The source of a sonic boom may be a
A) whip.
B) a high-speed bullet.
C) both of these
D) neither of these
Answer: B
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Which of these gases are outgassed from our volcanic eruptions?
A) oxygen, methane, ammonia B) carbon dioxide, water vapor, oxygen C) ammonia, water vapor, oxygen D) water vapor, methane, carbon dioxide E) helium, carbon dioxide, methane
Suppose that Earth's ice caps melted, but everything else about the Earth's surface and atmosphere stayed the same. What would happen to Earth's average surface temperature?
A) The temperature would not be affected at all. B) The surface temperature would decrease. C) The surface temperature would increase. D) The surface temperature would change radically, until it was equal to the melting temperature of ice.
Scientific models are used to
A) present the scale of the solar system to the general public. B) make specific predictions that can be tested through observations or experiments. C) make miniature representations of the universe. D) prove that past paradigms no longer hold true.
A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
a.
W/L
b.
L/W
c.
d.
e.