At a certain time, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A) 280
B) 28
C) 2800
D) 2.8
E) 0.28
A
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Which of the following statements about brown dwarfs is not true?
A) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature. B) Brown dwarfs eventually collapse to become white dwarfs. C) All brown dwarfs have masses less than about 8% that of our Sun. D) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores.
A triangle has sides of length 7 cm and 11 cm. If the triangle is a right triangle, which of the following could be the length of the third side, to the nearest centimeter?
a. 11 cm b. 8 cm c. 16 cm d. 17 cm e. 7 cm
Which of the following is not a derived quantity?
a. Volume b. Speed c. Mass d. Density
Thermonuclear warheads, or hydrogen bombs, are powerful mainly because of the
a. fission process. b. fusion process. c. absorption of neutrons by 238U. d. emission of protons by 238U.