Question 14 1. Retrograde motions of planets as observed from Earth can be expla

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Question 14 1.

Retrograde motions of planets as observed from Earth can be explained:

a. if a planet that is closer to the Sun moves faster than those farther away from it.

b. if a planet that is closer to the Sun moves slower than those farther away from it.

c. when a planet’s orbital velocity is exactly equal to Earth’s velocity on its orbit.

d. because all planets move in the opposite direction with respect to Earth’s motion.

e. None of the above. 5 points Question

15 1.

The law of conservation of energy suggests that the total amount of energy in the universe:

a. can either decrease or increase.

b. can only increase with time.

c. can only decrease with time.

d. cannot change in time.

e. None of the above. 5 points Question

Question 16 1.

The scientific method requires that a researcher will:

a. collect and analyze data to find a pattern.

b. formulate a hypothesis and make predictions.

c. test predictions.

d. refine or discard of an original hypothesis based on new data.

e. Only A and B.

f. Only B and C.

g. All of the above.

h. None of the above. 5 points

Question 17 1.

Newton's Third Law is observed when:

a. a body moves along a straight trajectory with constant speed.

b. an astronaut experiences a free-fall.

c. two bodies interact with each other.

d. All of the above. e. None of the above.

Question 18 1.

Kepler's Second law states:

a. that the square of a planet’s orbital period is proportional to the cube of its distance to a central star.

b. that as a planet gets closer to its central star, it moves faster.

c. that a planetary path is an ellipse with the Sun at one of its foci.

d. the spin rate of a planet and its mass.

e. None of the above. 5 points

Question 19 1.

Escape velocity from a planet depends on

: a. the planet's atmospheric composition.

b. the planet's internal magnetic field.

c. the planet's mass-to-radius ratio.

d. the planet's crustal density.

e. All of the above.

f. Both B and D. 5 points

Question 20 1.

When Earth, the Moon, and Sun are aligned with respect to each other, then we should always observe:

a. the lowest tides called Neap Tides.

b. the highest tides called Spring Tides.

c. a solar eclipse.

d. a lunar eclipse.

e. All of the above. 5 points

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Explanation / Answer

14 d

15 d

16g

17 c

18e

19 f

20 e

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