What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy
B) the dust that fills the halo of the Milky Way galaxy
C) the middle section of the Milky Way galaxy
D) the name of an oracle who can channel messages from beings that live near the star called Vega
A) the gas and dust that lies in between the stars in the Milky Way galaxy
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The efficiency of inexpensive solar cells is closest to
A. 1% B.12% c. 65% D. 100%
When rock is subjected to compressive force, it may fault. If rocks in the hanging wall are pushed up over rocks in the footwall, it is called a
A) reverse fault. B) strike slip fault. C) normal fault. D) none of the above
A 5-kg object is moving to the right at 4 m/s and collides with another object moving to the left at 5 m/s. The objects collide and stick together. After the collision, the combined object:
a. is moving to the right. b. is moving to the left. c. is at rest. d. has less kinetic energy than the system had before the collision.
The speed of sound varies with
A) loudness. B) frequency. C) wavelength. D) all of the above E) none of the above