A 120-V rms voltage at 60.0 Hz is applied across a capacitor and a 100-? resistor. If the impedance of this circuit is 200 ?, what is the average power of this circuit?

A) 278 W
B) 72.0 W
C) 36.0 W
D) 100 W
E) 200 W


C

Physics & Space Science

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The force required to move a 50.0 kg object in a circle with radius 55.0 m at a constant speed of 2.60 m/s is

a. 0.0 N b. 6.1 N c. 0.12 N d. 2.36 N

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The brightest main-sequence star in a cluster has a surface temperature of 10,000 K and a luminosity of about 10 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?

A) 107 years B) 109 years C) 1011 years D) 1013 years

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It's the June solstice, the Sun is at your zenith, and you have a UT clock that tells you it is midnight in Greenwich, England. Where are you?

A) on the Tropic of Cancer near the International Date Line B) on the equator near the International Date Line C) on the Tropic of Cancer, due south of Greenwich, England D) at latitude 25°S and longitude 49°E

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To avoid confusion, cosmologists use the term ice to mean only frozen water; other frozen gases are called plasma.

a. true b. false

Physics & Space Science