The primary coil of a transformer has 600 turns and its secondary coil has 150 turns. If the ac current in the primary coil is 2 A, what is the current in its secondary coil?
A) 8 A
B) 1/2 A
C) 1/4 A
D) 2 A
E) 4 A
A
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Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much _______ itself
a. infrared radiation b. radio waves c. X-rays d. gamma rays e. all of the above
How does the mass of the products of a nuclear fusion reaction compare to the mass of the original elements?
A) The mass of the products is less than the mass of the original elements. B) The mass of the products is greater than the mass of the original elements. C) The mass of the products is unrelated to the mass of the original elements. D) The mass of the products is equal to the mass of the original elements.
Complete this sentence: The Sun, Earth, Jupiter, and Saturn's icy moons are all very different environments, ________.
A. but their differences are only because of where each currently is in the Solar System B. but all formed from the same basic group of chemicals C. the result of each type of object forming from different interstellar clouds D. but their differences are because each contains very different chemicals
If two electrons are near each other and are moving past each other, the electromagnetic forces they exert on each other will be
A) magnetic but not electric. B) electric but not magnetic. C) zero. D) both electric and magnetic.