The 120°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific
b. Mountain
c. Eastern
d. Central
a
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The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did these elements come from?
A) They were produced by gravity in the solar nebula as it collapsed. B) They were produced by stars that lived and died before our solar system was born. C) They have been present in the universe since its birth. D) They were made by chemical reactions in interstellar gas.
For a wave with a constant speed, the smaller the period, the ______________ its wavelength
Fill in the blank(s) with correct word
The number of quarks in a deuteron (2H) is
A) 1. B) 2. C) 3. D) 4. E) 6.
In a thundercloud there may be an electric charge of +40 C near the top of the cloud and -40 C near the bottom of the cloud. These charges are separated by about 2.0 km. What is the electric force between these two sets of charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 3.6 × 10^6 N c. 3.6 × 10^7 N b. 3.6 × 10^4 N d. 3.6 × 10^5 N