Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters.
B) the expansion of the universe.
C) very old, red stars in distant galaxies.
D) supermassive black holes.
B
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A __________ has half-integral spin
Fill in the blank(s) with correct word
A light bulb, sold as long-lasting, is rated 95 W at 145 V. The "increased" lifetime comes from using it at 110 V. Assuming negligible change in resistance at the different voltage, what is its power consumption at 110 V?
a. 55 W b. 170 W c. 190 W d. 47 W e. 110 W
A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. When the switch is closed, how long does it take for the current to reach one half of its maximum value?
A. 0.80 s B. 1.6 s C. 2.3 s D. 1.1 s E. 0.55 s