Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon.
B) Recent, large impacts shattered lunar rock to make this soil.
C) It is made by the same processes that make powdery sand on Earth.
D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.
A) It is the result of countless tiny impacts by small particles striking the Moon.
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According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) decreases by a factor of 9. B) increases by a factor of 9. C) decreases by a factor of 3. D) increases by a factor of 3.
Which of the following most likely explains why Venus does not have a global magnetic field like Earth?
A) Its rotation is too slow. B) It does not have a metallic core. C) Unlike Earth, Venus does not have a liquid outer core. D) It has too thick of an atmosphere.
All meteorites collected on Earth come from asteroids or comets
Indicate whether the statement is true or false
A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
a. 2.0 s b. 6.1 s c. 3.5 s d. 1.6 s e. 1.0 s