The Permian period experienced major extinctions, which may have been due to
A) global warming.
B) the emergence of the reptile.
C) the breakup of Pangaea.
D) the formation of Pangaea.
Answer: D
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Consider a sphere with a positive charge uniformly distributed on its surface. The sphere spins clockwise around the z axis. The magnetic field this sphere creates is
A. unidirectional. B. circular. C. radial. D. None of the above.
A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
A) gas at the same temperature as the other jar. B) the hotter gas. C) gas at very high pressure. D) the cooler gas. E) the exact same gas as the other jar.
If two adjacent frequencies of an organ pipe closed at one end are 385 Hz and 578 Hz, what is the length of the organ pipe? (vsound = 340 m/s)
a. 0.44 m b. 0.59 m c. 1.4 m d. 0.88 m e. 1.8 m
The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________
a. sundial b. protractor c. declination d. right ascension