The huge sheet of galaxies that spans 70 × 200 Mpc is called the ________
Fill in the blank(s) with correct word
Great Wall
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The Moon has an angular diameter of 0.5°. What is the Moon's angular diameter in minutes of arc?
a. 0.5 b. 30 c. 50 d. 1800 e. 60.5
To create the above spectra, which of the following is NOT true?
a. A dense gas is excited and the light produced is over all wavelengths.
b. A low-density gas is excited and the light produced is over discrete wavelengths.
c. Light from a low-density gas passes through a warm, dense gas and the light that is produced is at all wavelengths except for a few discrete wavelengths.
d. All of the other choices are not true.
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N
The chromosphere of the sun
a. is hotter than the photosphere. b. appears yellow-white in color during total solar eclipse. c. is the visible surface of the sun. d. produces an absorption spectrum. e. all of the above