The Milky Way Galaxy is
a. a spiral galaxy.
b. part of a cluster of galaxies that contains a few dozen galaxies.
c. about 80,000 light years in diameter.
d. all of the above.
D
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Compared to yesterday, you did 3 times the work in one-third the time. To do so, your power output must have been
A) the same as yesterday's power output. B) one-third of yesterday's power output. C) 3 times yesterday's power output. D) 9 times yesterday's power output. E) 34 times yesterday's power output.
Susan Solomon led the scientific expedition that
A) measured the rate of temperature increase at isolated places on earth, such as the north pole and the Gobi desert. B) studied the problem of ozone depletion over Antarctica. C) measured the carbon-dioxide content of the atmosphere at many places on Earth. D) measured the ozone content of the upper atmosphere at many places above the surface of the earth. E) studied in detail the atmospheric effects (especially carbon-dioxide injections) of large active volcanoes.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians
Contrast S and P waves in terms of speed and transmission through the interior
What will be an ideal response?