Universal Law of Gravitation — Unit test Answers
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Alana drew a diagram to compare the life cycles of low-mass and high-mass stars.
A
X: Nuclear fusion forms hydrogen in the main sequence star.Y: A white dwarf is part of the cycle.Z: A supernova is part of the cycle.B
X: A white dwarf is part of the cycle.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A supernova is part of the cycle.C
X: A protostar is part of the cycle.Y: It begins in a nebula.Z: nuclear fusion forms hydrogen in the main sequence star.D
X: It begins in a nebula.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A protostar is part of the cycle.22
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According to most scientists, cold fusion
A
will not be a practical source of energy on Earth.B
would be a practical source of energy on Earth if it were less expensive.C
will be a practical source of energy on Earth within the next few decades.D
will always continue to be a practical source of energy on Earth.23
The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle?
A
hydrogenB
carbonC
heliumD
iron24
Kathy drew a timeline to show some of the major events that occurred during the evolution of the universe.Which best describes Kathy’s error?
A
Quarks and electrons formed at 10–35 s, not 10–10 s.B
Protons formed first, then neutrons formed at 100 s.C
Nebulae formed around 109 y after hydrogen and helium formed.D
Hydrogen and helium were created at 3000 s, before nebulae formed.25
Neptune has a mass that is about 17 times the mass of Earth. The distance between the Sun and Neptune is about 30.1 times the distance between the Sun and Earth.If the gravitational force between the Sun and Earth is 3.5 x 1028 N, which is closest to the force between Neptune and the Sun?
A
6 x N
B
6 x N
C
6 x N
D
6 x N
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