A 100-W resistance heater is connected to a 110-V dc source. What is the current through the heater?
A) 1.1 A
B) 2.2 A
C) 3.3 A
D) 4.4 A
E) 0.91 A
E
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In the context of giant stars, helium fusion produces _____ that accumulate in an inert core
A) nitrogen and carbon B) hydrogen and neon C) oxygen and neon D) carbon and oxygen
Which of the following kinds of stars is most dense?
a. a supergiant star b. a main sequence star c. a giant star d. a white dwarf e. the sun
In a double slit experiment, the intensity of light at the center of the central bright fringe is measured to be 6.2 µW/m2
What is the intensity halfway between the center of this fringe and the first dark band, assuming that the small-angle approximation is valid? A) 6.2 µW/m2 B) 3.1 µW/m2 C) 4.7 µW/m2 D) 1.6 µW/m2 E) 0.12 µW/m2
The impact of meteorites on the Moon has caused
a. craters only. b. rays only. c. rills only. d. both rays and craters.