Why is it difficult to use the method of standard candles to find the distance to galaxies?
A. There are no known standard candles outside of our galaxy.
B. Standard candles are too bright to be used for all but the farthest galaxies.
C. It is difficult to isolate the light of a single star from the galaxy.
D. All of these choices are correct.
Answer: C
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Which of the following is a unit-vector?
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What is the current flowing through the 2-? resistor?
a.
2 A
b.
3 A
c.
4 A
d.
6 A
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