One ray that is useful in locating the image formed by a convex mirror is the ray that is incident on the mirror in a path directed toward the focal point. This ray is reflected
A. through the center of curvature.
B. directly back along its incident path.
C. on a path tangent to the mirror.
D. on a path parallel to the mirror axis.
Answer: D
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This painting shows a futuristic spacecraft powered by the detonation of small hydrogen bombs. If we actually had such a spacecraft, what would it allow us to do?
A) It would allow us to make a one-way trip to the nearest star besides the Sun in about a century. B) It would allow us to travel roundtrip to almost anywhere in the Milky Way Galaxy in just a few years of ship time. C) It would allow us to travel from Earth to Mars in less than an hour. D) It would allow us to travel up to several times faster than the speed of light.
In the context of Uranus's rings, the passage of the planet in front of a star is referred to as a(n) _____
A) ablation B) blueshift C) occultation D) fasciculation
You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph?
A) The force of friction needs to be four times as large. B) The force of friction needs to be twice as large. C) the force of friction is the same for both speeds since the radius of curvature is the same. D) None of the above
Potassium-40, one of the six major radionuclides used for radiometric dating, decays to
a. nitrogen. b. strontium. c. lead. d. argon.