The body which wiped out the dinosaurs was about:
A) as big as our Moon.
B) as big as one of Mars' moons.
C) a few hundred meters across.
D) as big as a 747.
E) as big as an SUV.
B
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Components: If a vector 
has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.
An organ pipe is 80.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 200 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 300 m/s B. 320 m/s C. 340 m/s D. 360 m/s E. 380 m/s
What was the most controversial issue surrounding the nature of the Universe during the Renaissance?
a. The movement of visible galaxies b. The origins of the Universe c. The number of planets in the Solar System d. The position of Earth in the Universe e. The existence of life on planets other than Earth
If air were a better conductor, at nighttime Earth would be
A) considerably colder. B) considerably warmer. C) not appreciably different in temperature.