)6.31 x 104 m/s
C)7.23 x 103 m/s
D)7.65 x 103 m/s
9
How would the satellite's speed be affected if the orbital radius were increased by a factor of 4?
A)multiplied by √2
B)multiplied by 2
C)divided by 4
D)divided by 2
10
A planet has a mass of 8.4 x 1024 kg, which is about eight times the mass of its single moon. If the distance between the planet and the moon is about 4.2 x 105 km, what is the approximate gravitational pull of the planet on the moon?
  Need a Hint?
A)3.3 × 1021 N
B)2.1 × 1023 N
C)3.3 × 1027 N
D)2.1 × 1029 N
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