Three bulbs have power ratings for use on a 120 volt line: 60 watt, 100 watt and 150 watt. The one with the largest value of resistance has power rating
A. 60 W.
B. 150 W.
C. 100 W.
D. All of these choices have the same resistance
Answer: A
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Quarks are bound together in hadrons by
a. the strong force. b. the weak force. c. intermediate (or gauge) bosons. d. the color force.
_____ is absorbed by a layer of ozone in Earth's atmosphere at an altitude of about 20 mi above Earth's surface
A) Infrared radiation B) Ultraviolet radiation C) Microwave radiation D) X-ray radiation
A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow
a. absorption b. continuous c. emission d. All of the other choices are correct.
A man is moving by you at a speed close to the speed of light. Which of the following correctly summarizes the effects you would notice on his mass, size, and time?
A) His mass would be increased from its value at rest, his length would be decreased from its rest value but only in the direction in which he is moving, and his time would be running slower than yours. B) His mass would be increased from its value at rest, his length, width, and height would all be decreased no matter what direction he is moving, and his time would be running slower than yours. C) His mass would be decreased from its value at rest, his length would be decreased from its rest value but only in the direction in which he is moving, and his time would be running slower than yours. D) His mass would be increased from its value at rest, his size would be increased, and his time would be running slower than yours.