The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A) 2.0 B) 1.7 C) 0.87 D) 1.2
D
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Thin Lenses: Which statement about a single thin lens is correct?
A. A converging lens always produces a real inverted image. B. A diverging lens always produces a virtual inverted image. C. A converging lens sometimes produces a real upright image. D. A diverging lens always produces a virtual upright image. E. A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point.
If a spinning object's radius shrinks by a factor of 5, its rotation velocity will
A. get 10 times faster. B. get five times slower. C. get five times faster. D. get 25 times faster. E. remain the same.
Since radiation interacts with matter in individual particle-like impacts called photons, why does light seem continuous to us?
A) Each photon is spread out over a large region of space and these regions overlap each other. B) Because there are so many photons in a light beam and each carries such a small amount of energy. C) Each photon has a very wide range of energies, and these energy ranges overlap each other. D) Because of the way that the photons interact with each other. E) Because there are so few photons in a light beam and because they each carry such a large amount of energy.
The charge flowing through a light bulb attached to a 12.0-V battery in 13.0 s is 30.0 C. What is the average power supplied by the battery during this process?
a. 360 W b. 12.0 W c. 27.7 W d. 5.20 W e. 30.0 W