A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The peak current in the circuit is
A. 0.963 A.
B. 10.3 A.
C. 11.0 A.
D. 11.9 A.
E. 29.2 A.
Answer: B
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Meteors are
a) asteroids or comet debris that passes into Earth's atmosphere and burns up b) a group of rocky objects between the orbits of Jupiter and Saturn c) comets that are vaporized when they pass very close to the Sun d) comets that escape the Solar System without being vaporized by the Sun e) a group of rocky objects between the orbits of Mars and Jupiter
A particle is moving with a constant acceleration of 4.0 m/s2 . Its speed at t = 1.0 s is 4.0 m/s and at t = 3.0 s it is 12.0 m/s. What is the area under the position-time graph for the interval from t = 1.0 s to t = 3.0 s?
a. 8.0 m/s b. 8.0 m c. 12 m d. 16 m e. 16 m/s2
Percival Lowell’s claims of a Martian civilization generated great public interest, but other scientists of his time were highly skeptical of these claims. Which two of the following statements (which are all true) explain why other scientists of the late 19th and early 20th centuries rejected Lowell’s claims?
a. Lowell’s canals did not appear in photographs of Mars taken through telescopes. b. Lowell’s canals followed perfectly straight lines for thousands of kilometers. c. Mars has an axis tilt very similar to Earth’s axis tilt. d. Like Earth, Mars has polar ice caps. e. Mars rotates with a period only a little longer than Earth’s rotation period.
What is a Cepheid variable?
A) It is a bright source of variable X-ray emission, thought to harbor a supermassive black hole. B) It is a type of very luminous star that makes an excellent standard candle. C) It is a main-sequence star of spectral type B5. D) It is a type of galaxy that varies in its light output.