How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go)
B: About 600 times per second (fastest speed on a blender)
C: About 300 times per second (half the top speed of a blender)
D: About 60 times per second
E: Exactly once per second, like clockwork
Ans: B: About 600 times per second (fastest speed on a blender)
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The pitch of a sound is determined by
A) the amplitude. B) the speed. C) the frequency. D) the wavelength. E) none of the above
Our earliest atmosphere, formed by outgassing, was much poorer in ________ than now
A) carbon dioxide B) hydrogen C) oxygen D) methane E) nitrogen
Which will remain the same for two identical books, one lying flat and the other standing on an end?
A) weight only B) pressure only C) both pressure and weight D) none of the above
In which system is heat usually transferred from the cooler part to the warmer part?
a. a stove as it heats up water b. a refrigerator that is running c. an electric fan that is running d. none of the above, because it is impossible to transfer heat in this manner