What is the current in the 15-? resistor when ? = 9.0 V?
A. 0.20 A
B. 0.30 A
C. 0.10 A
D. 0.26 A
E. 0.60 A
Answer: A
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Light reflects off the surface of Lake Superior. What phase shift does it undergo?
A) 0° B) 90° C) 180° D) 270° E) It does not undergo any phase shift.
Small deviations in a planet's orbital motion:
A) show we don't fully understand gravitational forces yet. B) indicate the presence of an extensive atmosphere. C) indicate the presence of a powerful magnetic field. D) imply the nearby presence of a massive body. E) show the planet's orbit isn't stable.
An object in free fall has
a. a constant speed. b. a constant velocity. c. a velocity that changes 9.8 m/s each second. d. an acceleration that depends on its mass.
An object that is positively charged will
a. repel a rubber rod stroked with fur. b. repel a glass rod stroked with silk. c. be polarized. d. none of these