How many moons does Mars have?
A) none
B) one
C) two
D) three
E) four
C
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Kepler's analysis of planetary motion showed that the planets move _______________ when close to the Sun and _______________ when farther away
Fill in the blank(s) with correct word
Which person realized the laws of gravity applied to objects both on Earth and in space?
A) Newton B) Copernicus C) Kepler D) Galileo
The spectra of interstellar gas clouds show that they have the same basic composition as
A) Earth's atmosphere. B) stars. C) asteroids. D) interstellar dust. E) the Martian polar caps.
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
a.
The gravitational potential energy of the system is greatest at A and B.
b.
The kinetic energy of mass m is greatest at point O.
c.
The greatest rate of change of momentum occurs at A and B.
d.
All of the above are correct.
e.
Only (a) and (b) above are correct.