Unit Test — Unit test Answers
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The image shows Earth’s orbit around the Sun.
A
The speed increases from W to X because a component of the gravitational force acts in the direction opposite to the velocity.B
The speed increases from W to X because a component of the gravitational force acts in the direction of the velocity.C
The speed increases from X to W because a component of the gravitational force acts in the direction opposite to the velocity.D
The speed increases from X to W because a component of the gravitational force acts in the direction of the velocity.22
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Which is most likely why many scientists reject the cold fusion theory?
A
There is too much waste involved in the process.B
Cold fusion experiments have been conducted at room temperature only.C
The process does not produce enough energy to meet the needs of modern humans.D
The original results have not been replicated consistently and reliably.23
Which describes redshifts? Check all that apply.
A
The light source and observer move closer together.B
Observed light shifts to a longer wavelength.C
They indicate receding galaxies.D
Observed light shifts to a shorter wavelength.E
The light source and observer move farther apart.F
They indicate approaching galaxies.24
How does critical mass play a role in nuclear reactions?
A
It is the minimum amount of material needed to start a fission reaction.B
It is the minimum amount of material needed to start a fusion reaction.C
It is the minimum amount of material needed to sustain a fission reaction.D
It is the minimum amount of material needed to sustain a fusion reaction.25
Which statements describe the relationship of Earth and its moon? Check all that apply.
A
The moon orbits Earth following a nearly circular path.B
The gravitational pull of Earth on the moon is parallel to the velocity of the moon.C
The moon orbits Earth in 1 Earth day.D
The same face of the moon always points toward Earth.E
The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.Did you find these answers helpful?
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