Most of the Rocky Mountains, in the western United States, lie in the ______________ Standard Time zone
a. Mountain
b. Eastern
c. Central
d. Pacific
a
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A 5.00 kg mass is located at (2.00 m, 0.00 m, 3.00 m) and a 2.00 kg mass is located at (0.00 m, 4.00 m, –2.00 m). The center of gravity of the system of masses is
A. (10/7m, 8/7m, 11/7m). B. (11/7m, 7/7m, 8/7m). C. (7/7m, 10/7m, 11/7m). D. (10/7m, 7/7m, 8/7m). E. (8/7m, 7/7m, 10/7m).
How do astronomers infer the presence of magnetic fields in molecular clouds?
A) by measuring the amount of interstellar reddening B) by measuring the Doppler shifts of emission lines from gas clumps in the cloud C) by measuring the infrared light emitted by the cloud D) by measuring the polarization of starlight passing through the cloud E) by measuring the amount by which gravity is reduced
The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________
Fill in the blank(s) with correct word
If y = 0.02 sin (30x ? 400t) (SI units), the velocity of the wave is
a. 3/40 m/s. b. 40/3 m/s. c. 60?/400 m/s. d. 400/60? m/s. e. 400 m/s.