The rotation curve of a galaxy is displayed as a plot of
a) gravity vs. distance to galaxy center
b) rotation velocity vs. distance from Earth
c) period of rotation vs. distance from Earth
d) redshift vs. blueshift
e) rotation velocity vs. distance to galaxy center
Ans: e) rotation velocity vs. distance to galaxy center
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The _______________ formula expresses the relationship of the linear (true) diameter, the angular (apparent) diameter, and the distance, of any object
Fill in the blank(s) with correct word
Light that is shifted toward the color red due to the light passing very near a compact object is called ____________________
Fill in the blank(s) with correct word
What is a typical asteroid made of?
A. solid hydrogen B. liquid water C. solid carbon dioxide and other gases D. rock and iron E. water frozen into ice
Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
a. 10 cm b. 20 cm c. 650 cm d. All of the wavelengths listed above. e. Only the wavelengths listed in (a) and (b).