The northern Atlantic Ocean is the source region for the ______________ type of air mass
a. cA
b. cP
c. mP
d. mT
c
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Two-Source Interference of Sound: Two loudspeakers placed 6.00 m apart are driven in phase by an audio oscillator having a frequency range from 1908 Hz to 2471 Hz. A point P is located 4.70 m from one loudspeaker and 3.60 m from the other speaker. At what frequency of the oscillator does the sound reaching point P interfere constructively? The speed of sound is 344 m/s.
A. 2190 Hz B. 2420 Hz C. 2110 Hz D. 2340 Hz E. 2270 Hz
Uniform Electric Fields: Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10-19 C)
A. 2.4 × 10-19 J B. 4.8 × 10-19 J C. 7.2 × 10-19 J D. 9.6 × 10-19 J
Why are novae much more common than supernovae?
A. It takes a special type of white dwarf to go supernova, but any old white dwarf can go nova. B. Novae are actually brighter than supernovae and so are easier to find. C. A white dwarf's mass slowly decreases with each nova but the whole white dwarf is completely obliterated during a supernova D. Both B and C E. None of the above
Over time, the star-gas-star cycle leads the gas in the Milky Way to
A) have a greater abundance of heavy elements. B) have a lower abundance of heavy elements. C) become denser and have a greater abundance of heavy elements. D) become denser and hotter.