A sound level of 80 dB has twenty times the amplitude of a 60 dB sound
Indicate whether the statement is true or false
F
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Dust and gas in the Milky Way
A. are concentrated in a thin layer in the disk. B. are found in different places: dust primarily in the disk and gas primarily in the halo. C. are spread evenly throughout the halo and disk. D. are found in different places: gas primarily in the disk and dust primarily in the halo.
In calculating the lateral magnification from a lens, a negative result means
A) the image is larger than the object. B) the image is smaller than the object. C) the image is directed downward. D) the image is inverted. E) the calculation is incorrect.
Determine the energy stored in the 60-?F capacitor
a.
2.4 mJ
b.
3.0 mJ
c.
3.6 mJ
d.
4.3 mJ
e.
6.0 mJ
The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
a. The universe is expanding. b. Galaxies repel each other like magnets. c. Our galaxy lies near the center of the universe.