What is an artificial star?
A) a meteor
B) the unseen member of a binary star system
C) a satellite orbiting Earth
D) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations
E) a possible source of dark matter in the universe
D
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Two-Source Interference of Sound: A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person perceive?
A. constructive B. destructive C. both constructive and destructive D. neither constructive nor destructive
Which of the following is most like the rotation of stars in the disk of the Milky Way?
A) a DVD in a player B) the planets in our solar system C) cars moving at a constant speed on a circular race track D) the hands of an analog clock E) the tire of a car moving
A step-up transformer has an input voltage of 110 V (rms). There are 100 turns on the primary and 1500 on the secondary. What is the output voltage?
a. 1600 V (max) b. 1650 V (rms) c. 3260 V (max) d. 165 kV (rms) e. 7.3 V (rms)
All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.