Light travels fastest
A) in a vacuum.
B) through water.
C) through glass.
D) through plastic.
E) through diamond.
A
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What do astronomers mean when they say the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Average distances are increasing between most galaxies. C) Average distances are increasing between most stars. D) The universe is expanding from a single point.
As a spaceship moving toward you at half the speed of light fires a probe toward you, relative to itself at 0.7 the speed of light, you see the probe approaching at about
A) 0.70c. B) 0.87c. C) 0.89c. D) 0.92c. E) 0.96c.
Two resistors of 15 and 30 ? are connected in parallel. If the combination is connected in series with a 9.0-V battery and a 20-? resistor, what is the current through the 15-? resistor?
A) 0.10 A B) 0.13 A C) 0.20 A D) 0.26 A E) 0.32 A
A bulb is designed for 100 W at 130 V rms. What is the power dissipated by this bulb if it is used in a 120 V rms circuit?
A. 169 W B. 130 W C. 100 W D. 85.0 W E. it will blow out