A series circuit consists of ac source, a 90-? resistor, a 0.80-H inductor, and an 80-?F capacitor
The frequency of the source is adjusted so that the capacitive reactance is equal to twice the inductive reactance. What is the frequency of the source?
A) 14 Hz
B) 13 Hz
C) 16 Hz
D) 17 Hz
E) 19 Hz
A
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The amount of 
Ar is one-ninth the amount of 
K. If the half-life of the latter is T, what is the rock’s age?
A. T B. T/9 C. 9T D. ln(9T) E. T/ln 9 F. Some other result (specify)
The gravitational force between two very large metal spheres in outer space is 200 N. How large would this force be if the mass of each sphere were cut in half?
A. 12.5 N B. 50 N C. 100 N D. 200 N
The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them
A) also doubles. B) strengthens by a factor of 4. C) weakens by a factor of 4. D) weakens by a factor of 2. E) is unaffected.
If we are optimistic in our assumptions about the development of life and intelligence, then the number of technological civilizations currently in the galaxy should equal the
A) average lifetime of a civilization. B) number of stars in the galaxy's habitable zone. C) average number of planets per star. D) number of stars forming per year. E) average number of planets that produce life.