A series circuit contains a 20-? resistor, a 200-mH inductor, a 10-?F capacitor, and an ac power source. At what frequency should the power source drive the circuit in order to have maximum power transferred from the driving source?
A) 0.11 kHz B) 0.45 kHz C) 0.96 kHz D) 0.17 kHz E) 0.28 kHz
A
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The electric field in the wires of an ac circuit
A) changes via the inverse square law. B) changes direction with time. C) remains relatively constant. D) is nonexistent. E) none of the above
Our best measurements from Earth indicate that the star system Alpha Centauri is 4.2 lightyears away. Suppose some of our astronauts traveled there at a speed v = 0.80c. What would the astronauts measure as the distance to Alpha Centauri?
a. 3.1 lightyears b. 7.0 lightyears c. 8.8 lightyears d. 2.5 lightyears e. 2.7 lightyears
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